Spectroscopic study of solvent effects on the electronic absorption spectra of morpholine and its complexes

The electronic absorption spectra of morpholine and its five complexes have been studied in different solvents various polarities. regression correlation coefficients calculated with the SPSS program. Solvation energy relationships were deduced from spectral shifts correlated solvent parameters α (solvent hydrogen bond donor acidity), β acceptor basicity), π* (dipolarity/polarizability). percentage contributions solvatochromic show that classic solvation effects play a major role explaining all investigated complexes. blue shift [Fe(MOR)3Cl3]·4H2O, [Ni(MOR)4Cl2]·4H2O, [Cu(MOR)4Cl2]·6H2O is due to formation bonds, which suggests stabilization ground state compared excited state. [CuNi(MOR)2Cl4]·4H2O [CuZn(MOR)3Cl4]·2H2O are mixed metal suffer red solute-solvent interactions, causes solute increasing polarity. bands affected by specific interactions including ability (acidity) (basicity) nonspecific electromagnetic interaction between dipole moments polar solvents.