Abstract
Three mononuclear copper(II) complexes, [Cu(L1)(DMF)]ClO4 (1), [Cu(L2)(DMSO)]ClO4 (2) and [CuL3(NCO)] (3) (where HL1 {2-[(2-methylamino-ethylimino)-methyl]-4-nitro-phenol}, HL2 {2-[(2-ethylamino-ethylimino)-methyl]-4-nitro-phenol} and HL3 {2-[(2-(dimethylamino)ethylimino)methyl]-4-nitrophenol} are tridentate Schiff-base ligands), have been synthesized and characterized by elemental analysis, IR and UV–Vis spectroscopy and single-crystal X-ray diffraction studies. All the complexes are square planar. Complex 1 crystallizes in the triclinic space group, P1¯, with cell dimensions a=8.0396(2), b=9.0892(2), c=12.9977(3)Å, α=85.591(1)°, β=84.198(1)° and γ=76.423(1)°, whereas complex 2 crystallizes in the orthorhombic space group, Pbca with cell dimensions a=8.4615(4), b=17.2708(11) and c=25.8517(12)Å. Complex 3 crystallizes in the monoclinic space group, P21/n with cell dimensions a=6.9550(3), b=13.2257(7), c=14.7755(6)Å and β=102.697(3)°. Both HL1 and HL2 are capable of forming H bonds due to the presence of H atoms in their amine groups. On the other hand, HL3 cannot form H-bonds. The weak forces like H-bonding, lone pair⋯π and π⋯π interactions lead to various supramolecular architectures in the complexes.
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