883905-91-7Relevant articles and documents
Mixed-ligand copper complexes with 8-methylthioquinoline and triphenylphosphane or the o-semiquinone/catecholate redox system
Ye, Shengfa,Sarkar, Biprajit,Niemeyer, Mark,Kaim, Wolfgang
, p. 4735 - 4738 (2005)
The complex [Cu(MTQ)(PPh3)2] (BF4), MTQ = 8-methylthioquinoline, exhibits distorted tetrahedral coordination at the copper(I) center. One of two crystallographically independent molecules found in the unit cell exhibits a more pronounced inclination towards a (3+1) coordination arrangement. In comparison to the analogous complex with the related imine/thioether chelate ligand 1-methyl-2-(methylthiomethyl)-1H- benzimidazole, the cation [Cu(MTQ)(PPh3)2]+ shows stronger bonding of CuI to S and weaker interaction with N. With 3,5-di-tert-butyl-o-semiquinone as co-ligand instead of two PPh3 ligands a valence-tautomer equilibrium situation involving the copper(II)-catecholate state can be observed by EPR spectroscopy, showing an unusually large isotropic 63,65Cu hyperfine coupling of 2.1 mT and an untypically small isotropic g value of 1.975. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.