Chemistry:Supramolecular chemistry

From HandWiki
Revision as of 10:09, 8 February 2024 by Jslovo (talk | contribs) (over-write)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Short description: Branch of chemistry

Supramolecular chemistry refers to the branch of chemistry concerning chemical systems composed of a discrete number of molecules. The strength of the forces responsible for spatial organization of the system range from weak intermolecular forces, electrostatic charge, or hydrogen bonding to strong covalent bonding, provided that the electronic coupling strength remains small relative to the energy parameters of the component.[1][2][page needed] While traditional chemistry concentrates on the covalent bond, supramolecular chemistry examines the weaker and reversible non-covalent interactions between molecules.[3] These forces include hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, pi–pi interactions and electrostatic effects.[4]

Important concepts advanced by supramolecular chemistry include molecular self-assembly, molecular folding, molecular recognition, host–guest chemistry, mechanically-interlocked molecular architectures, and dynamic covalent chemistry.[5] The study of non-covalent interactions is crucial to understanding many biological processes that rely on these forces for structure and function. Biological systems are often the inspiration for supramolecular research.

Gallery

History

The existence of intermolecular forces was first postulated by Johannes Diderik van der Waals in 1873. However, Nobel laureate Hermann Emil Fischer developed supramolecular chemistry's philosophical roots. In 1894,[13] Fischer suggested that enzyme–substrate interactions take the form of a "lock and key", the fundamental principles of molecular recognition and host–guest chemistry. In the early twentieth century non-covalent bonds were understood in gradually more detail, with the hydrogen bond being described by Latimer and Rodebush in 1920.

The use of these principles led to an increasing understanding of protein structure and other biological processes. For instance, the important breakthrough that allowed the elucidation of the double helical structure of DNA occurred when it was realized that there are two separate strands of nucleotides connected through hydrogen bonds. The use of non-covalent bonds is essential to replication because they allow the strands to be separated and used to template new double stranded DNA. Concomitantly, chemists began to recognize and study synthetic structures based on non-covalent interactions, such as micelles and microemulsions.

Eventually, chemists were able to take these concepts and apply them to synthetic systems. The breakthrough came in the 1960s with the synthesis of the crown ethers by Charles J. Pedersen. Following this work, other researchers such as Donald J. Cram, Jean-Marie Lehn and Fritz Vögtle became active in synthesizing shape- and ion-selective receptors, and throughout the 1980s research in the area gathered a rapid pace with concepts such as mechanically interlocked molecular architectures emerging.

The importance of supramolecular chemistry was established by the 1987 Nobel Prize for Chemistry which was awarded to Donald J. Cram, Jean-Marie Lehn, and Charles J. Pedersen in recognition of their work in this area.[14] The development of selective "host–guest" complexes in particular, in which a host molecule recognizes and selectively binds a certain guest, was cited as an important contribution.

In the 1990s, supramolecular chemistry became even more sophisticated, with researchers such as James Fraser Stoddart developing molecular machinery and highly complex self-assembled structures, and Itamar Willner developing sensors and methods of electronic and biological interfacing. During this period, electrochemical and photochemical motifs became integrated into supramolecular systems in order to increase functionality, research into synthetic self-replicating system began, and work on molecular information processing devices began. The emerging science of nanotechnology also had a strong influence on the subject, with building blocks such as fullerenes, nanoparticles, and dendrimers becoming involved in synthetic systems.

Control

Thermodynamics

Supramolecular complexes are formed by non-covalent interactions between two chemical moieties, which can be described as an host and a guest. Most commonly, the interacting species are held together by hydrogen bonds. The definition excludes compounds formed by electrostatic interactions, which are called ion pairs.

In solution, the host H, guest G, and complexes HpGq, will be in equilibrium with each other. In the simplest case, p=q=1, the equilibrium can be written as

[math]\displaystyle{ H + G \leftrightharpoons HG }[/math]

The value of the equilibrium constant, K, for this reaction can, in principle, be determined by any of the techniques described below. Some examples are shown in the following table.[15]

Log K1,1 values for complexes of medicinal interest in methanol at 25 °C
Li+ Na+ K+ Rb+ Cs+
Valinomycin <0.7 0.67 4.9 5.26 4.42
Enniatin 1.28 2.42 2.92 2.24 2.34
Nigericin - 4.7 5.6 5.0 -
Monensin 3.6 6.5 5.0 4.3 3.6

The Gibbs free energy change, [math]\displaystyle{ \Delta G }[/math], for this reaction is the sum of an enthalpy term, [math]\displaystyle{ \Delta H }[/math] and an entropy term [math]\displaystyle{ T\Delta S }[/math].

