3 years ago

Random bimetallic NiIIxMnII1−x chains with mixed azido and carboxylato triple bridges: A gradual ferromagnetic-to-antiferromagnetic evolution

Random bimetallic NiIIxMnII1−x chains with mixed azido and carboxylato triple bridges: A gradual ferromagnetic-to-antiferromagnetic evolution
A series of isomorphous random bimetallic NiII-MnII compounds with N-methylpyridinium-4-carboxylate (4-mpc) and azide, have been synthesized and characterized. They are of formula [NiII xMnII 1−x(N3)2(4-mpc)] (16), (x =1 (1), 0.86 (2), 0.83 (3), 0.71 (4), 0.56 (5), 0.47 (6)). Compounds 16 consist of one-dimensional uniform chains with [(μ-EO-N3)2(μ-COO)] triple bridges (EO=end-on). Magnetic measurements reveal that compounds 16 behave as antiferromagnets with a gradual ferromagnetic-to-antiferromagnetic evolution by the incorporating of isotropic MnII ions into NiII chain. The NiII-rich compounds 13 exhibit field-induced metamagnetism. And the T N of the heterometallic compounds exhibit a composition-dependence of the content of NiII.

Publisher URL: www.sciencedirect.com/science

DOI: S0020169317314330

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