Molecular cage, one-dimensional tube and two-dimensional polycatenane obtained from reactions of flexible tripodal ligand 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene with copper salts

摘要

Three novel copper complexes, [Cu-II(titmb)(N-3)(2)](.)0.5H(2)O (1), [Cu-3(I)(titmb)(2)](ClO4)(3) (2), and [Cu-II(titmb)(SO4)](.)2.2H(2)O (3), were obtained by reactions of flexible tripodal ligand 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene (titmb) with the corresponding copper(II) salts using hydrothermal method and their structures were determined by X-ray crystallography. Complex 1 exhibits a one-dimensional (1D) tube-like chain structure, while the 2 possesses a M3L2 molecular cage-like structure, in which the copper atom has a valence of +1, indicating that the Cu-II is reduced to Cu-I under the hydrothermal condition. Complex 3 has a polycatenated network structure with inclined interpenetration of (6,3) networks. Ligand titmb adopts a cis, cis, cis-conformation in all of the three complexes. The results indicate that the anions play important roles in the structure of the complexes. In addition, complex 2 was further investigated by electrospray massspectrometry.