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Verdampfung von Kupfer(II)chlorid und Struktur des Dampfes untersucht mit UV./VIS.‐ und Raman ‐Spektroskopie
Author(s) -
Dienstbach Falko,
Emmenegger Franz Peter,
Schläpfer Carl Wilhelm
Publication year - 1977
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19770600732
Subject(s) - chemistry , raman spectroscopy , crystallography , enthalpy , molecule , spectroscopy , analytical chemistry (journal) , physics , organic chemistry , chromatography , quantum mechanics , optics
The vapour pressure of CuCl 2 and the dimerization of CuCl 2 (g) have been investigated by optical spectroscopy in the range 420–650°C, p Cl 2= 0.5‐5 atm. The enthalpy of dimerization of CuCl 2 (g) was determined by visible and by Raman spectroscopy and good agreement was found (−154 kJmol −1 and −143 kJmol −1 ). CuCl 2 (g) shows two totally symmetric Raman modes (373 and 127 cm −1 ) indicating that, at least at elevated temperatures, CuCl 2 (g) is not a linear molecule. The optical spectra of Cu 2 Cl 4 (g) and CuLCl 5 (g) (L Ga, In) are very similar supporting a CuCl 3 ‐chromophor in both cases. The formerly proposed structure of CuL 2 Cl 8 (g) (L Al, Ga) contains bridging and terminal chlorides, structural elements also present in Cu 2 Cl 4 (g). In agreement with the proposed structure v Cu‐Cl termis identical in Cu 2 Cl 4 (g) and CuL 2 Cl 8 (g), while V Cu‐Cl bridg.is at lower energies (20–30 cm −1 ) in CuL 2 Cl 8 (g) than in Cu 2 Cl 4 (g).