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http://dx.doi.org/10.5012/bkcs.2012.33.5.1675

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

Li, Guo-Ling (School of Chemical Engineering and Technology, China University of Mining and Technology)
Zhang, Li-Fang (School of Chemical Engineering and Technology, China University of Mining and Technology)
Ni, Zhong-Hai (School of Chemical Engineering and Technology, China University of Mining and Technology)
Kou, Hui-Zhong (Department of Chemistry, Tsinghua University)
Cui, Ai-Li (Department of Chemistry, Tsinghua University)
Publication Information
Abstract
Three new cyanide-bridged $Cr^{III}Mn^{II}$ binuclear complexes, $[Mn(phen)_2Cl][Cr(bpmb)(CN)_2]{\cdot}H_2O$ ($\mathbf{1}$) (phen = 1,10-phenanthroline, $bpdmb^{2-}$ = 1,2-bis(pyridine-2-carboxamido)-4-methyl-benzenate), $[Mn(phen)_2Cl][Cr(bpmb)-(CN)_2]{\cdot}H_2O$ ($\mathbf{2}$) ($bpdmb^{2-}$ = 1,2-bis(pyridine-2-carboxamido)-4,5-dimethyl-benzenate), and $[Mn(phen)_2Cl]-[Cr(bpClb)(CN)_2]{\cdot}CH_3OH{\cdot}H_2O$ ($\mathbf{3}$) ($bpClb^{2-}$ = 1,2-bis(pyridine-2-carboxamido)-4-chloro-benzenate) were obtained based on $Mn(phen)_2Cl_2$ 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 $\mathbf{1}$, $J_{CrMn}=-3.02(2)cm^{-1}$ for $\mathbf{2}$ and $J_{CrMn}=-2.27(3)cm^{-1}$ for $\mathbf{3}$ based on the spin exchange Hamiltonian = $-2J_{CrMn}\hat{S}_{Cr}\hat{S}_{Mn}$. The magneto-structural correlation of cyanide-bridged $Cr^{III}Mn^{II}$ complexes has been discussed at last.
Keywords
Cyanide-bridged; Binuclear complex; Crystal structure; Magnetic property; Magneto-structural correlation;
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