Phosphide iodide

Class of chemical compounds

Phosphide iodides or iodide phosphides are compounds containing anions composed of iodide (I⁻) and phosphide (P³⁻). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the phosphide chlorides, arsenide iodides antimonide iodides and phosphide bromides.

Phosphorus can form clusters or chains in these compounds, so that some are 1-dimensional or fibrous.

Phosphide iodides are often metallic, black or dark red in colour.

List

formula	system	space group	unit cell Å	volume	density	comment	ref
[Si₄₀P₆]I_6.5	cubic	Pm3n	a=10.1293 Z=1	1039.3	3.412	clathrate	^[1]
K₄P₂₁I	orthorhombic	Ccmm	a = 12.853; b = 21.795; c = 9.748 Z = 4	2730.7	2.271	ruby red;sensitive to air	^[2]
Ca₂PI	trigonal	R3m	a=4.30 c=22.17		3.2	yellow	^[3]
Ca₃PI₃	cubic	I4₁32	a=12.31 Z=8		3.78	colourless	^[3]
Cu₂P₃I₂	monoclinic	P2₁c	a = 15.343, b = 12.925, c = 15.260, β = 116.38°, Z = 16			band gap 0.72 eV; Cu ion conductor	^[4]^[5]^[6]
Cu₃P₁₅I₂	monoclinic	P2₁/n	a=9.667, b=19.475, c=9.886, β =108.75(2)°, Z=4	1762.4		grey	^[5]^[7]
(CuI)₃P₁₂	monoclinic	P2₁	a=12.846 b=13.857 c=9.651 β=109.43 Z=4	1620.2	3.866	shiny	^[5]
(CuI)₂P₁₄	monoclinic	P2₁/c	a = 9.919, b = 9.718, c = 16.478, β = 105.71°, Z = 4	1529.0	3.539		^[8]
(CuI)₅P₁₆S							^[9]
(CuI)₃P₄S₄	hexagonal	P6₃cm	a=19.082, c=6.691 Z=6	2109.9			^[10]
(CuI)₈P₁₂	monoclinic	P12₁/c1	a=15.343, b=12.925, c=15.26, β=116.38		4.64		^[11]
Ge₃₈P₈I₈	Cubic	P43n	a=10.507			silvery	^[12]
(CuI)₅P₁₆Se							^[9]
(CuI)₂P₈Se₃		Pbcm	a=9.1348 b=12.351 c=13.873 Z=4	1565.2	3.673	red; melt 408 °C; P₈Se₃ clusters	^[13]
(CuI)₃P₄Se₄	hexagonal	P6₃cm	a = 19.601, c = 6.7196, Z = 6			orange	^[14]
Zn₃PI₃	cubic	F42m	a=5.945		4.87	dark grey; dec 300 °C	^[15]
(ZnI₂)₆ZnSP₄S₃							^[11]
(ZnI₂)₆ZnSeP₄Se₃	cubic	F43c	a=19.542	7463.1	4.325	brown	^[11]
Rb₄P₂₁I	orthorhombic	Ccmm	a = 13.281; b = 21.868; c = 9.771 Z=4	2838.1	2.619	dark red	^[2]
Sr₂P₇I	cubic	P2₁3	a=10.25			dark red; contains heptaphosphanortricyclane	^[16]
Zr₆I₁₄P	orthorhombic	Cmca					^[17]
Ag₂P₃I₂	monoclinic					Ag ion conductor	^[4]
(AgI)₂Ag₃PS₄	hexagonal	P6₃mc	a=7.395 c=12.224 Z=2	579.1		Ag ion conductor	^[18]
Cd₂P₃I	monoclinic	C2/c	a=8.255 b=9.304 c=7.514 β =99.66				^[19]
Cd₃PI₃	hexagonal	P6₃mc				band gap 2.44 eV	^[20]
Cd₄P₂I₃	orthorhombic	Pbca	a=12.890 b=12.725 c=12.654			P₂⁴⁻	^[19]
SnIP						soft and flexible; double helix SnI+ and P−; band gap 1.9 eV	^[21]^[22]
Sn₂₄P_19.3I₈	cubic	Pm3n	a=10.9554				^[23]
Sn₂₄P_19.3Br_xI_8−x	cubic	Pm3n					^[24]
Sn₂₄P_19.3(2)Cl_yI_8−y (y ≤ 0.8)	cubic	Pm3n					^[24]
Sn₂₀Zn₄P_20.8I₈	cubic	Pm3n	a=10.883 Z=1				^[25]
Sn₁₇Zn₇P₂₂I₈	cubic	Pm3n	a=10.8458 Z=1				^[25]
Sn₁₄In₁₀P₂₂I₈	cubic	Pm3n	a=11.0450 Z=1	1347.4	5.535	black	^[26]
Sn₁₄In₁₀P_21.2I₈		P4₂/m	a=24.745, c=11.067, Z=5	6776	5.521	black	^[26]
[Ge_30.5Sn_7.7P_7.75]I_7.88	cubic	Pm3n	a=10.721 Z=1				^[27]
Sn₂₄As_xP_19.3−xI₈	cubic	Pm3n	a = 10.9358—11.1495				^[28]
Cs_0.35Zr₆I₁₄P	orthorhombic	Cmca	a=15.934 b=14.287 c=12.939 Z=4			black	^[17]
Ba₂P₇I	monoclinic	P2₁/m	a=6.3538 b=6.8990 c=12.0392 β =95.515 Z=2	524.93	3.912	orange-yellow; water sensitive	^[29]
Ba₃P₃I₂	orthorhombic	Pnma	a = 17.195, b = 4.624, c = 14.272, Z = 4,				^[30]
Ba₅P₅I₃	monoclinic	C2/m	a = 42.664, b = 4.56.3, c = 9.431, β = 92.20, Z = 4				^[30]
La₂PI₂	trigonal	P3m1	a=4.236 c=10.121 Z=1	157.25	4.95		^[31]
Eu₂PI		R3m	a = 4.445, c = 23.12.6, Z = 3				^[32]
Eu₂P₇I	cubic	P2₁3				dark red; contains heptaphosphanortricyclane; band gap 1.7 eV	^[16]
Au₇P₁₀I	trigonal	P31m	a=6.180 c=11.122 Z=1				^[33]
Hg₉P₅I₆	monoclinic		a=13.112 b=12.486 c=17.031 β=119.90				^[34]
Hg₄ZnPI₄	monoclinic	P2₁	a = 7.850, b = 12.719, c = 7.861, β = 119.52°, Z = 2			like Millon phases	^[35]
Hg₇Ag₂P₈I₆	monoclinic	C1₂/m1	a=13.146 b=11.037 c=8.336 β=102.210 Z=2	1182.1	7.386	black	^[36]
Hg₁₂Ag₄₁P₈₈I₄₁	cubic	Fm3	a=26.705 Z=4	19045	5.147	dark red; air stable; P₁₁³⁻ clusters	^[37]
HgAg₆P₂₀I₂	monoclinic	P2₁/m	a = 6.718, b = 27.701, c = 7.383, β = 113.98°, Z = 2				^[38]

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