Chemistry:Selenophosphate

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A selenophosphate is a chemical compound containing phosphate anions substituted with selenium. Over 7000 compounds are known with a bond between selenium and phosphorus. Compared to phosphorus-sulfur compounds selenophosphates are less thermally stable, and more easily destroyed by water. However they are more stable than tellurophosphates which have an even weaker phosphorus-tellurium bond.[1] Selenophosphates have an oxidation number for phosphorus of +5. But in many there are bonds between phosphorus atoms, reducing the oxidation state to +4, Some may be termed selenophosphites.[2]

Different structural anions include hexaselenohypodiphosphate [P2Se6]4− and [P6Se12]4− with decalin structure and [P4Se2]2− with dicyclobutane structure.[1]

Selenophosphates are coloured, often orange. They are semiconductors.

The first selenodiphosphate was discovered in 1973 by H. Hahn.[3]

Selenophosphate compounds may have some or all of the selenium replaced by sulfur.[4]

Formation

Selenophosphates can be produced by melting phosphorus selenide with metal selenides.

Molecular biology

Selenocysteine is produced in many organisms from a selenophosphate. In humans and other eucaryotes, this is facilitated by the enzyme selenophosphate synthetase 1. Selenium is connected to phosphorus using a reaction with selenide and adenosine triphosphate[5]

List

formula name mw crystal system space group unit cell Å volume density comments references
[(py2Li)]4[P2Se6]·2py water stable [6]
(NH4)4(P2Se6)(H2O)2 triclinic P1 a=7.3306 b=7.3761 c=9.5501 α =70.405° β =74.109° γ =60.681° Z=1 420.37 2.544 [7]
[pyH]4[P2Se6]·H2O water stable [6]
(NBu4)2P2Se8 bis(Tetrabutylammonium) 3,6-diselenoxo-1,2,4,5-tetraselena-3,6-diphosphacyclohexane 3,6-diselenide acetonitrile solvate monoclinic P21/c a 9.6284 b 16.9553 c 16.0899 β 96.875° chair config [8]
(NBu4)3P9Se14 orange-red [9]
bis(1-Butyl-3-methylimidazolium) 3,6-diselenoxo-1,2,4,5-tetraselena-3,6-diphosphacyclohexane 3,6-diselenide monoclinic P21/n a =7.6642 b =10.9948 c =17.0380 β =91.211° chair config [8]
bis(tetrakis(Acetonitrile-N)-lithium) 3,6-diselenoxo-1,2,4,5-tetraselena-3,6-diphosphacyclohexane 3,6-diselenide orthorhombic Pbam a 20.0535(6)Å b 12.1200(5)Å c 15.0831 cradle config [8]
