Abstract

Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4′-bpe)3(H2O)3(X) (4,4′-bpe = 4,4′-bipyridylethylene, M = Mn (1-X−), X− = ClO 4 − , NO 3 − , BF 4 − , I−, Br−; M = Co (2 −-X−), X− = ClO 4 − , NO 3 − ; M = Zn (3-X−), X− = NO3/−) were reported. Careful magnetic measurements on an oriented single crystal of 1-ClO 4 − determined the spin-flop magnetic phase diagram and some intrinsic parameters, such as the intralayer coupling J, the anisotropy field H A and the exchange field H E. Different anions can remarkably tune the magnetic properties of 1-X−, especially the critical fields of the spin-flop transition. Compound 2-ClO 4 − remained paramagnetic down to 2 K.

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