Lead(II) iodide
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Lead(II) iodide (or lead iodide) is a chemical compound with the formula PbI
2. At room temperature, it is a bright yellow odorless crystalline solid, that becomes orange and red when heated.[11] It was formerly called plumbous iodide.
Names | |
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Other names
Plumbous iodide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.220 |
EC Number |
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PubChem CID |
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UNII | |
UN number | 2291 3077 |
CompTox Dashboard (EPA) |
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Properties | |
PbI 2 | |
Molar mass | 461.01 g/mol |
Appearance | bright yellow powder |
Odor | odorless |
Density | 6.16 g/cm3[1] |
Melting point | 410 °C (770 °F; 683 K)[1] |
Boiling point | 872 °C (1,602 °F; 1,145 K) decomp.[1] |
Solubility product (Ksp) |
4.41×10−9 (20 °C) |
Solubility | |
Band gap | 2.34 eV (direct)[6][7] |
−126.5·10−6 cm3/mol[8] | |
Structure[9] | |
Hexagonal hP6 | |
P63mc, No. 186 | |
a = 0.4556 nm, b = 0.4556 nm, c = 1.3973 nm α = 90°, β = 90°, γ = 120°° | |
Formula units (Z) |
2 |
octahedral | |
Thermochemistry[10] | |
Heat capacity (C) |
77.4 J/(mol·K) |
Std molar entropy (S⦵298) |
174.9 J/(mol·K) |
Std enthalpy of formation (ΔfH⦵298) |
-175.5 kJ/mol |
Gibbs free energy (ΔfG⦵) |
-173.6 kJ/mol |
Hazards | |
GHS labelling: | |
Danger | |
H302, H332, H360, H373, H410 | |
P201, P202, P260, P261, P264, P270, P271, P273, P281, P301+P312, P304+P312, P304+P340, P308+P313, P312, P314, P330, P391, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
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Other cations |
Tin(II) iodide |
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The compound currently has a few specialized applications, such as the manufacture of solar cells,[12] X-rays and gamma-ray detectors.[13] Its preparation is an entertaining and popular demonstration in chemistry education, to teach topics such as precipitation reactions and stoichiometry.[14] It is decomposed by light at temperatures above 125 °C (257 °F), and this effect has been used in a patented photographic process.[4][15]
Lead iodide was formerly employed as a yellow pigment in some paints, with the name iodide yellow. However, that use has been largely discontinued due to its toxicity and poor stability.[16]