Crystal Structures of Compounds Obtained in Reactions of Heterometallic Pivalate Complexes With Dicarboxylic Acids

Resumo

In the reaction of a heterometallic complex of the composition [Li₂Zn₂(piv)₆(py)₂] (piv⁻ is the pivalate anion, py is pyridine) with 2,5-pyridinedicarboxylic acid (H₂pdc) and 4,4′-bipyridyl (4,4′-bpy), molecular complex [Zn(MeOH)₂(Hpdc)₂]·4,4′-bpy (1) is obtained. In the interaction of the same complex with another dicarboxylic acid (1,4-naphthalenedicarboxylic (H₂ndc)) and also in the presence of 4,4′-bipyridyl, heterometallic metal-organic framework (MOF) [{LiZn}₄(4,4′-bpy)(dmf)₂(ndc)₆]·3DMF·H₂O (2) is formed. In the interaction of a polymeric pivalate complex of the composition [Cd₂Eu(piv)₇(H₂O)₂]·nMeCN with thiophenedicarboxylic acid (H₂tdc), layered MOF (Me₂NH₂)₂[Cd(tdc)₂]·1.5DMF·H₂O is obtained (3). The structures of 1–3 are determined by single crystal X-ray diffraction. In the reactions studied, the structures of initial heterometallic {Li₂Zn₂} and {Cd₂Eu} moieties is partially retained only for MOF 2. This coordination polymer is of interest for the study of luminescent and sorption properties. In the other cases, the heterometallic unit is fragmented, which results in the formation of a final product involving only one of two metal cations contained in the initial unit.