Cyanide-Bridged Cr^IIIMn^IIBinuclear Complexes Based on [Mn(phen)₂]²⁺and Dicyanidechromate(III) Building Blocks: Syntheses, Crystal Structures, and Magnetic Properties

Abstract

were obtained based on Mn(phen) 2 Cl 2 and a series of dicyanidechromate(III) building blocks. Single crystal X-ray diffraction analysis shows the structures of the three complexes are dimeric type with two different metal centers linked by a cyanide group from corresponding dicyanidechromate(III) building block. Magnetic investigations indicate the existence of relatively weak antiferromagnetic coupling between Cr(III) and Mn(II) ions with best-fit constants J CrMn = -2.78(5) cm -1 for 1, J CrMn = -3.02(2) cm -1 for 2 and J CrMn = -2.27(3) cmfor 3 based on the spin exchange Hamiltonian = -2J CrMn Cr Mn . The magneto-structural correlation of cyanide-bridged Cr III MnII complexes has been discussed at last.

Syntheses and crystal structures of four cyanide-bridged trinuclear iron(III)–copper(II)–iron(III) complexes exhibiting abnormal antiferromagnetic coupling

“…In addition, the magneto-structural correlation is one of the most basic scientific problems in the field of molecular magnetism. To date, the magneto-structural correlations of some cyanide-bridged heterometallic magnetic systems such as Fe III -Ni II and Cr III -Ni II and Cr III -Mn II systems have been elucidated qualitatively and quantitatively based on orbital overlap theory, theoretical calculations and experimental fitting [19,22,23]. For cyanide-bridged Fe ICu II systems with the simplest unpaired electron structure, the reported magnetic interactions are nearly all ferromagnetic except only one as an open question [16].…”