bis((Tetrapyridine)-lithium) 3,6-diselenoxo-1,2,4,5-tetraselena-3,6-diphosphacyclohexane 3,6-diselenide triclinic P1 a 10.1582 b 10.7716 c 12.750 α 95.271° β 94.847° γ 114.219° cradle config [8]
Na2P4Se2 red-brown; P4 bicyclo structure [10]
Na3PSe4 cubic I43m a=7.3094 Z=2 3.53 Na ion conductor 1 mS cm−1 [11]
Na4P2Se6 orthorhombic Cmca a = 11.836 b = 13.311 c = 8.061 Z = 4 1270.0 3.283 [12]
Na4(P2Se6)(H2O)6 monoclinic P21/c a 26.0636 b 7.2350 c 20.7197 β 113.387° Z=8 3586.13 2.726 [7]
Mg2P2Se6 R3 a = 6.404 c = 20.194 Z=3 [13]
KPSe6 orthorhombic Pca21 a = 11.49 b = 6.791 c = 11.29 Z = 4 orange; NLO χ(2)≈142.8 pm V−1; band gap 2.1 eV [14][15][16][17]
K4Sc2(PSe4)2(P2Se6) monoclinic C2/c a=22.668Å b=6.8147Å c=19.828 β=113.91° [18]
K2P2Se6 trigonal P3121 a = 7.2728, c = 18.872 Z = 3 at 298 K; SHG 50× AgGaSe2 [19]
K2P2Se6 trigonal P3121 a = 14.4916 c = 18.7999 Z = 12 at 173 K [19]
K3PSe4·2Se6 cubic Fd3 a = 16.415 at 193 K [20]
K4(P2Se6)(H2O)4 orthorhombic Cmca a =11.921 b =12.46 c =11.752 Z=4 1745.6 2.908 [7]
K6P8Se18 1903.66 monoclinic P21/n a=9.746 b=8.332 c=23.054 β=90.54° Z=2 1872.1 3.377 orange [21]
Ca2P2Se6 monoclinic P21/n a = 9.664 b = 7.519 c = 6.859 β = 92.02° [22]
K4Sc2(PSe4)2(P2Se6) 737.82 monoclinic C2/c a=22.668 b=6.815 c=19.828 β =113.91° Z=8 2800.2 3.500 orange-yellow; turns red in air; band gap 2.25 eV [23]
KTiPSe5 [24]
K4Ti2(P2Se9)2(P2Se7) black [24]
Cr2P2Se6 [25]
MnPSe3 trigonal R3 band gap 2.5 eV [26][27]
K2MnP2Se6 monoclinic P21/n a=6.5349 b=12.696 c=7.589 β=102.67° Z=2 614.3 [28]
FePSe3 [26]
Fe2P2Se6 trigonal R3 band gap 1.3 eV [13][27]
K2FeP2Se6 monoclinic P21/n a=6.421 b=12.720 c=7.535 β=102.58 Z=2 600.7 red [28]
CuP2Se 2D semiconductor; metallises under pressure [29]
m-Cu4P2Se6 monoclinic P21/c a 6.370 b 11.780 c 20.013 β 90.03° [30]
Cu3PSe4 orthorhombic Pmn21 a=7.700 b=6.677 c=6.385 328.3 [31]
t-Cu4P2Se6 triclinic P1 a 7.104 b 11.889 c 12.759 α 74.35° β 79.63° γ 80.85° [30]
Cu4P3Se4 triclinic P1 a 6.440 b 7.085 c 10.616 α 73.11° β 74.86° γ 77.00° [30]
Cu4P4Se3 monoclinic P21/c a 16.446 b 6.515 c 17.339 β 119.08° [30]
CuP2Se orthorhombic Pbca a 5.608 b 6.496 c 16.570 [30]
CuAl[P2Se6] trigonal R3 a = 6.2795 c = 19.9713 Z =3 [32]
K2Cu2P4Se10 1118.78 monoclinic P21/n a=10.627 b=7.767 c=11.966 β=109.125° Z=2 933.2 3.981 red [33]
K3Cu3P3Se9 monoclinic P21/c a = 8.741 b = 10.774, c = 20.033, β = 92.96° [34][35]
[Cu12(P2Se6){Se2P(OEt)2}8] Et=Ethyl; diethyl diselenophosphate hexaselenodiphosphate(IV) [36]
