CADMIUM SULFIDE - (1306-23-6)

Introduction

Name: cadmium sulfide
* IUPAC
CAS Number: 1306-23-6
Chemical Formula: CdS
Molar Mass: 144.476 g
Mass Percent: Cd 77.806 %; S 22.193 % 

Classification

• inorganic

Uses/Function

• "Cadmium sulfide has long been used as an artist's color for permanent yellow, orange, and red." 1

• "As a pigment being fast to light and not affected by H2S; color for soaps; coloring glass yellow; coloring textiles, paper, rubber; in printing inks, ceramic glazes, fireworks; in phosphors and fluorescent screens; in scintillation counters, semiconductors, photoconductors. Dermatologic." 2

• "In certain solids such as titanium dioxide or cadmium sulfide, the energy of the band gap corresponds to that of light (visible, ultraviolet, or infrared), with the result that the solid, when illuminated, may become electrically conducting or acquire potent chemical redox characteristics because of the promotion of electrons to the conduction band (which is normally unoccupied)

Small band-gap semiconductors such as CdS could conceivably make use of the entire visible region of light, but they tend to photodegrade." 3

Physical Properties

Melting Point:*
1750°C 4 = 2023.15 K = 3182°F

Density (g/cm3):
4.83 at room temperature/pressure 5
4.82 6
* - 1 atm pressure

Solubility

Qualitative:
insoluble:  6
soluble:  6

Bonding

Bonding: polar covalent
Ionic Character: 26.97 %

Thermochemistry

ΔHf° (s): -38.7 kcal/mol 7 = -161.92 kJ/mol
ΔHf° (s): -38.70 kcal/mol = -161.9 kJ/mol 8
S° (s): 15.5 cal/(mol•K) 9 = 64.85 J/(mol•K)
S° (s): 15.51 cal/(mol•K) = 64.9 J/(mol•K) 10
ΔGf° (s): -37.4 kcal/mol 11 = -156.48 kJ/mol
ΔGf° (s): -37.40 kcal/mol = -156.5 kJ/mol 12

Reactions

Safety Information

NFPA 704 Ratings:
Health: 3 - Short exposure could cause serious temporary or moderate residual injury.
Flammability: 0 - Will not burn.
Reactivity: 0 - Normally stable, even under fire exposure conditions, and is not reactive with water.

For More Information

Wikipedia
Journals:
R. Neil Reese, Cindy A. White and Dennis R. Winge, Plant Physiol. 98, 225-229 (1992)
David M. Speiser, Susan L. Abrahamson, Gary Banuelos and David W. Ow, Plant Physiol. 99, 817-821 (1992)
Howell I. Runion and Carl C. Riedesel, Am. Biol. Teach. 28, 93-95 (1966)

Sources

(1) - Brownlee, Raymond B., Fuller, Robert W., and Whitsit, Jesse E. Elements of Chemistry; Allyn and Bacon: Boston, Massachusetts, 1959; p 560.
(2) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 1628.
(3) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; pp 74, 124.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4-48.
(5) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2003; p 4-48.
(6) - Dean, John A. Lange's Handbook of Chemistry, 11th ed.; McGraw-Hill Book Company: New York, NY, 1973; p 4-29.
(7) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-10.
(9) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(10) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-10.
(11) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(12) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-10.
(13) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 419.