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Ligand Exchange Reactions of Copper(II) Complexes of Urea Type Ligands: Syntheses, Structures, EPR Spectroscopy
Author(s) -
Gruschinski Sina,
Rodenstein Axel
Publication year - 2012
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.201200044
Subject(s) - electron paramagnetic resonance , chemistry , thiourea , nickel , copper , coordination sphere , crystallography , urea , spectroscopy , crystal structure , ligand (biochemistry) , nuclear chemistry , organic chemistry , nuclear magnetic resonance , physics , receptor , quantum mechanics , biochemistry
The synthesis of copper(II) and nickel(II) complexes of N , N ‐diethyl‐ N '‐benzoylurea H L 1 , N , N ‐diethyl‐ N' ‐(2, 6‐difluorbenzoyl)urea H L 2 , N , N ‐diethyl‐ N '‐benzoylthiourea H L 3 , N , N ‐diethyl‐ N '‐(3, 4, 5‐trimethoxybenzoyl)thiourea H L 4 and N , N ‐diethyl‐ N' ‐benzimidoylthiourea H 2 L 5 and the crystal structures of H L 2 , [Cu(L 2 ) 2 ] and [Ni( H L 5 ) 2 ] are reported. All Cu II complexes were investigated by EPR spectroscopy in liquid and frozen solutions. The Cu II complex [Cu( H L 5 ) 2 ] was additionally studied as diamagnetically diluted powder system [Ni( H L 5 ) 2 ] / [Cu( H L 5 ) 2 ] (99:1). The calculation of electron spin‐density distribution in the first coordination sphere of [Cu( H L 5 ) 2 ] is represented, based on well‐resolved 63, 65 Cu and 14 N hyperfine structure ( hfs ) couplings. Ligand exchange reactions of Cu II complexes of urea type ligands H L 1–4 and H 2 L 5 were studied by means of EPR spectroscopy in liquid solutions. Statistical and quantitative runs were derived from concentration‐dependent hfs line intensities.