[Cu12(P2Se6){Se2P(OiPr)2}8] iPr=isopropyl [36]
CuCr[P2Se6] monoclinic C2/m a=6.193 b=10.724 c=6.909 β=107.2° Z=2 690.2 4.9 melt 730 °C; dark red [3]
Zn2P2Se6 R3 a = 6.290 c = 19.93 Z=3 [13]
K2ZnP2Se6 monoclinic P21/c a = 12.537 b = 7.274 c = 14.164 β = 109.63° Z = 4 1216 yellow [37][38]
K4GeP4Se12 orthorhombic Pca21 a=13.9465 b=7.2435 c=24.0511 [39]
K4Ge4-xPxSe12 monoclinic P21/c a = 6.7388 b = 13.489 c = 6.3904 β = 91.025° [40]
K7As3(P2Se6)4 monoclinic P21/c a=25.0706 b=9.5948 c=59.6227 β=93.384° melt 388°C [41]
K6As2(P2Se6)3 monoclinic P21/c a 8.0898 b 23.3142 c 12.1919 β 124.809° melt 410°C; orange; band gap 2.2 eV [41]
RbPSe6 orthorhombic Pca21 a = 11.776 b = 6.858 c = 11.460 Z = 4 NLO χ(2)≈150 pm V−1 [15][16]
Rb2P2Se6 trigonal P3121 a = 7.2982 c = 19.002 and Z = 3 100 K [19]
Rb4P2Se9 monoclinic C2/c a = 9.725 b = 10.468 c = 19.155 β = 93.627° Z = 4 1946.1 3.804 [12]
Rb4P6Se12 orthorhombic Pca21 a =16.409 b =10.64 c =15.105 bicyclic with >PP< bridge and -SePSe2PSe2Se- ring [42]
Rb10P4Se25 [43]
Rb4(P2Se6)(H2O)4 orthorhombic Pnnm a 9.834 b 12.456 c 7.585 Z=2 929.1 3.395 [7]
RbTiPSe5 [24]
Rb4Ti2(P2Se9)2(P2Se7) orthorhombic Fdd2 a=35.55 b=37.315 c=6.574 Z=4 8772 3.956 black [24][44]
Rb2MnP2Se6 [28]
Rb2ZnP2Se6 triclinic P1 a = 7.494 b = 7.601 c = 12.729 α = 96.57° β = 105.52° γ = 110.54° Z = 2 636.6 [38]
Rb4GeP4Se12 orthorhombic Pca21 a=14.1881 b=7.3566 c=24.2914 [39]
Rb6Ge2P2Se14 triclinic P1 a = 7.2463 b = 9.707 c = 11.987 α = 79.516° β = 89.524° γ = 68.281° band gap 2.2 eV [40]
Sr2P2Se6 monoclinic P21/n a = 9.844 b = 7.788 c = 6.963 β = 91.50° Z=2 [22]
NaYP2Se6 647.6 triclinic P1 a=6.9456 b=7.4085 c=9.5306 α=88.819° β=87.748° γ=89.580° Z=2 yellow [45][46] follow up refs
KYP2Se6 orthorhombic P212121 a = 6.7366 b = 7.4286 c = 21.603 Z = 4 [45][47]
[(Cp′′2Zr)2(μ,η1:1:1:1-P2Se4)] Cp′′ = C5H3tBu2 1269.41 monoclinic P21/n a=15.2831 b=9.91947 c=18.6250 β=102.835° Z=2 2753 1.531 dark purple [48]
KZrPSe6 orthorhombic Pmc21 a=3.7079 b=15.074 c=18.491 [49]
RbZrPSe6 [49]
KNb2PSe10 monoclinic Pc a=7.2931 b=15.612 c=13.557 β=106.64° resistivity 4.5 Ω·cm [50]
RbNb2PSe10 monoclinic Pc a=7.381 b=7.8359 c=13.564 β=106.75° [50]
K3RuP5Se10 monoclinic P21/m a 11.2099 b 7.2868 c 12.3474 β 93.958° [51]
PdPSe semiconductor [52]
K2PdP2Se6 [24]
Rb2PdP2Se6 [24]
Ag4P2Se6 1013.69 orthorhombic P212121 a=6.5760 b=11.5819 c=14.137 Z=4 1076.8 5.966 melt 642 °C; dark red [53]
