Effect of the solvent on the formation of new oxovanadium(IV) complexes with pentafluorobenzoate anions and 1,10-phenanthroline

Depending on the solvent ratio MeCN: EtOH, the reaction of [VO(H2O)5](otf)2 (otf = O3SCF3) with 1,10-phenan-throline (phen) and lithium pentafluorobenzoate (Li(O2C2C6F5) = Li(pfbz)) affords crystals of heteronuclear compound [Li2(VO)2(mu-pfbz)6(phen)2]center dot 2MeCN (1), mononuclear complex [VO(pfbz)(phen)2](otf) (2) and binu-clear complex [(VO)2(mu-OH)(mu-pfbz)2(phen)2](otf)center dot MeCN center dot H2O (3). The structures of new compounds 1-3 were determined by X-ray diffraction. According to magnetochemical and EPR spectroscopy data, the paramagnetic VIV centers in structures 1 and 2 are magnetically isolated, and in compound 3, spin-spin antiferromagnetic exchange interactions between vanadium ions are realized (J = -138 cm- 1).