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Metal-betaine interactions. Part 17: A study of intradimer Cu · · · Cu distance variation in copper(II) betaine complexes containing [Cu2 (carboxylato-O,O′)4L2]n+ species

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Abstract

Four copper(II) complexes of betaines, [Cu2(BET)4Cl2][Cu(BET)2Cl2]Cl2 (2), [Cu2(pyBET)4Cl2]3[CuCl4]2Cl2 (3), [Cu, (pyBET)4 (H2O)2] (NO3)4 · 2H2O (4), and [Cu2(ppBET)4(H2O)2](ClO4)4 · 4H2O (5), (BET = Me3N+CH2COO−; pyBET = C5H5N+CH2COO−; ppBET=C5H5N+CH2CH2COO−), have been prepared and characterized by X-ray crystallography. These complexes all contain dimeric [Cu2 (carboxylato-O,O′)4L2] structures [basal Cu-O=1.955(4) ∼ 1.991(2), Cu ⋯ Cu=2.602(1) ∼ 2.759(1) Å] with the apical ligand L=Cl− in (2) and (3) [Cu-Cl=2.415(1) ∼ 2.436(3) Å] and L = H2O in (4) and (5) [Cu-OH2=2.158(4) ∼ 2.192(3) Å]; also present are a discrete [Cu(BET)2Cl2] molecule with a compressed tetrahedral CuO2Cl2 chromophore involving two unidentate carboxylate ligands [Cu-O=1.916(2), Cu-Cl=2.254(1) Å] in (2), and a discrete C3v [CuCl4]2− anion in (3). Generally the intradimer Cu ⋯ Cu distance may be correlated to the electronic repulsion of the metal-ligand bonds in the CuO4L chromophore, as well as the steric interaction between the carboxylate moieties and the apical ligand.

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  1. Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong

    Xiao-Ming Chen & Thomas C. W. Mak

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Chen, XM., Mak, T.C.W. Metal-betaine interactions. Part 17: A study of intradimer Cu · · · Cu distance variation in copper(II) betaine complexes containing [Cu2 (carboxylato-O,O′)4L2]n+ species. Struct Chem 4, 247–259 (1993). https://doi.org/10.1007/BF00673699

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