Premium
Spectra and thermodynamics of the cobalt(II) chloride — aluminum chloride gaseous complexes
Author(s) -
Papatheodorou G. N.
Publication year - 1975
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19754110210
Subject(s) - chemistry , chloride , cobalt , octahedron , inorganic chemistry , salt (chemistry) , absorption spectroscopy , aluminium , molten salt , spectral line , absorption (acoustics) , molecule , crystallography , crystal structure , materials science , organic chemistry , physics , quantum mechanics , astronomy , composite material
The reaction of solid cobalt(II) chloride with gaseous aluminum chloride to form blue gaseous complex(es) has been studied spectrophotometrically, in the range 600–800 K and 1–3 atm. The data are rationalized in terms of the reaction: CoCl 2 (s) + Al 2 Cl 6 (g) → CoAl 2 Cl 8 (g) (ΔH° = 10.0 ± 0.2 Kcal/mole, ΔS° = 9.8 ± 0.3 e.u.). The electronic absorption spectrum of the gaseous complex was compared with the spectra of Co(II) in different molten salt solvents. Thermodynamic and spectroscopic considerations suggest that the predominant absorbing species in the gaseous phase are Co(AlCl 4 ) 2 molecules having the Co(II) in a close to octahedral coordination.