[math]\displaystyle{ \Delta G = \Delta H -T\Delta S }[/math]

Both [math]\displaystyle{ \Delta G }[/math] and [math]\displaystyle{ \Delta S }[/math] values can be determined at a given temperature, [math]\displaystyle{ T }[/math], by means of Isothermal titration calorimetry. For an example, see Sessler. et.al.[16] In that example a macrocyclic ring with 4 protonated nitrogen atoms encapsulates a chloride anion; illustrations of ITC data and a titration curve are reproduced in Steed&Atwood.[15] (pp 15–16) The value of the equilibrium constant and the stoichiometry of the species formed were found to be strongly solvent-dependent. With nitromethane solutions values of ΔH = 8.55 kJmol−1 and ΔS = -9.1 JK−1mol−1 were obtained.

Environment

The molecular environment around a supramolecular system is also of prime importance to its operation and stability. Many solvents have strong hydrogen bonding, electrostatic, and charge-transfer capabilities, and are therefore able to become involved in complex equilibria with the system, even breaking complexes completely. For this reason, the choice of solvent can be critical.

Concepts

A ribosome is a biological machine that uses protein dynamics on nanoscales

Molecular self-assembly

Molecular self-assembly is the construction of systems without guidance or management from an outside source (other than to provide a suitable environment). The molecules are directed to assemble through non-covalent interactions. Self-assembly may be subdivided into intermolecular self-assembly (to form a supramolecular assembly), and intramolecular self-assembly (or folding as demonstrated by foldamers and polypeptides). Molecular self-assembly also allows the construction of larger structures such as micelles, membranes, vesicles, liquid crystals, and is important to crystal engineering.[17]

Molecular recognition and complexation

Molecular recognition is the specific binding of a guest molecule to a complementary host molecule to form a host–guest complex. Often, the definition of which species is the "host" and which is the "guest" is arbitrary. The molecules are able to identify each other using non-covalent interactions. Key applications of this field are the construction of molecular sensors and catalysis.[18][19][20][21]

Template-directed synthesis

Molecular recognition and self-assembly may be used with reactive species in order to pre-organize a system for a chemical reaction (to form one or more covalent bonds). It may be considered a special case of supramolecular catalysis. Non-covalent bonds between the reactants and a "template" hold the reactive sites of the reactants close together, facilitating the desired chemistry. This technique is particularly useful for situations where the desired reaction conformation is thermodynamically or kinetically unlikely, such as in the preparation of large macrocycles. This pre-organization also serves purposes such as minimizing side reactions, lowering the activation energy of the reaction, and producing desired stereochemistry. After the reaction has taken place, the template may remain in place, be forcibly removed, or may be "automatically" decomplexed on account of the different recognition properties of the reaction product. The template may be as simple as a single metal ion or may be extremely complex.[citation needed]

Mechanically interlocked molecular architectures

Mechanically interlocked molecular architectures consist of molecules that are linked only as a consequence of their topology. Some non-covalent interactions may exist between the different components (often those that were used in the construction of the system), but covalent bonds do not. Supramolecular chemistry, and template-directed synthesis in particular, is key to the efficient synthesis of the compounds. Examples of mechanically interlocked molecular architectures include catenanes, rotaxanes, molecular knots, molecular Borromean rings[22] and ravels.[23]

Dynamic covalent chemistry

In dynamic covalent chemistry covalent bonds are broken and formed in a reversible reaction under thermodynamic control. While covalent bonds are key to the process, the system is directed by non-covalent forces to form the lowest energy structures.[24]

Biomimetics

Many synthetic supramolecular systems are designed to copy functions of biological systems. These biomimetic architectures can be used to learn about both the biological model and the synthetic implementation. Examples include photoelectrochemical systems, catalytic systems, protein design and self-replication.[25]

Imprinting

Molecular imprinting describes a process by which a host is constructed from small molecules using a suitable molecular species as a template. After construction, the template is removed leaving only the host. The template for host construction may be subtly different from the guest that the finished host binds to. In its simplest form, imprinting uses only steric interactions, but more complex systems also incorporate hydrogen bonding and other interactions to improve binding strength and specificity.[26]

