Design and construction of two rare aqua bridged copper (II) coordination polymers through mixed ligand strategy: Synthesis, characterization and single crystal X-ray structure determination of [Cu(2-iodobenzoate)2(β/γ-picoline)2(μ-H2O)]n

Abstract Reaction of hydrated copper (II) 2-iodobenzoate with β/γ-picoline in methanol:water mixture (4:1, v/v) yielded two rare aqua bridged zig-zag polymers [Cu(2-iodobenzoate) 2 (β-picoline) 2 (μ-H 2 O)] n ; 1 and [Cu(2-iodobenzoate) 2 (γ-picoline) 2 (μ-H 2 O)] n ; 2 . The newly synthesized complexes have been characterized by elemental analysis, FT-IR spectroscopy, UV–Vis spectroscopy and single crystal X-ray structure determination. Complex 1 crystallized in monoclinic crystal system with C2/c space group, and complex 2 crystallized in triclinic crystal system with P 1 ‾ space group. X-ray structure determination revealed the presence of 1-dimensional chains of constituent molecules running along a -axis in both complexes. Water molecules act as bridges between constituent molecules and hence play a crucial role in 1-dimensional chain propagation in zig-zag manner. Empty channels have been observed between the zig-zag chains of complexes. Non-covalent interactions interactions such as O–H⋯O, C–H⋯O and C–H⋯π have been observed, which play a decisive role in the stabilization of crystal lattices in both complexes 1 and 2 .