Synthesis, X-ray Crystal Structure and Magnetism of [NiCl2{(bis(2-benzimidazolyl)propane}]2 · (C2H5OH)2 – A Second Example of a Ferromagnetically Coupled Five-Coordinated High-Spin Dichloro-Bridged Nickel(II) Dimer
✍ Scribed by Gerard A. van Albada; Jeroen J. A. Kolnaar; Wilberth J. J. Smeets; Anthony L. Spek; Jan Reedijk
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 368 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
The ligand bis(2-benzimidazolyl)propane coordinates to Ni II with a zero-field splitting parameter D (-14.3 cm -1 ) and a ferromagnetic exchange between the Ni ions in the dinuclear with chloride as an anion, thereby forming a dinuclear compound with the formula: [NiCl 2 (tbz) 2 ] 2 (C 2 H 6 O) 2 . This unit (J = +2.5 cm -1 ). The title compound appears to be the second example for a five-coordinated ferromagnetic compound crystallizes in the space group P2 1 /c. Each fivecoordinated Ni II ion has a distorted trigonal bipyramidal dinuclear Ni II compound of this type, and its magnetic properties appear to correlate with the ligand structure. With environment which consist of two asymmetrically bridging Cl anions with distances of 2.3556(17) and 2.4275(16) A ˚, a the availability of an increasing number of examples of such species it appears that antiferromagnetic exchange is found terminal Cl anion with a distance of 2.3496(17) A ˚and two nitrogen atoms of the ligand with distances of 2.022( 4) and for all cases with the chromophore N 2 ClNiCl 2 NiClN 2 where the MN 2 ring is 5-membered. In the case, where this ring is 2.000(4) A ˚. The Ni-Ni distance is 3.5891(12) A ˚, while the Ni-Cl-Ni angle is 97.23(6)°. The magnetic properties of the six-membered, the exchange is ferromagnetic. compound, as studied in the range 5-280 K, have been fitted