Formation of Polynuclear Cadmium Pivalates in Exchange Reactions

Resumo

The exchange reaction of CdCl₂ ⋅ 2H₂O with KPiv affords cadmium(II) trimethyl acetate complexes (K[Cd₆(Piv)₁₂Cl] ⋅ 2MeCN (I), [K₂Cd₃(Piv)₈(H₂O)₆] (II), and [Cd(Piv)₂(Н₂О)₂] (III) as a mixture with complex II and [K₃Cd₂(Piv)₇(MeCN)₂]_n (IV) (HPiv is trimethylacetic acid). The exchange reaction of CdSO₄ ⋅ 8/3H₂O with Ba(Piv)₂ makes it possible to obtain complex III in a quantitative yield. Complex III can also be isolated by the recrystallization of {Cd(Piv)₂} from water. The recrystallization of complex III or {Cd(Piv)₂} from MeCN affords hexanuclear complex [Cd₆(Piv)₁₂(MeCN)₂] (V), which transforms into complex III upon recrystallization from water. All new compounds are characterized by the data of single-crystal X-ray diffraction analysis (CIF files CCDC no. 1572202–1572206), IR spectroscopy, and C,H,N analysis.