Oligonuclear copper complexes of a bioinspired pyrazolate-bridging ligand: synthesis, structures, and equilibria in solution |
| |
Authors: | Prokofieva Angelina Prikhod'ko Alexander I Enyedy Eva Anna Farkas Etelka Maringgele Walter Demeshko Serhiy Dechert Sebastian Meyer Franc |
| |
Institution: | Institut für Anorganische Chemie, Georg-August-Universit?t, Tammannstrasse 4, D-37077 G?ttingen, Germany. |
| |
Abstract: | The synthesis of a new bioinspired dinucleating ligand scaffold based on a bridging pyrazolate with appended bis2-(1-methylimidazolyl)methyl]aminomethyl chelate arms is reported. This ligand forms very stable copper complexes, and a series of different species is present in solution depending on the pH. Interconversions between these solution species are tracked and characterized spectroscopically, and X-ray crystallographic structures of three distinct complexes that correspond to the species present in solution from acidic to basic pH have been determined. Overall, this provides a comprehensive picture of the copper coordination chemistry of the new ligand system. Alterations in the protonation state are accompanied by changes in nuclearity and pyrazolate binding, which cause pronounced changes in color and magnetic properties. Antiferromagnetic coupling between the copper(II) ions is switched on or off depending on the pyrazole binding mode. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|