AgAl[P2Se6] monoclinic C2/m a=6.348 b=10.989 c=7.028 β=107.2° Z=2 melt 588 °C; yellow [3]
K2Ag2P2Se6 monoclinic P21/c a=8.528 b=11.251 c=20.975 β=93.24° Z=4 2009 orange [28]
AgCr[P2Se6] monoclinic C2/m a=6.305 b=10.917; c=6.991 β=107.7° Z=2 melt 720 °C; dark red [3]
AgGa[P2Se6] orthorhombic Pbca α=12.169 b=22.484 c=7.473 Z=4 2044.7 melt 450 °C; orange [3]
AgGa[P2Se6] trigonal P31/c a=6.375 c=13.320 Z=2 468.81 5.05 dark red [3]
AgScP2Se6 688.54 trigonal P31/c a=6.463 c=13.249 Z=2 482.93 4.735 orange or brown [54]
CdPSe3 [26]
K2CdP2Se6 monoclinic P21/n dark yellow [37]
Rb2CdP2Se6 819.05 monoclinic P21/n a=6.640 b=12.729 c=7.778 β=98.24° Z=2 650.5 4.180 dark yellow; air stable [37]
Rb8Cd4(Se2)(PSe4)4 [24]
InPSe3 [26]
In2(P3Se9) monoclinic P21/n [34]
LiInP2Se6 657.46 trigonal P31/c a=6.397 c=13.350 Z=2 473.15 4.615 band gap 2.06 eV [55]
(Ph4P)[In(P2Se6)] monoclinic C2/c a = 23.127 b = 6.564 c = 19.083 β = 97.42° Z = 4 2873 @23 °C yellow [56]
KInP2Se6 monoclinic P21/n a=7.511 b=6.4861 c=22.789 β=98.91° Z=4 1096.9 [57]
K5In33-Se)(P2Se6)3 triclinic P1 a 7.6603 b 13.1854 c 18.378 α 87.04° β 88.659° γ 82.025° [58]
K4In4(μ-Se)2(P2Se6)3 monoclinic P21/c a 19.707 b 7.712 c 13.229 α 90° β 106.42° [58]
K4In2(PSe5)2(P2Se6) monoclinic Cc a=11.1564 b=22.8771 c=12.6525 β=109.039° Z=4 brick-red; air stable [59]
K4In4(μ-Se)(P2S2.36Se3.64)3 triclinic P1 a 7.7709 b 13.0007 c 18.9382 α 105.382° β 92.632° γ 91.91° [58]
CuInP2Se6 trigonal P31/c a=6.392 c=13.338 Z=2 472.0 5.0 melt 642 °C; dark red [3]
AgInP2Se6 trigonal P31/c a=6.483 c=13.330 Z=2 485.2 5.2 semiconductor; melt 673 °C; dark red; band gap 1.79 eV [60][3]
SnP2Se6 R3 a = 6.3213 c = 19.962 band gap 1.36–1.41 eV [61]
Sn2P2Se6 [62]
Na11.1Sn2.1P0.9Se12 tetragonal I41/acd a=14.2446 c=28.473 Z=8 5777.4 3.403 Na+ ion conductivity 3.0 mS/cm [63]
Rb3Sn(PSe5)(P2Se6) monoclinic P21/a a=14.013 b=7.3436 c=21.983 β=106.61° Z=4 black [59]
K10Sn3(P2Se6)4 trigonal R3 a = 24.1184 c = 7.6482 @100K; band gap 1.82 eV [64]
Rb4Sn5P4Se20 2638.41 trigonal P3m1 a=7.6163 c=18.6898 Z=1 938.91 4.64 black [65]
Rb4Sn2Ag4(P2Se6)2 monoclinic P21/n a=11.189 b=7.688 c=21.850 β=94.31° Z=2 1874.2 4.639 black [24][66]
Rb5[Sn(PSe5)3] triclinic P1 a 11.745 b 19.23 c 7.278 α 99.97° β 107.03° γ 87.16° [67]
Sb4(P2Se6)3 monoclinic P21/n a = 20.777 b = 7.4935 c = 9.4949 β = 91.25° [68]
KSbP2Se6 696.55 [34]
β-KSbP2Se6 696.55 monoclinic P21 a=6.8925 b=7.8523 c=10.166 β=91.487 Z=2 550.4 4.203 dark red [69]
