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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

 
Title
Cyanide-bridged Trinuclear and Ethylenediamine-bridged One-dimensional Cobalt(III)-Manganese(II) Complexes: Synthesis, Crystal Structures and Magnetic Properties
Author
Daopeng Zhang, Lifang Zhang, Zengdian Zhao, Zhonghai Ni*,
Keywords
Cyanide-bridged, Heterometallic complex, Crystal structure, Magnetic property
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 CoIII-MnII complexes: {[Mn(MeOH)4][Co(bpb)(CN)2]2}·2MeOH·2H2O (1), {[Mn(MeOH)4][Co(bpmb)(CN)2]2}·2MeOH·2H2O (2) and {[Mn(DMF)2(en)2][Co(bpb)(CN)2]2}·2DMF·H2O (3) (bpb2− = 1,2-bis(pyridine-2-carboxamido)benzenate, bpmb2− = 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.
Page
2544 - 2548
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