dinuclear copper(ii) complex of containing n,n-diisopropyl,n’-3-propylamide-ethylenediamine, and dihydroxo bridge; solvatochromic and thermochromic

The synthesis and characterization of a dinuclear [lcu(μ-oh)2cul](clo4)2, complex with a tridentate n,n-diisopropyl,n’-3-propylamide-ethylenediamine hemilabile ligand (abbreviated l) is reported. the dinuclear complex was characterized by elemental analysis, molar conductance, thermal analysis, and spectral studies. in the complex, both copper centers are 5-coordinated and bridged through two hydroxo groups.thermo- and solvatochromic behaviors of the complex were investigated by visible spectroscopy. its reversible thermochromism (blue ↔ green) in acetonitrile solution is due to dissociation and re-coordination of cu-o(amide) moiety. the solvent-dependent absorption maxima, λmax, was studied by a stepwise multiple linear regression (smlr) analysis to determine the best model describing the resulting positive solvatochromism.  the statistical results demonstrated that among different solvent parameters, donor number (dn) is a dominant parameter that is responsible for the redshift in the d-d absorption band of the complex by increasing its values.