Complexes of 2- and 4-vinylpyridines with cobalt(II) and nickel(II) halides and pseudohalides
- 1 January 1974
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 3,p. 272-277
- https://doi.org/10.1039/dt9740000272
Abstract
Complexes of cobalt(II) and nickel(II) with 2-vinylpyridine (2-vpy) and 4-vinylpyridine (4-vpy) exhibit various stereochemistries according to their stoicheiometry and the anion X present: octahedral, M(4-vpy)4X2(M = Co, Ni; X = Cl, Br, I, NCO, NCS); polymeric octahedral, M(4-vpy)2X2[M = Co, X = Cl (mauve-form), N3; M = Ni, X = Cl, Br, N3, NCS]; and tetrahedral, Co(4-vpy)2X2(X = Cl, Br, I) and Co(2-vpy)2X2(X = Cl, Br, I, NCS). Structures have been assigned from the electronic, i.r., and far-i.r. spectra, and magnetic behaviour of the complexes. In several cases the assigned structures have been confirmed by X-ray powder investigations. The complexes M(4-vpy)2(N3)2 are antiferromagnetic while the complexes Ni(4-vpy)2X2(X = Cl, Br) are weakly ferromagnetic.Keywords
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