Proton NMR Spectroscopy and Magnetic Properties of a Solution-Stable Dicopper(II) Complex Bearing a Single -Hydroxo Bridge
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- 作者：Iryna A. Koval ; Karlijn van der Schilden ; Anna Maria Schuitema ; Patrick Gamez ; Catherine Belle ; Jean-Louis Pierre ; Matthias Lü ; ken ; Bernt Krebs ; Olivier Roubeau ; and Jan Reedijk
- 刊名：Inorganic Chemistry
- 出版年：2005
- 出版时间：June 13, 2005
- 年：2005
- 卷：44
- 期：12
- 页码：4372 - 4382
- 全文大小：255K
- 年卷期：v.44,no.12(June 13, 2005)
- ISSN：1520-510X
文摘
The reaction of copper(II) perchlorate with the macrocyclic ligand [22]py4pz in the presence of base leads toformation of a dinuclear complex [Cu2([22]py4pz)(
-OH)](ClO4)3·H2O, in which two copper ions are bridged by asingle -hydroxo bridge. Each copper ion is further surrounded by four nitrogen atoms of the ligand. The -hydroxobridge mediates a strong antiferromagnetic coupling (2J = -691(35) cm-1) between the metal centers, leading torelatively sharp and well-resolved resonances in the 1H NMR spectrum of the complex in solution. We hereinreport the crystal structure, the magnetic properties, and the full assignment of the hyperfine-shifted resonances inthe NMR spectrum of the complex, as well as the determination of the exchange coupling constant in solutionthrough temperature-dependent NMR studies.
-OH)](ClO4)3·H2O, in which two copper ions are bridged by asingle -hydroxo bridge. Each copper ion is further surrounded by four nitrogen atoms of the ligand. The -hydroxobridge mediates a strong antiferromagnetic coupling (2J = -691(35) cm-1) between the metal centers, leading torelatively sharp and well-resolved resonances in the 1H NMR spectrum of the complex in solution. We hereinreport the crystal structure, the magnetic properties, and the full assignment of the hyperfine-shifted resonances inthe NMR spectrum of the complex, as well as the determination of the exchange coupling constant in solutionthrough temperature-dependent NMR studies.