[Cu(MTQ)(PPh3)2](BF4) (1, MTQ = 8-methylthioquinoline) was prepd. and characterized by x-ray crystallog. 1 Exhibits distorted tetrahedral coordination at the copper(I) center. One of two crystallog. independent mols. 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, [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 equil. situation involving the copper(II)-catecholate state can be obsd. by EPR spectroscopy, showing an unusually large isotropic 63,65Cu hyperfine coupling of 2.1 mT and an atypically small isotropic g value of 1.975. [on SciFinder(R)]
%0 Journal Article
%1 Ye.2005c
%A Ye, Shengfa
%A Sarkar, Biprajit
%A Niemeyer, Mark
%A Kaim, Wolfgang.
%D 2005
%J European Journal of Inorganic Chemistry
%K ESR;crystal complex complex;ESR copper methylthioquinoline phosphine prepn semiquinone structure tautomer valence
%N 23
%P 4735--4738
%R 10.1002/ejic.200500567
%T Mixed-ligand copper complexes with 8-methylthioquinoline and triphenylphosphane or the o-semiquinone/catecholate redox system
%X [Cu(MTQ)(PPh3)2](BF4) (1, MTQ = 8-methylthioquinoline) was prepd. and characterized by x-ray crystallog. 1 Exhibits distorted tetrahedral coordination at the copper(I) center. One of two crystallog. independent mols. 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, [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 equil. situation involving the copper(II)-catecholate state can be obsd. by EPR spectroscopy, showing an unusually large isotropic 63,65Cu hyperfine coupling of 2.1 mT and an atypically small isotropic g value of 1.975. [on SciFinder(R)]
@article{Ye.2005c,
abstract = {[Cu(MTQ)(PPh3)2](BF4) (1, MTQ = 8-methylthioquinoline) was prepd. and characterized by x-ray crystallog. 1 Exhibits distorted tetrahedral coordination at the copper(I) center. One of two crystallog. independent mols. 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, [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 equil. situation involving the copper(II)-catecholate state can be obsd. by EPR spectroscopy, showing an unusually large isotropic 63,65Cu hyperfine coupling of 2.1 mT and an atypically small isotropic g value of 1.975. [on SciFinder(R)]},
added-at = {2022-06-15T11:26:56.000+0200},
author = {Ye, Shengfa and Sarkar, Biprajit and Niemeyer, Mark and Kaim, Wolfgang.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/259ea32df9f338e54be466df109718c23/huebleriac},
doi = {10.1002/ejic.200500567},
interhash = {fa58952190a8702d71b03ac0e24f16fd},
intrahash = {59ea32df9f338e54be466df109718c23},
issn = {1434-1948},
journal = {European Journal of Inorganic Chemistry},
keywords = {ESR;crystal complex complex;ESR copper methylthioquinoline phosphine prepn semiquinone structure tautomer valence},
number = 23,
pages = {4735--4738},
timestamp = {2022-06-15T09:26:56.000+0200},
title = {Mixed-ligand copper complexes with 8-methylthioquinoline and triphenylphosphane or the o-semiquinone/catecholate redox system},
year = 2005
}
