Premium
Über die Elektronenspinresonanzspektren einiger Cu 2+ ‐Komplexe in wässeriger Lösung
Author(s) -
Wüthrich K.
Publication year - 1966
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.19660490422
Subject(s) - chemistry , copper , spectral line , aqueous solution , hyperfine coupling , crystallography , hyperfine structure , analytical chemistry (journal) , stereochemistry , inorganic chemistry , radical , atomic physics , organic chemistry , physics , astronomy
The e.s.r. spectra of aqueous solutions of Cu 2+ ‐complexes with a series of methylpyridines (PYR) have been investigated at liquid nitrogen temperature. The experimental data indicate that the formula CU(PYR) 4 2+holds for the compounds in the frozen solutions. The marked decrease of the copper hyperfine coupling constant for some of the complexes is explained in terms of a distortion of the square planar structure towards a tetrahedral environment of the Cu 2+ . An analogous interpretation of the e.s.r. spectra of some copper containing electron‐transfer‐oxidases, e.g. ceruloplasmin and laccase, presents a possible explanation of the experimentally observed connections between the spectra and the enzymatic activity of these compounds.