Synthesis and crystal structure of two new heteropolynuclear [NiIICdIICdIINiII] and [NiIICdIINiII] Schiff base complexes involving bridging chlorine and oxygen functions

摘要: Abstract Two new heteropolynuclear Schiff base complexes, [Ni2Cd2L2Cl2(μ-Cl)2] (1) and [Ni2CdL′2Cl(H2O)]ClO4·H2O (2) where L = [N,N′-bis(2-hydroxyacetophenylidene)]propane-1,2-diamine L′ = [N,N′-bis(2-hydroxypropiophenylidene)]propane-1,2-diamine, have been synthesized by refluxing equimolar amounts of nickel perchlorate, cadmium chloride the respective tetradentate ligand, H2L or H2L′ in methanol medium. The complexes characterized microanalytical, spectroscopic, single crystal X-ray diffraction other physicochemical studies. Structural studies on 1 reveal presence a bis(heterodinuclear) [NiIICdII]2 unit which two central ions are doubly chloro-bridged with each them is connected to nickel(II) center through phenolate oxygen bridges. In contrast, complex 2 contains heterotrinuclear [NiIICdIINiII] ion centers bridging atoms. Cd(II) adopt distorted, square pyramidal (CdO2Cl3) octahedral (CdO5Cl) geometries respectively. On hand, Ni(II) both assume same coordination geometry, i.e. distorted planar (NiO2N2) arrangement. Intermolecular C–H⋯Cl O–H⋯Cl O–H⋯O hydrogen bonding interactions operative build up 2D supramolecular structures their solid states.