Molecular machinery

Molecular machines are molecules or molecular assemblies that can perform functions such as linear or rotational movement, switching, and entrapment. These devices exist at the boundary between supramolecular chemistry and nanotechnology, and prototypes have been demonstrated using supramolecular concepts.[27] Jean-Pierre Sauvage, Sir J. Fraser Stoddart and Bernard L. Feringa shared the 2016 Nobel Prize in Chemistry for the 'design and synthesis of molecular machines'.[28]

Building blocks

Supramolecular systems are rarely designed from first principles. Rather, chemists have a range of well-studied structural and functional building blocks that they are able to use to build up larger functional architectures. Many of these exist as whole families of similar units, from which the analog with the exact desired properties can be chosen.

Synthetic recognition motifs

Macrocycles

Macrocycles are very useful in supramolecular chemistry, as they provide whole cavities that can completely surround guest molecules and may be chemically modified to fine-tune their properties.

  • Cyclodextrins, calixarenes, cucurbiturils and crown ethers are readily synthesized in large quantities, and are therefore convenient for use in supramolecular systems.
  • More complex cyclophanes, and cryptands can be synthesised to provide more tailored recognition properties.
  • Supramolecular metallocycles are macrocyclic aggregates with metal ions in the ring, often formed from angular and linear modules.[29] Common metallocycle shapes in these types of applications include triangles, squares, and pentagons, each bearing functional groups that connect the pieces via "self-assembly."[30]
  • Metallacrowns are metallomacrocycles generated via a similar self-assembly approach from fused chelate-rings.

Structural units

Many supramolecular systems require their components to have suitable spacing and conformations relative to each other, and therefore easily employed structural units are required.[31]

  • Commonly used spacers and connecting groups include polyether chains, biphenyls and triphenyls, and simple alkyl chains. The chemistry for creating and connecting these units is very well understood.
  • nanoparticles, nanorods, fullerenes and dendrimers offer nanometer-sized structure and encapsulation units.
  • Surfaces can be used as scaffolds for the construction of complex systems and also for interfacing electrochemical systems with electrodes. Regular surfaces can be used for the construction of self-assembled monolayers and multilayers.
  • The understanding of intermolecular interactions in solids has undergone a major renaissance via inputs from different experimental and computational methods in the last decade. This includes high-pressure studies in solids and "in situ" crystallization of compounds which are liquids at room temperature along with the use of electron density analysis, crystal structure prediction and DFT calculations in solid state to enable a quantitative understanding of the nature, energetics and topological properties associated with such interactions in crystals.[32]

Photo-chemically and electro-chemically active units

Biologically-derived units

  • The extremely strong complexation between avidin and biotin is instrumental in blood clotting, and has been used as the recognition motif to construct synthetic systems.
  • The binding of enzymes with their cofactors has been used as a route to produce modified enzymes, electrically contacted enzymes, and even photoswitchable enzymes.
  • DNA has been used both as a structural and as a functional unit in synthetic supramolecular systems.

Applications

Materials technology

Supramolecular chemistry has found many applications,[33] in particular molecular self-assembly processes have been applied to the development of new materials. Large structures can be readily accessed using bottom-up synthesis as they are composed of small molecules requiring fewer steps to synthesize. Thus most of the bottom-up approaches to nanotechnology are based on supramolecular chemistry.[34] Many smart materials[35] are based on molecular recognition.[36]

Catalysis

Main page: Chemistry:Supramolecular catalysis

A major application of supramolecular chemistry is the design and understanding of catalysts and catalysis. Non-covalent interactions are extremely important in catalysis, binding reactants into conformations suitable for reaction and lowering the transition state energy of reaction. Template-directed synthesis is a special case of supramolecular catalysis. Encapsulation systems such as micelles, dendrimers, and cavitands[37] are also used in catalysis to create microenvironments suitable for reactions (or steps in reactions) to progress that is not possible to use on a macroscopic scale.

Medicine

Design based on supramolecular chemistry has led to numerous applications in the creation of functional biomaterials and therapeutics.[38] Supramolecular biomaterials afford a number of modular and generalizable platforms with tunable mechanical, chemical and biological properties. These include systems based on supramolecular assembly of peptides, host–guest macrocycles, high-affinity hydrogen bonding, and metal–ligand interactions.

