Research Article 1- Inorganic Chemistry

SYNTHESIS OF A NOVEL COPPER (II) COMPLEX THAT SHOWS REMARKABLE AFFINITY FOR SILVER (I) IONS.

A.M.K.S.PRABHATH ADHIKARI, M.Y.UDUGALA-GANEHENEGE*;
Department of Chemistry, Faculty of Science, University of Peradeniya.

ABSTRACT

A novel blackish nanostructured complex of copper(II) coordinated to both dithiooxamide (rubeanic acid) and acetyl acetone has been synthesized by template synthesis. The complex is extremely insoluble in almost all the solvents so that infrared (IR) data, X-ray diffraction (XRD) data, hardness measurements and melting points were used to characterize the complex. Measurements revealed that the melting point is above 280 ºC and hardness is in between 2.5 and 3 in the Mohs scale. The calculated particle size based on the XRD data of the complex is 13.2 nm and is less than that of dithioxamido complex of Copper(II). IR data of the complex indicate the increase in N-H frequencies in metalloderivative compared to the free dithiooxamide by 100 cm-1revealing the N-end of dithiooxamide is primarily bonded to the metal center. An ion-exchange study shows a remarkably specific affinity of the complex only for Ag+ ions and not for Pb(II), Cd(II), Ni(II) and Zn(II) ions. Atomic absorption spectroscopic(AAS) analysis of the effluent collected by passing a solution of Ag(I) ions through a column packed by the copper(II) complex shows a trapping of Ag(I) ions followed by a release of Cu(II) ions. These results demonstrate the application of the complex for specific trapping of some noble ions only.

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