Complexes Of Cd And Zn With 8-Aminoquinoline Ligands: Synthesis, Crystal Structure And Electronic Spectroscopies

In this dissertation,four new complexes,CdL₂X₂[L= 8-Aminoquinoline,X=ClO₄^-(1),SCN^-(2),N₃^-(3)]and ZnL₂(SCN)₂(4), were synthesized and characterized by elemental analyses(C,H and N) and IR spectra.The crystal structure of 1 was determined which shows that the Cd(â…¡)ion exhibits a distorted octahedron coordination environment,namely,four coordinated nitrogen atoms from two 8-Aminoquinoline ligands construct the equatorial plane and two oxygen atoms from two ClO₄^- anions occupy in the axial positions with longer Cd-O distances(＞2.4(?)).Four complexes exhibit photoluminescence property in both solid state and solutions,and the emission spectra of these four complexes have similar feature,that is,only one broaden emission band without resolved fine structure,moreover,the central position of the emission band for each complex has a little difference from each other.As a result,this broaden emission band should be assigned to the transition ofπ←π^* in the molecule of 8-Aminoquinoline ligand,and the counter anion is not influence on the electronic structure of ML₂²⁺unit.The UV-visible absorption and fluorescence spectra for the four complexes in DMF, MeOH,MeCN,Py and CHCl₃ solution were also performed,which show the emission band is independent on the metal ions and counter anions due to ML₂X₂ molecles are disassociated into ML₂²⁺and X^- ions in diluted solution(M(â…¡)= Cd(â…¡)and Zn(â…¡); X^-=ClO₄^-,SCN^- and N₃^-).The influence of solvent properties on the electronic spectra is so complicated that no any clear relationship between them was found.