Synthesis and properties of guanidine-pyridine hybridligands and structural characterisation of their mono- and bis(chelated) cobalt complexes
| Autor: | Janna Börner, Ulrich Flörke, Sonja Herres-Pawlis, Alexander Hoffmann |
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| Rok vydání: | 2009 |
| Předmět: |
Quenching (fluorescence)
Ligand Inorganic chemistry chemistry.chemical_element Trigonal pyramidal molecular geometry Chloride Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry Pyridine Materials Chemistry medicine Chelation Physical and Theoretical Chemistry Guanidine Cobalt medicine.drug |
| Zdroj: | Inorganica Chimica Acta. 362:1185-1193 |
| ISSN: | 0020-1693 |
| Popis: | 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)Cl2] and {N-(1,3-dimethylimidazolidin-2-yliden)pyridin-8-amine}cobalt(II)-dichloride [Co(DMEGpy)Cl2] 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)2Cl]2[CoCl4] and chlorobis{1,1,3,3-tetramethyl-2-((pyridin-2-yl)methyl)guanidine}cobalt(II)chloride [Co(TMGpy)2Cl]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 (d7) on the ligand fluorescence has been studied. |
| Databáze: | OpenAIRE |
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