Abstract
The imidazolyl ligands, bis(N-imidazolyl)methane (L1) and 1,4-bis(N-imidazolyl)butane (L2) reacted with Zn(II), Cu(II), and Ni(II) salts of carboxylic acids resulting in the formation of five metal–organic coordination architectures, [Zn(L1)(CO3)] · H2O (1), [Cu(L2)(cnic)2] · H2O (2) (cnic = 2-chloronicotinate), [Cu2(L2)2(adip)2] · 6H2O (3) (adip = adipate), [Ni(mal)(L1)(H2O)] (4) (mal = malonate), and [Ni3(ctc3 − )2(L1)6] · 35H2O (5) (ctc − = citrate). All complexes have been characterized by elemental analysis, infrared, TG, and X-ray diffraction analyses. The different coordination modes of the carboxylates due to their chain length and rigidity lead to a range of different coordination structures. All these complexes display 3-D framework structures with a number of non-conventional weak interactions. The carboxylates can adopt bridging μ 2, chelating μ 2, chelating-bridging μ 3, and chelating μ 3 coordination modes. The metals are coordinated in N2O2, N2O3, N2O4, N3O3, and N6 fashions depending on the metal and ancillary ligands. The frameworks of the five compounds are thermally stable.
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