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Synthesis and characterization of two novel isostructural polymeric 1D mono-halo-bridged octahedral copper (II) chains with a diaza-diamine ligand |
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| Authors: | Ambarish Ray William S Sheldrick Swastik Mondal Song Gao |
| Institution: | a Inorganic Section, Department of Chemistry, Jadavpur University, Kolkata 700 032, India b Ruhr-Universitat Bochum, Lehrstuhl fur Analytische Chemie, D-44780 Bochum, Germany c SSP Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India d College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, PR China |
| Abstract: | Two novel isostructural (Π = 0.0045, Iv = 93.292) one-dimensional mono-halo-bridged octahedral copper (II) polymeric complexes Cu(L)Cl]n(ClO4)n (1) and Cu(L)Br]n(ClO4)n (2) (L = 1,9-diamino-5-methyl-5-nitro-3,7-diazanonane) were prepared and characterized by CHN, IR, EPR and magnetic moment studies under a tetra coordinating (diaza-diamine type) ligand environment. The X-ray structure analysis indicates that in both 1 and 2, independent consecutive Cu(L)X]+ (X = Cl or Br) cations with crystallographic Cs symmetry propagate through the a glide plane of the orthorhombic space group Pnma to give the polymeric chain structure along the a axis. In 1, the Cu-Cl bond length is 2.740 which under bridging condition elongates to 3.024 and the bridging angle, Cu-Cl-Cu, is 164.9 while parameters for 2 are 2.961(2), 3.074(2) and 157.4(5), respectively. Each monomeric unit in both the complexes is under extensive intra and inter-molecular hydrogen bonding, leading to three dimensional structures. |
| Keywords: | Octahedral Copper (II) chloro and bromo bridged complexes Diaza-diamine Isostructural Polymeric 1D chains inter and intra molecular H-bonding |
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