Journal
INORGANICA CHIMICA ACTA
Volume 362, Issue 4, Pages 1185-1193Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2008.06.002
Keywords
Guanidine ligands; Bis(chelate) coordination; Cobalt; X-ray diffraction; Spectroscopy
Categories
Funding
- Universitat Paderborn
- Stiftung der Deutschen Wirtschaft
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The synthesis of four guanidine-pyridine hybridligands and their spectroscopic features in MeCN are described. In order to demonstrate their coordinating properties, the corresponding cobalt(II) chloride complexes have been prepared and completely characterised by means of X-ray structure analysis, UV/Vis spectroscopy and mass spectrometry. The neutral complexes {1,1,3,3-tetramethyl-2-(quinolin-8-yl) guanidine} cobalt(II)-dichloride [Co(TMGqu)Cl-2] and {N-(1,3-dimethylimidazolidin-2-yliden)pyridin-8-amine} cobalt(II)-dichloride [Co(DMEGpy)Cl-2] exhibit a tetrahedral coordination of the cobalt atom, whereas in bis[chlorobis{N-(1,3-dimethylimidazolidin-2-yliden)quinolin-8-amine}cobalt(II)]tetrachlorocobaltate [Co(DMEGqu)(2)Cl](2)[CoCl4] and chlorobis{1,1,3,3-tetramethyl-2-((pyridin-2-yl)methyl)guanidine} cobalt(II) chloride [Co(TMGpy)(2)Cl]Cl, the cobalt atom is coordinated in a trigonal pyramidal environment. These trigonal pyramidal complex cations represent the. first bis(chelated) guanidine cobalt complexes in which the pyridine donor resides on the apical position and the guanidine donor forms with the chlorine atom the base of the pyramid. Besides the structural characterisation, the quenching effect of the cobalt(II) ion (d(7)) on the ligand. fluorescence has been studied. (C) 2008 Elsevier B. V. All rights reserved.
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