A supramolecular approach has been used extensively to create artificial ion channels for the transport of sodium and potassium ions into and out of cells.[39]

Supramolecular chemistry is also important to the development of new pharmaceutical therapies by understanding the interactions at a drug binding site. The area of drug delivery has also made critical advances as a result of supramolecular chemistry providing encapsulation and targeted release mechanisms.[40] In addition, supramolecular systems have been designed to disrupt protein–protein interactions that are important to cellular function.[41]

Data storage and processing

Supramolecular chemistry has been used to demonstrate computation functions on a molecular scale. In many cases, photonic or chemical signals have been used in these components, but electrical interfacing of these units has also been shown by supramolecular signal transduction devices. Data storage has been accomplished by the use of molecular switches with photochromic and photoisomerizable units, by electrochromic and redox-switchable units, and even by molecular motion. Synthetic molecular logic gates have been demonstrated on a conceptual level. Even full-scale computations have been achieved by semi-synthetic DNA computers.

See also

References

  1. ↑ Lehn, J. (1993). "Supramolecular Chemistry". Science 260 (5115): 1762–23. doi:10.1126/science.8511582. PMID 8511582. Bibcode: 1993Sci...260.1762L. 
  2. ↑ Lehn, J. (1995). Supramolecular Chemistry. Wiley-VCH. ISBN 978-3-527-29311-7. 
  3. ↑ Schneider, H. (2009). "Binding Mechanisms in Supramolecular Complexes". Angew. Chem. Int. Ed. Engl. 48 (22): 3924–77. doi:10.1002/anie.200802947. PMID 19415701. 
  4. ↑ Biedermann, F.; Schneider, H.J. (2016). "Experimental Binding Energies in Supramolecular Complexes". Chem. Rev. 116 (9): 5216–5300. doi:10.1021/acs.chemrev.5b00583. PMID 27136957. 
  5. ↑ Oshovsky, G. V.; Reinhoudt, D. N.; Verboom, W. (2007). "Supramolecular Chemistry in Water". Angewandte Chemie International Edition 46 (14): 2366–93. doi:10.1002/anie.200602815. PMID 17370285. https://ris.utwente.nl/ws/files/6610143/Oshovsky07supra.pdf. 
  6. ↑ Hasenknopf, B.; Lehn, J. M.; Kneisel, B. O.; Baum, G.; Fenske, D. (1996). "Self-Assembly of a Circular Double Helicate". Angewandte Chemie International Edition in English 35 (16): 1838–1840. doi:10.1002/anie.199618381. 
  7. ↑ Day, A. I.; Blanch, R. J.; Arnold, A. P.; Lorenzo, S.; Lewis, G. R.; Dance, I. (2002). "A Cucurbituril-Based Gyroscane: A New Supramolecular Form". Angewandte Chemie International Edition 41 (2): 275–7. doi:10.1002/1521-3773(20020118)41:2<275::AID-ANIE275>3.0.CO;2-M. PMID 12491407. 
  8. ↑ Bravo, J. A.; Raymo, F. I. M.; Stoddart, J. F.; White, A. J. P.; Williams, D. J. (1998). "High Yielding Template-Directed Syntheses of [2]Rotaxanes". European Journal of Organic Chemistry 1998 (11): 2565–2571. doi:10.1002/(SICI)1099-0690(199811)1998:11<2565::AID-EJOC2565>3.0.CO;2-8. 
  9. ↑ Anderson, S.; Anderson, H. L.; Bashall, A.; McPartlin, M.; Sanders, J. K. M. (1995). "Assembly and Crystal Structure of a Photoactive Array of Five Porphyrins". Angewandte Chemie International Edition in English 34 (10): 1096–1099. doi:10.1002/anie.199510961. 
  10. ↑ Freeman, W. A. (1984). "Structures of the p-xylylenediammonium chloride and calcium hydrogensulfate adducts of the cavitand 'cucurbituril', C36H36N24O12". Acta Crystallographica Section B 40 (4): 382–387. doi:10.1107/S0108768184002354. 