AgSbP2Se6 hygroscopic [70]
α-CsPSe6 monoclinic P21/n a = 6.877 b = 12.713 c = 11.242 β = 92.735° Z = 4 orange [14][15]
β-CsPSe6 637.64 tetragonal P421c a = 12.526 c = 12.781 Z = 8 2005.3 4.224 red orange; metastable; SHG χ(2) ∼30 pm/V [14]
Cs2P2Se8 orthorhombic Ccce a = 14.982 b = 24.579 c = 13.065 band gap 2.44 ± 0.2 eV; P2Se4 ring; third harmonic generator coefficient 2.4 ± 0.1 × 105 pm2/V2 [71]
Cs3PSe4 orthorhombic Pnma a = 10.0146 b = 11.990 c = 9.9286 Z = 4 1192.2 4.154 [12]
Cs4P2Se9 [24]
Cs4P2Se10 triclinic P1 a=7.359 b=7.455 c=10.142 α=85.938°, β=88.055° γ=85.609° [P2Se10]4− [72]
Cs4[P6Se12] 1664.98 monoclinic P21/n a =10.836 b =10.5437 c =12.273 β =98.661° 1386.3 3.989 orange; melt 697; NLO [73]
Cs5[P5Se12] 1766.92 tetragonal P4 a =13.968 c =7.546 Z=2 1472.2 3.986 orange; NLO; band gap 2.17 eV [73][74]
Cs10P8Se20 orthorhombic Pnnm a = 26.5456 b = 8.0254 c = 11.9031 Z = 2 2535.8 4.133 (PSe2)3Se rings and P2Se6 [75]
Cs4(P2Se6)(H2O)4 orthorhombic Pnnm a=10.0514 b=12.6867 c=7.8403 Z=2 999.8 3.775 [7]
K0.6Cs0.4PSe6 orthorhombic Pca21 a=11.830 b=6.908 c=11.516 Z=4 941.1 4.085 orange; band gap 2.1 eV; SHG χ(2) ∼150 pm/V [14]
KCsP2Se8 orthorhombic Ccce a = 14.782 b = 23.954 c = 13.044 band gap 2.36 ± 0.2 eV [71]
Cs2MnP2Se6 monoclinic P21/n 6.4761 b=13.006 c=7.974 β=93.09° Z=2 670.6 [28]
Cs2FeP2Se6 [28]
Cs2Cu2P2Se6 monoclinic P21/c a=9.958 b=13.067 c=10.720 β=102.46° Z=4 1363 dark green [28]
Cs2ZnP2Se6 triclinic P1 a = 7.6543 b = 7.7006 c = 12.737 α = 97.007° β = 104.335° γ = 109.241° Z = 2 669.5 yellow; band gap 2.67 eV [38][74]
Cs4GeP4Se12 orthorhombic Pca21 a=14.3268 b=7.6202 c=24.6301 [39]
Cs6As2(P2Se6)3 monoclinic P21/c a=19.5759 b=7.9206 c=13.0553 β=101.914° orange band gap 2.1 eV [41]
Cs5As(P2Se6)2 tetragonal P42/m a=13.826 c=7.5173 melt 416°C; red; band gap 2.0 eV [41]
RbCsP2Se8 orthorhombic Ccce band gap 2.41 ± 0.2 eV [71]
CsZrPSe6 band gap 2.0 eV [74][49]
CsNb2PSe10 monoclinic Pc a=14.6257 b=7.8097 c=13.5533 β=98.557° [50]
Cs4Pd(PSe4)2 monoclinic P21/c a = 7.491 b = 13.340 c = 10.030 β = 92.21° Z = 2 red [76]
Cs10Pd(PSe4)4 tetragonal P42c a = 13.949 c = 11.527 Z = 4 red [76]
Cs2PdP2Se6 tetragonal P42/mnm a = 8.5337 c = 10.5595 Z = 4 black [76]
Cs2Ag2P2Se6 monoclinic P21/n a=6.807 b=12.517 c=8.462 β=95.75° Z=2 717.3 yellow [28]
Cs2CdP2Se6 monoclinic P21/n yellow [37]
Cs5In(P2Se6)2 tetragonal P42/m a = 13.886 c = 7.597 Z = 2 1464.9 @23 °C; dark orange [56]
