Chemistry:Trans-Dichlorodiammineplatinum(II)
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| Other names
Reiset's second chloride, transplatin
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3D model (JSmol)
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PubChem CID
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| Properties | |
| Cl2H6N2Pt | |
| Molar mass | 300.05 g·mol−1 |
| Appearance | yellow solid |
| low | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
trans-Dichlorodiammineplatinum(II) is the trans isomer of the coordination complex with the formula trans-PtCl2(NH3)2, sometimes called transplatin.[1] It is a yellow solid with low solubility in water but good solubility in DMF. The existence of two isomers of PtCl2(NH3)2 led Alfred Werner to propose square planar molecular geometry.[2]. It belongs to the molecular symmetry point group D2h.
Preparation and reactions
The complex is prepared by treating [Pt(NH3)4]Cl2 with hydrochloric acid.[2]
Many of the reactions of this complex can be explained by the trans effect. It slowly hydrolyzes in aqueous solution to give the mixed aquo complex trans-[PtCl(H2O)(NH3)2]Cl. Similarly it reacts with thiourea (tu) to give colorless trans-[Pt(tu)2(NH3)2]Cl2. In contrast, the cis isomer gives [Pt(tu)4]Cl2. Oxidative addition of chlorine gives trans-PtCl4(NH3)2.
Medicinal chemistry
trans-Dichlorodiammineplatinum(II) has had far less impact on medicinal chemistry compared to its cis isomer, cisplatin, which is a major anticancer drug. Nonetheless, replacement of the ammonia with other ligands has led to highly active drugs that have attracted much attention.[3]
References
- ↑ Nakata, B; Yamagata, S; Kanehara, I; Shirasaka, T; Hirakawa, K (25 June 2006). "Transplatin, a cisplatin trans-isomer, may enhance the anticancer effect of 5-fluorouracil". Journal of Experimental & Clinical Cancer Research: CR 25 (2): 195–200. PMID 16918130.
- ↑ 2.0 2.1 Kauffman, George B; Cowan, Dwaine O; Slusarczuk, George; Kirschner, Stanley (1963). "cis- and trans-Dichlorodiammineplatinum(II)". Inorg. Synth.. Inorganic Syntheses 7: 239–245. doi:10.1002/9780470132388.ch63. ISBN 9780470132388.
- ↑ Aris, S. M; Farrell, N. P (2009). "Towards Antitumor Active trans-Platinum Compounds". European Journal of Inorganic Chemistry 2009 (10): 1293–1302. doi:10.1002/ejic.200801118. PMID 20161688.
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