US EPA

4270604 

Journal Article 

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

Zhang, D; Zhang, L; Zhao, Z; Ni, Z 

2011 

Yes 

Bulletin of the Korean Chemical Society
ISSN: 0253-2964
EISSN: 1229-5949 

32 

8 

2544-2548 

10.5012/bkcs.2011.32.8.2544 

WOS:000297383900006 

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)}center dot 2MeOH center dot 2H(2)O (1), {[Mn(MeOH)(4)][Co(bpmb)(CN)(2)](2)}center dot 2MeOH center dot 2H(2)O (2) and {[Mn(DMF)(2)(en)(2)][Co(bpb)(CN)(2)](2)}center dot 2DMF center dot H2O (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). 

Cyanide-bridged; Heterometallic complex; Crystal structure; Magnetic property