Coordination polymers of Cu(II) and Cd(II) with bifunctional chelates of the type dipicolylamino-alkylcarboxylate, (NC5H4CH2)2N(CH2)nCO2H (n = 1, 2, 3 and 4) |
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Authors: | Mark Bartholomä |
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Institution: | Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States |
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Abstract: | A series of bifunctional chelates of the type dipicolylamino-alkylcarboxylate (NC5H4CH2)2N(CH2)nCO2H (n = 1-4; HL1-HL4, respectively) has been prepared. Reactions of the ligands in aqueous methanol/N,N-dimethylformamide with the appropriate Cu(II) salts yielded the compounds CuL1](NO3)·H2O (1·H2O), CuL2(H2O)]BF4·H2O (2·H2O), Cu(HL3)(SO4)]2 (3) and CuL4(NO3)]·MeOH (4·MeOH). While compounds 1, 2 and 4 are one-dimensional, the detailed connectivities within the chains are quite distinct, depending on factors such as alkyl chain length and ligation of aqua ligands or anionic components. In contrast to 1, 2 and 4, the structure of 3 is molecular, a binuclear assembly of edge-sharing Cu(II) ‘4+2’ distorted octahedra. The Cd(II) species, {CdL2}2(SO4)]·4H2O (5·4H2O), prepared from HL2 and CdSO4·nH2O in aqueous methanol/N,N-dimethylformamide, is two-dimensional, with a network constructed from binuclear units of seven coordinate Cd(II), , linked through bridging SO42− groups to produce an assembly of linked hexagonal rings {CdL2}2(SO4)]6. |
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Keywords: | Coordination polymers Bifunctional chelates One-dimensional Cu(II) compounds two-dimensional Cd(II) coordination polymers |
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