The Crystal Structure of the Cluster Complex [{Co(phen)2}2V4O12] · H2O

The crystal structure of [{Co(phen)₂}₂V₄O₁₂] · H₂O consists of hexanuclear bimetallic clusters [{Co(phen)₂}₂V₄O₁₂]. The cyclic [V₄O₁₂]^4‐ anion acts as a bidentate bridging ligand between the two [Co(phen)₂]²⁺ cations. The π‐π stacking interactions between the parallel 1,10‐phenantroline (phen) groups play a significant role in stabilizing this structure. The title compound crystallizes in the P2₁/c space group.     

Thermal properties of [MII(phen)3]2V4O12·phen·22H2O (M II=Co,Ni, Cu,phen=1,10-phenanthroline)

Thermal decomposition of three tetravanadates, [M^II(phen)₃]₂V₄O₁₂·phen·22H₂O, where M ^II is Co (1), Ni (2), Cu (3) and phen is 1,10-phenanthroline, was studied by dynamic method (for 1 and 2) or isothermally (for 3). The thermal decomposition of the studied compounds is a multi-step process which involve: discontinuous dehydration, release of uncoordinated, and of coordinated phenanthroline molecules. In course of the latter process, a phase transition of the cyclo-tetravanadates to polymeric metavanadates occurred. Metavanadates with chain structure of the anion were the final decomposition products of all tetravanadates studied. This revised version was published online in July 2006 with corrections to the Cover Date.