J. Ranford, J. Vittal, Y. Wang
Feb 26, 1998
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Inorganic Chemistry
Abstract
Salicylaldehyde hydrazones derived from acyldicarboxylic acids (H4Ln, where n = 0, 1, 2, 4, 6, 8, 10, 14 and is the number of methylene units) of varying chain length have been prepared, and their dicopper(II) complexes have been isolated as bis analogues of antitumor carboxylate hydrazones. The predominant structural form adopted is polymeric, with [{Cu2Ln}m] formed in neutral or basic solution, [{Cu2(H2Ln)Cl2}m] from dilute HCl, and [{Cu2(H2Ln)}m]·(ClO4)2m from dilute HClO4. The crystal structures of [Cu2(H2L1)(H2O)2]·(ClO4)2·3H2O and [{Cu2(H2L4)(C2H5OH)2}m]·(ClO4)2m·m(C2H5OH) have been determined. The structure of [Cu2(H2L1)(H2O)2]· (ClO4)2·3H2O consists of discrete di-Cu(II) molecules with nonsymmetry-related Cu(II) centers. The copper atoms are square-planar with H2L1 supplying two tridentate, monoanionic ONO domains and water completing the coordination sphere. The two metal-binding domains are inclined at 80° to each other. For [{Cu2(H2L4)(C2H5OH)2}m]·(ClO4)2m·m(C2H5OH) the symmetry-related copper ...