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Cis‐trans Isomerism in Copper(II) Complexes with N‐acyl Thiourea Ligands
Author(s) -
Hernández Wilfredo,
Spodine Evgenia,
Vega Andres,
Richter Rainer,
Griebel Jan,
Kirmse Reinhard,
Schröder Uwe,
Beyer Lothar
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400030
Subject(s) - thiourea , copper , chemistry , cis–trans isomerism , electron paramagnetic resonance , platinum , stereochemistry , crystallography , medicinal chemistry , organic chemistry , catalysis , physics , nuclear magnetic resonance
The N‐acyl thiourea complexes bis[N,N‐diethyl‐N′‐(p‐nitrobenzoyl)‐thioureato]copper(II) ( 1a,1b ) and bis(N,N‐diphenyl‐N′‐benzoylthioureato)copper(II) ( 2a,2b ) crystallize in each case in two modifications. X‐ray structural analysis shows that 1a and 1b are cis‐trans isomers. This is very unusual for N‐acyl thioureato complexes because with exception of one platinum(II) complex up to now only cis complexes have been found. In contrast X‐ray structural analysis of both forms 2a and 2b of the other complex shows no cis‐trans pair. Both modifications are cis complexes. In solution both isomers of the copper(II) complexes are observable by EPR spectroscopy.