  11. ↑ Schmitt, J. L.; Stadler, A. M.; Kyritsakas, N.; Lehn, J. M. (2003). "Helicity-Encoded Molecular Strands: Efficient Access by the Hydrazone Route and Structural Features". Helvetica Chimica Acta 86 (5): 1598–1624. doi:10.1002/hlca.200390137. 
  12. ↑ Janeta, Mateusz; John, Łukasz; Ejfler, Jolanta; Lis, Tadeusz; Szafert, Sławomir (2016-08-02). "Multifunctional imine-POSS as uncommon 3D nanobuilding blocks for supramolecular hybrid materials: synthesis, structural characterization, and properties". Dalton Transactions 45 (31): 12312–12321. doi:10.1039/C6DT02134D. ISSN 1477-9234. PMID 27438046. 
  13. ↑ Fischer, E. (1894). "Einfluss der Configuration auf die Wirkung der Enzyme". Berichte der Deutschen Chemischen Gesellschaft 27 (3): 2985–2993. doi:10.1002/cber.18940270364. https://zenodo.org/record/1425780. 
  14. ↑ Schmeck, Harold M. Jr. (October 15, 1987) "Chemistry and Physics Nobels Hail Discoveries on Life and Superconductors; Three Share Prize for Synthesis of Vital Enzymes". New York Times
  15. ↑ 15.0 15.1 Steed, Jonathan W.; Atwood, Jerry L. (2009). Supramolecular Chemistry (2nd ed.). Wiley. doi:10.1002/9780470740880. ISBN 978-0-470-51234-0. 
  16. ↑ Sessler, Jonathan L.; Gross, Dustin E.; Cho, Won-Seob; Lynch, Vincent M.; Schmidtchen, Franz P.; Bates, Gareth W.; Light, Mark E.; Gale, Philip A. (2006). "Calix[4pyrrole as a Chloride Anion Receptor: Solvent and Countercation Effects"]. J. Am. Chem. Soc. 128 (37): 12281–12288. doi:10.1021/ja064012h. PMID 16967979. 
  17. ↑ Ariga, K.; Hill, J. P.; Lee, M. V.; Vinu, A.; Charvet, R.; Acharya, S. (2008). "Challenges and breakthroughs in recent research on self-assembly". Science and Technology of Advanced Materials 9 (1): 014109. doi:10.1088/1468-6996/9/1/014109. PMID 27877935. Bibcode: 2008STAdM...9a4109A.  open access
  18. ↑ Kurth, D. G. (2008). "Metallo-supramolecular modules as a paradigm for materials science". Science and Technology of Advanced Materials 9 (1): 014103. doi:10.1088/1468-6996/9/1/014103. PMID 27877929. Bibcode: 2008STAdM...9a4103G.  open access
  19. ↑ Daze, K. (2012). "Supramolecular hosts that recognize methyllysines and disrupt the interaction between a modified histone tail and its epigenetic reader protein". Chemical Science 3 (9): 2695. doi:10.1039/C2SC20583A. 
  20. ↑ Bureekaew, S.; Shimomura, S.; Kitagawa, S. (2008). "Chemistry and application of flexible porous coordination polymers". Science and Technology of Advanced Materials 9 (1): 014108. doi:10.1088/1468-6996/9/1/014108. PMID 27877934. Bibcode: 2008STAdM...9a4108B.  open access
  21. ↑ Lehn, J. M. (1990). "Perspectives in Supramolecular Chemistry—From Molecular Recognition towards Molecular Information Processing and Self-Organization". Angewandte Chemie International Edition in English 29 (11): 1304–1319. doi:10.1002/anie.199013041. 
  22. ↑ Ikeda, T.; Stoddart, J. F. (2008). "Electrochromic materials using mechanically interlocked molecules". Science and Technology of Advanced Materials 9 (1): 014104. doi:10.1088/1468-6996/9/1/014104. PMID 27877930. Bibcode: 2008STAdM...9a4104I.  open access
  23. ↑ Li, F.; Clegg, J. K.; Lindoy, L. F.; MacQuart, R. B.; Meehan, G. V. (2011). "Metallosupramolecular self-assembly of a universal 3-ravel". Nature Communications 2: 205. doi:10.1038/ncomms1208. PMID 21343923. Bibcode: 2011NatCo...2..205L. 
  24. ↑ Rowan, S. J.; Cantrill, S. J.; Cousins, G. R. L.; Sanders, J. K. M.; Stoddart, J. F. (2002). "Dynamic Covalent Chemistry". Angewandte Chemie International Edition 41 (6): 898–952. doi:10.1002/1521-3773(20020315)41:6<898::AID-ANIE898>3.0.CO;2-E. PMID 12491278. 
