Binding Features of {M(3d)(cbdc)2 } Blocks (M(3d)=VIV O, CuII ; cbdc2- =Dianion of Cyclobutane-1,1-Dicarboxylic Acid) in Formation of Heterometallic Structures with d-Metal Cations

Compounds containing bis‐chelate dianionic blocks {M(3d)(cbdc)₂}^2– (M(3d)=V^IVO, Cu^II) with cations VO²⁺ and Cu²⁺ chelated by two anions of dicarboxylic acid have been prepared as crystals when aqueous solutions of vanadyl sulfate VOSO₄⋅3H₂O or copper sulfate CuSO₄⋅5H₂O have been allowed to react with sulfates of d‐metals (Mn^II, Co^II, Ni^II, Zn^II, and Cd^II) and barium salt of cyclobutane‐1,1‐dicarboxylic acid (H₂cbdc=C₄H₆(CO₂H)₂) in the 1:1:2 ratio. The nature of the M(3d) metal center has been found to influence on the structure of the heterometallic compounds formed. 1D polymers [M(VO)(cbdc)₂(EtOH)₂(H₂O)₃]_n (M=Mn (1), Co (2), Ni (3)), molecular dinuclear complex [Zn(VO)(cbdc)₂(H₂O)₅]⋅H₂O (4), and 1D polymer {[Cd(VO)(cbdc)₂(H₂O)₅]⋅H₂O}_n (5) are formed when M(3d)=V^IVO, whereas in the case of the bis‐chelate block with the Cu^II atom, ionic compounds [M(H₂O)₆][Cu(cbdc)₂(H₂O)] (M=Mn (6), Co (7), Ni (8), Zn (9)) and 2D polymer {[CdCu(cbdc)₂(H₂O)₂]⋅2H₂O}_n have been synthesized. The isolation of paramagnetic centers in compounds 1–10 is confirmed by magnetic measurements and EPR spectroscopy.