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http://dx.doi.org/10.5012/bkcs.2011.32.8.2544

Cyanide-bridged Trinuclear and Ethylenediamine-bridged One-dimensional Cobalt(III)-Manganese(II) Complexes: Synthesis, Crystal Structures and Magnetic Properties  

Zhang, Daopeng (College of Chemical Engineering, Shandong University of Technology)
Zhang, Lifang (School of Chemical Engineering and Technology, China University of Mining and Technology)
Zhao, Zengdian (College of Chemical Engineering, Shandong University of Technology)
Ni, Zhonghai (School of Chemical Engineering and Technology, China University of Mining and Technology)
Publication Information
Bulletin of the Korean Chemical Society / v.32, no.8, 2011 , pp. 2544-2548 More about this Journal
Abstract
Two pyridinecarboxamide cobalt dicyanide building blocks and Mn(III) compounds have been employed to assemble cyanide-bridged heterometallic complexes, resulting in three trinuclear cyanide-bridged $Co^{III}-Mn^{II}$ complexes: $\{[Mn(MeOH)_4][Co(bpb)(CN)_2]_2\}{\cdot}2MeOH{\cdot}2H_2O$ (1), $\{[Mn(MeOH)_4][Co(bpmb)(CN)_2]_2\}{\cdot}2MeOH{\cdot}2H_2O$ (2) and $\{[Mn(DMF)_2(en)_2][Co(bpb)(CN)_2]_2\}{\cdot}2DMF{\cdot}H_2O$ (3) ($bpb^{2-}$ = 1,2-bis(pyridine-2-carboxamido)benzenate, $bpmb^{2-}$ = 1,2-bis(pyridine-2-carboxamido)-4-methyl-benzenate, en = ethylenediamine). Single crystal X-ray diffraction analysis shows their similar sandwich-like structures, in which the two cyanide-containing building blocks act as monodentate ligands through one of their two cyanide groups to coordinate the Mn(II) center. For complex 3, it was further linked into one-dimensional structure by ethylenediamine acting as bridges. Investigation of the magnetic properties of complex 3 reveals weak antiferromagnetic coupling between the neighboring Mn(II) centers through the bridging ethylenediamine molecule. A best-fit to the magnetic susceptibilities of complex 3 gave the magnetic coupling constant J = -0.073(2) $cm^{-1}$.
Keywords
Cyanide-bridged; Heterometallic complex; Crystal structure; Magnetic property;
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