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Raman spectral investigation of the cadmium thiocyanate complexes in solutions and solid
Author(s) -
AntiéJovanovié A.,
Jeremié M.,
Long D. A.
Publication year - 1982
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250120115
Subject(s) - thiocyanate , chemistry , cadmium , raman spectroscopy , aqueous solution , cadmium acetate , ligand (biochemistry) , analytical chemistry (journal) , crystallography , inorganic chemistry , organic chemistry , biochemistry , physics , receptor , optics
Raman intensity measurements have been made of cadmium thiocyanate aqueous solutions containing various ratios of total cadmium to total thioeyanate. Both Job and mole‐ratio methods indicated existence of a distinct complex species with a cadmium to thiocyanate ratio from 1 to 4. All average ligand number values obtained from three different series of experiments lie on the same curve, meaning that only mononuclear species are formed. Four overall stability constants have been calculated. The spectra are consistent with mononuclear complexes in solution, some having SCN − attached to the metal through the sulphur, others through the nitrogen. A band observed at 2132 cm −1 was assigned to the Cd(SCN) + complex while bands observed at 2102 and 784 cm −1 were attributed to higher members of the stepwise Cd(NCS) n 2−n series. The spectra of solid Cd(SCN) 2 were in accord with a bridged thiocyanate structure. Assignments were supported by x‐ray structural studies.