Cs4Sn(P2Se6)2 1721.73 trigonal R3 a=7.808 c=37.905 Z=3 2001.4 4.285 black [77]
α-Cs2SnP2Se6 920.2 monoclinic P21/c a=10.230 b =12.990 c=10.949 β=94.529° 1450.5 4.2126 orange [77]
Cs2SnP2Se6 monoclinic P21/c a = 10.1160 b = 12.7867 c = 11.0828 β = 94.463° @100K [64]
Cs4(Sn3Se8)[Sn(P2Se6)]2 2828.17 tyrigonal P3m1 a=7.695 c=18.797 Z=1 964.0 4.872 black; 2D [77]
Cs6[Sn2Se4(PSe5)2] triclinic P1 a 9.899 b 12.416 c 7.497 α 91.62° β 110.19° γ 79.94° [67]
CuSbP2Se6 C2/m [78]
AgSbP2Se6 C2/m [78]
Cs8Sb4(P2Se6)5 [34]
Ba2P2Se6 monoclinic P21/n a = 10.355 b = 7.862 c = 7.046 β = 90.83° Z=2 [22]
Ba3(PSe4)2 monoclinic P21/a a = 12.282 b = 6.906 c = 18.061 β = 90.23° Z = 4 [79][80]
Ba3PO4PSe4 triclinic P1 a=6.779 b=7.108 c=12.727 α=82.45 β=78.88 γ=81.34 Z=2 orange [79]
KBaPSe4 orthorhombic Pnma a=11.972 b=6.973 c=10.388 Z=4 pale orange [79]
KLaP2Se6 713.71 monoclinic P21/c a=12.425 b=7.8047 c=11.9279 β=109.612° 1089.6 4.351 yellow [34]
K2La(P2Se6)1/2(PSe4) monoclinic P21/n a = 9.4269 b = 7.2054 c = 21.0276 β = 97.484° Z = 4 [81]
K3La(PSe4)2 monoclinic P21/c a = 9.5782 b = 17.6623 c = 9.9869 β = 90.120° Z = 4 [81]
K3LaP2Se8
K4La0.67(PSe4)2 orthorhombic Ibam a = 19.0962 b = 9.1408 c = 10.2588 Z = 4 [81]
K6LaP4Se16
K8.5La1+1/3(PSe4)4 orthorhombic Ccca a = 18.2133 b = 38.0914 c = 10.2665 Z = 8 [81]
Ce4(P2Se6)3 722.06 monoclinic P21/c a = 6.8057 b = 22.969 c = 11.7226 β = 124.096° Z = 6 4.741 orange [82]
NaCeP2Se6 monoclinic P21/c a = 12.1422 b = 7.6982 c = 11.7399 β = 111.545° Z=4 yellow [82]
KCeP2Se6 monoclinic P21/c [45]
Cu0.4Ce1.2P2Se6 monoclinic P21/c a = 12.040 b = 7.6418 c = 11.700 β = 111.269° Z = 4 yellow [82]
Rb2CeP2Se7 monoclinic P21/n red; air sensitive [83]
Rb3CeP2Se8 1090.13 monoclinic P21/c a = 9.6013 b = 18.0604 c = 10.0931 β = 90.619° Z = 4 1750.07 4.137 orange; air sensitive [83]
Rb9Ce(PSe4)4 monoclinic C2/c a=21.446 b=10.575 c=18.784 β =115.94° Z=4 3831 3.980 orange; air and water destroyed; soluble in 18-crown-6 + dmf; band gap 2.26 eV [43]
AgCeP2Se6 monoclinic P21/c a = 9.971 b = 7.482 c = 11.757 β = 145.630° Z=2 orange [82]
CsCe[P2Se6] monoclinic P21/c a = 12.9786 b = 7.7624 c = 11.9843 β = 106.589° Z = 4 [84]
KPrP2Se6 monoclinic P21/c [45]
Cs2PrP2Se7 monoclinic P21/n a=10.2118 b=7.2423 c=20.3741 β =98.624° Z=4 [85]
Eu2P2Se6 monoclinic P21/n a = 9.779 b = 7.793 c = 6.957 β = 91.29° Z=2 [22]
