science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: phosphorus tribromide Other Names: tribromophosphine Formula: PBr3 CAS-No.: 7789-60-8 Study: photolysis, uv absorption spectrum Authors: T. Kennedy, R.S. Sinclair, T.J. Sinclair Title: The U.V. spectrum and photolysis of phosphorus halides in hydrocarbon solvents - II: Phosphorus tribromide and phosphorus pentabromide in cyclohexane Journal/Source: J. Inorg. Nucl. Chem., 33, 2369-2376, (1971); doi:10.1016/0022-1902(71)80211-7 Data: table, diagram Energy/Wavelength range: 190 - 300 nm Resolution: Temperature: 298 K Temperature dependence: no Pressure/Concentration: Phase: solution (cyclohexane) pH: Comments: The u.v. spectrum of PBr3 in cyclohexane shows a strong absorption at 222 nm with shoulders at approximately 250 nm and 275 nm. The molar extinction coefficient was measured at the peak maximum and at the irradiating wavelength of 254 nm. Author to whom correspondence should be addressed: (e-mail address):