  25. ↑ Zhang, S. (2003). "Fabrication of novel biomaterials through molecular self-assembly". Nature Biotechnology 21 (10): 1171–8. doi:10.1038/nbt874. PMID 14520402. 
  26. ↑ Dickert, F. (1999). "Molecular imprinting in chemical sensing". TrAC Trends in Analytical Chemistry 18 (3): 192–199. doi:10.1016/S0165-9936(98)00123-X. 
  27. ↑ Balzani, V.; Gómez-López, M.; Stoddart, J. F. (1998). "Molecular Machines". Accounts of Chemical Research 31 (7): 405–414. doi:10.1021/ar970340y. 
  28. ↑ "The Nobel Prize in Chemistry 2016". Nobel Media AB 2014. https://www.nobelprize.org/nobel_prizes/chemistry/laureates/2016/. 
  29. ↑ Functional Metallosupramolecular Materials, Editors: John George Hardy, Felix H Schacher, Royal Society of Chemistry, Cambridge 2015, https://pubs.rsc.org/en/content/ebook/978-1-78262-267-3
  30. ↑ Lee, S. J.; Lin, W. (2008). "Chiral Metallocycles: Rational Synthesis and Novel Applications". Accounts of Chemical Research 41 (4): 521–37. doi:10.1021/ar700216n. PMID 18271561. 
  31. ↑ Atwood, J. L.; Gokel, George W.; Barbour, Leonard J. (2017-06-22). Comprehensive Supramolecular Chemistry II. Amsterdam, Netherlands. p. 46. ISBN 9780128031995. OCLC 992802408. 
  32. ↑ Chopra, Deepak, Royal Society of Chemistry (2019) (in English). Understanding intermolecular interactions in the solid state: approaches and techniques. London; Cambridge: Royal Society of Chemistry. ISBN 978-1-78801-079-5. OCLC 1103809341. https://www.worldcat.org/oclc/1103809341. 
  33. ↑ Schneider, H.-J. ( Ed.) (2012) Applications of Supramolecular Chemistry, CRC Press Taylor & Francis Boca Raton etc, [1]
  34. ↑ Gale, P.A. and Steed, J.W. (eds.) (2012) Supramolecular Chemistry: From Molecules to Nanomaterials. Wiley. ISBN:978-0-470-74640-0
  35. ↑ Smart Materials Book Series, Royal Soc. Chem. Cambridge UK . http://pubs.rsc.org/bookshop/collections/series?issn=2046-0066
  36. ↑ Chemoresponsive Materials /Stimulation by Chemical and Biological Signals, Schneider, H.-J. ; Ed:, (2015) The Royal Society of Chemistry, Cambridge https://dx.doi.org/10.1039/9781782622420
  37. ↑ Choudhury, R. (2012). "Deep-Cavity Cavitand Octa Acid as a Hydrogen Donor: Photofunctionalization with Nitrenes Generated from Azidoadamantanes". The Journal of Organic Chemistry 78 (5): 1824–1832. doi:10.1021/jo301499t. PMID 22931185. 
  38. ↑ Webber, Matthew J.; Appel, Eric A.; Meijer, E. W.; Langer, Robert (18 December 2015). "Supramolecular biomaterials". Nature Materials 15 (1): 13–26. doi:10.1038/nmat4474. PMID 26681596. Bibcode: 2016NatMa..15...13W. 
  39. ↑ Rodríguez-Vázquez, Nuria; Fuertes, Alberto; Amorín, Manuel; Granja, Juan R. (2016). "Chapter 14. Bioinspired Artificial Sodium and Potassium Ion Channels". in Sigel, Astrid; Sigel, Helmut; Sigel, Roland K.O.. The Alkali Metal Ions: Their Role in Life. Metal Ions in Life Sciences. 16. Springer. pp. 485–556. doi:10.1007/978-3-319-21756-7_14. 
  40. ↑ Smart Materials for Drug Delivery: Complete Set (2013) Royal Soc. Chem. Cambridge UK http://pubs.rsc.org/en/content/ebook/9781849735520
  41. ↑ Bertrand, N.; Gauthier, M. A.; Bouvet, C. L.; Moreau, P.; Petitjean, A.; Leroux, J. C.; Leblond, J. (2011). "New pharmaceutical applications for macromolecular binders". Journal of Controlled Release 155 (2): 200–10. doi:10.1016/j.jconrel.2011.04.027. PMID 21571017. https://hal.archives-ouvertes.fr/hal-02512499/file/1-s2.0-S0168365911002422-main.pdf. 

External links



Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Supramolecular_chemistry&oldid=3423088"