Binding Features of M(3d)(cbdc)2 Blocks (M(3d)=VIVO, CuII; cbdc2-=Dianion of Cyclobutane-1,1-Dicarboxylic Acid) in Formation of Heterometallic Structures with d-Metal Cationsстатья
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Аннотация:Compounds containing bis-chelate dianionic blocks {M(3d)
(cbdc)2}2– (M(3d)=VIVO, CuII) 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 (MnII, CoII, NiII, ZnII, and CdII)
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)=
VIVO, whereas in the case of the bis-chelate block with the CuII
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.