A novel one-dimensional nickel(II) alternating chain from discrete pyrazolate-based dinuclear complexes
| Autor: | Björn Antelmann, Franc Meyer, Peter Schober, Laszlo Zsolnai, Uwe Ruschewitz |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Journal of the Chemical Society, Dalton Transactions. :1181-1186 |
| ISSN: | 1364-5447 0300-9246 |
| DOI: | 10.1039/a708565f |
| Popis: | Hexadentate dinucleating ligands that are based on a bridging pyrazolate bearing chelating side arms [3,5-(R2NCH2)2C3N2H2; R2N = Me2N(CH2)3NMe (HL1), Me2N(CH2)2NMe (HL2)] reacted with NiCl2·6H2O to yield complexes ClNi(µ-Cl)(µ-L1)NiCl 1 (Ni2L1Cl3) and ClNi(µ-Cl)(µ-L2)NiCl 2 (Ni2L2Cl3), respectively. Depending on the side-arm chain length and the solvent used for crystallisation these complexes either crystallised as dicrete bimetallic units (1) or were assembled via di-µ-chloro linkages to form a tetranuclear compound [ClNi(µ-Cl)(µ-L2)Ni(µ-Cl)2Ni(µ-Cl)(µ-L2)NiCl] 2a ([Ni2L2Cl3]2) or a novel bridge-alternating one-dimensional chain [Ni(µ-Cl)(µ-L1)Ni(µ-Cl)2]∞ 2b ([Ni2L2Cl3]∞) in the solid state. Variable-temperature magnetic susceptibility measurements revealed antiferromagnetic coupling within the basic µ-chloro-µ-pyrazolato bridged bimetallic framework in all cases and also suggested antiferromagnetic superexchange propagated by the di-µ-chloro linkage in 2b. The latter result is rationalised on the basis of the specific geometric findings for this di-µ-chloro linkage, in particular the unusually large Ni–Cl–Ni angle [101.37(4)°]. |
| Databáze: | OpenAIRE |
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