New metal-organic complexes based on bis(tetrazole) ligands: Synthesis, structures and properties

In this paper, a series of new complexes, [Zn-2(HL1)(2)(H2O)(4)]center dot H2O (1), [Co-2(HL1)(2)]center dot TEA (2), [Co-3(HL1)(2)(H2L1)(2)(H2O)(4)](n) (3) [Cu(HL1)(H2O)(2)](n) (4) {[Cu-5 (HL2)(2)(OH)(4)(ClO4)(2)]center dot 4H(2)O}(n) (5) and [Cu-2(L-3)](n) (6) were successfully prepared by utilizing three bis(tetrazole) ligands [bis-(1H-tetrazol-5-ylmethyl)-amine (H3L1), bis-(1H-tetrazol-5-ylethyl)-amine (H3L2) and 1,5-bis(5-tetrazolo)-3-thiapentane (H2L3)], all of which have been characterized by elemental analyses, FT-IR spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analyses as well as single-crystal X-ray diffraction analyses showing different dimensionalities (0D, 1D and 3D). Complexes 1 and 2 are OD structures, 1 shows a dinuclear structure, 2 displays two crystallographically different mononuclear structures, 1 and 2 are further assembled to form 3D supramolecular framework and 2D supramolecular network by hydrogen-bonding interactions, respectively. Complexes 3, 4 and 5 are 1D structures, 3 features a mononuclear unit and a 1D chain, which are arranged into 3D supramolecular architecture by hydrogen-bonding interactions, 4 presents a zigzag chain, 5 shows an infinite chain structure constructed from pentanuclear Cu(II) subunits and ClO4- anions. Complex 6 exhibits a 3D coordination framework based on cyclic [Cu-4(L-3)(2)] dimmer subunits as nodes possessing an 8-connected network topology with the point symbol {4(24).6(4)}. Further, semiconductor behaviors, the solid-state luminescent properties of the complexes 1-3 and 6 were measured and studied seriously at room temperature. (C) 2016 Elsevier B.V. All rights reserved.