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Syntheses, Crystal Structure, and Magnetic Properties of a Self‐Assembling Dinickel(II) Helicate with Novel Bipyridine Ligand
Author(s) -
Wang WenJwu,
Wang YiChun,
Kao HsienChang
Publication year - 2010
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201000121
Subject(s) - chemistry , crystallography , ligand (biochemistry) , perchlorate , nickel , diffractometer , octahedron , 2,2' bipyridine , bipyridine , denticity , crystal structure , stereochemistry , ion , organic chemistry , biochemistry , receptor
A novel polydentate ligand, L = 2,2′‐bipyridyl‐6,6′‐bis(2‐acetylpyrazinohydrazone), was synthesized by condensation of 6,6′‐dihydrazine‐2,2′‐bipyridine and 2‐acetylpyrazine. Reaction of L ligand strands with nickel (II) perchlorate in CH 3 CN generates a double helical dinuclear complex. Its complexation behavior was studied by UV‐Vis spectrophotometric titration experiments that revealed the formation of dinuclear complexes [Ni 2 L 2 ](ClO 4 ) 4 . Moreover, the double‐helical structure of [Ni 2 L 2 ](ClO 4 ) 4 was confirmed by X‐ray diffractometer. Each nickel(II) center occupies a distorted octahedral environment. Variable‐temperature magnetic measurements revealed weak antiferromagnetic interactions between Ni(II) ion centers with J = −0.34 cm −1 .