LiEuPSe4 orthorhombic Ama2 a = 10.5592 b = 10.415 c = 6.4924 Z = 4 red; air unstable [86]
Na8Eu2(Si2Se6)2 monoclinic C2/m a=7.090 b=12.228 c=7.950 β=107.427° Z = 1 657.6 [87]
KEuPSe4 monoclinic P21/m a = 6.8469 b = 6.9521 c = 9.0436 β = 107.677° Z = 2 red; air unstable [86]
KEuPSe4 orthorhombic Pnma a = 17.516 b = 7.0126 c = 6.9015 Z = 4 [81]
K4Eu(PSe4)2 orthorhombic Ibam a = 19.020 b = 9.131 c = 10.198 Z = 4 [34][88]
Cs3GdP2Se8 monoclinic P21/c [83]
NaSmP2Se6 709.94 triclinic P1 a 6.8368 b 7.5312 c 9.557 α 90.799° β 91.910° γ 90.351° Z=2 red [45]
Na9Sm(Ge2Se6)2 monoclinic C2/m a = 7.916 b = 12.244 c = 7.105 β = 106.99° Z = 1 658.6 [87]
KSmP2Se6 725.15 monoclinic P21 a=6.7888 b=7.6185 c=10.1962 β=91.508 Z=2 527.17 4.568 red [89]
CsSmP2Se6 orthorhombic P212121 a = 6.8867 b = 7.5448 c = 22.152 Z = 4 [45][84]
NaGdP2Se6 715.94 triclinic P1 a 6.8464 b 7.4916 c 9.5372 α 90.813° β 92.026° γ 90.241° Z=2 yellow [45]
KGdP2Se6 monoclinic P21 a=6.7802 b=7.5809 c=10.1967 β=91.638 Z=2 523.97 4.640 yellow [45][89]
Rb2GdP2Se7 1037.73 monoclinic P21/n a = 10.137 b = 7.212 c = 20.299 β = 98.23° Z = 4 1468.8 4.692 orange; air sensitive [83]
NaTbP2Se6 717.61 triclinic P1 a 6.8854 b 7.4580 c 9.5196 α 89.068° β 87.899° γ 89.974° Z=2 yellow [45]
KTbP2Se6 monoclinic P21 a=6.7609 b=7.5570 c=10.2158 β=91.732 Z=2 521.71 4.671 yellow [45][89]
KTbP2Se6 orthorhombic red over 9.2 GPa [90]
NaDyP2Se6 721.19 triclinic P1 a 6.9114 b 7.4258 c 9.5256 α 88.914° β 87.829° γ 89.695° Z=2 yellow [45]
CsEr[P2Se6] monoclinic P21/c a = 7.5381 b = 12.8192 c = 12.7647 β = 106.898° Z = 4 [84]
AgErP2Se6 810.83 trigonal P31/c a=6.578 c=13.410 Z=2 502.6 5.358 dark brown [54]
AgTmP2Se6 812.50 trigonal P31/c a=6.567 c=13.422 Z=2 501.27 5.383 dark brown [54]
K3AuP2Se8 monoclinic Cc a = 7.122 b = 12.527 c = 18.666 β = 96.06° Z = 4 [91]
Rb3AuP2Se8 monoclinic Cc [91]
Cs3AuP2Se8 monoclinic Cc [91]
K2Au2P2Se6 monoclinic C2/m a = 12.289 b = 7.210 c = 8.107 β = 115.13° Z = 2 black [91]
Rb2Au2P2Se6 monoclinic C2/m [91]
Rb2Au2P2Se6 monoclinic P21/n a=11.961 b=10.069 c=32.137 β=91.37° Z=12 3869 4.653 @-120 °C black [92]
Hg2P2Se6 [34][93]
K2HgP2Se6 monoclinic P21/c a=13.031 b=7.308 c=14.167 β=110.63° Z=4 1262.6 4.285 dark yellow [37]
Rb2HgP2Se6 monoclinic P21/c drak yellow [37]
Rb8Hg4(Se2)(PSe4)4 P42/n a=17.654 c=7.226 [24][94]
Tl4P2Se6 trigonal R3 a=6.3808 c= 20.014 melt 963 K [34][95]
TlInP2Se6 triclinic P1 a=6.4488 b=7.5420 c=12.166 α=100.72° β=93.63° γ=113.32° melt 875K [96][95]
TlSbP2Se6 monoclinic P21 a = 6.843 b = 7.841 c = 9.985 β = 90.77° Z = 2 melt 720K; band gap 1.75 eV [97]
Pb2P2Se6 monoclinic Pn a = 9.742 b = 7.662 c = 6.898 β=91.44° Z=2 514.73 6.13 melt 812 °C;band gap 1.88 eV [34][98][99]
Na1.5Pb0.75PSe4 cubic I43d a=14.3479 Z=16 band gap 2 eV [100]
RbPbPSe4 red water stable [88]
Rb4Pb(PSe4)2 orthorhombic Ibam a = 19.134 b = 9.369 c = 10.488 Z = 4 orange water unstable [88]
CsPbPSe4 orthorhombic Pnma a = 18.607 b = 7.096 c = 6.612 Z = 4 red water stable [88]
Cs4Pb(PSe4)2 orange water unstable [88]
Bi4(P2Se6)3 monoclinic P21/n a = 20.869 b = 7.4745 c = 9.5923 β = 91.73° [68]
β-Bi4(P2Se6)3 triclinic P1 a = 12.2303 b = 6.7640 c = 17.866 α = 90.493° β = 94.133° γ = 91.163° black [101]
KBiP2Se6 783.78 monoclinic P21 a 6.9183 b 7.663 c 10.239 β 91.508° Z=2 542.6 4.797 [34][69]
CuBiP2Se6 R3 a = 6.553 c = 39.76 lamellar; p-type semiconductor; work function 5.26 eV [102][103]
AgBiP2Se6 R3 a = 6.652 c = 39.61 lamellar [102]
Cs5BiP4Se12 orthorhombic Pmc21 a = 7.5357 b = 13.7783 c = 28.0807 Z = 4 band gap 1.85 eV; melt 590 °C [104]
α-TlBiP2Se6 monoclinic P2l/c a =12.539 b =7.499 c =12.248 β =113.731° chains; band gap 1.23,1eV [105]
β-TlBiP2Se6 monoclinic P2l/c a =12.25 b =7.5518 c =22.834 β =97.65° melt 544 °C; layers; band gap 1.27 eV [105]
K2ThP3Se9 triclinic P1 a = 10.4582 b = 16.5384 c = 10.2245 α = 107.637 β = 91.652 γ = 90.343° Z = 2 [106]
β-K2ThP3Se9 monoclinic P21/n a = 10.2697 b = 7.7765 c = 20.472 β = 92.877° Z = 4 yellow [107]
Rb2ThP3Se9 triclinic P1 a = 10.5369 b = 16.6914, c = 10.2864 α = 107.614° β = 92.059° γ = 90.409° Z = 2 [106]
Rb7Th2P6Se21 triclinic P1 a = 11.531 b = 12.359 c = 16.161 α = 87.289° β = 75.903° γ = 88.041° Z = 2 red; band gap 2.0 eV [108]
Cs4Th4P4Se26 orthorhombic Pbca a = 12.0130 b = 14.5747 c = 27.134 Z = 8 orange; (P2Se9)6- anion [109]
Cs4Th2P5Se17 monoclinic P2l/c a = 10.238 b = 32.182 c = 10.749 β = 95.832° Z = 4 [106]
K2UP3Se9 triclinic P1 a = 10.407( b = 16.491 c = 10.143 α= 107.51° β = 91.74° γ = 90.28° Z = 4 black [24][110]
Rb4U2P5Se17 triclinic P1 a =10.0824 b = 10.6905 c = 15.7845 α = 84.678 β = 76.125 γ = 85.874° @100K [111]
Rb4U4P4Se26 3470.84 orthorhombic Pbca a=11.9779 b=14.4874 c=27.1377 Z=4 4709.17 4.895 U5+ [112]
Cs2U2(P2Se9)(Se2)2 orthorhombic Pbca a 11.769 b 14.389 c 26.537 black [113]


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