PREPARARION, INVESTIGATION INTO MASS SPECTRA AND LUMINESCENCE OF DIME BENZOATE COMPLEXES OF Nd(III), Sm(III), Eu(III), Gd(III)

Abstract

   Some benzoate complexes of rare earth elements  with the general formula [Nd2(Benz)6].3H2O; [Ln2(Benz)6].H2O (Ln: Sm, Eu) and [Gd2(Benz)6] (Benz: Benzoate) have been prepared. The ion fragments and luminescence properties of complexes in solid state were investigated by measuring the mass, excitation and emission spectra, the intramolecular ligand-to-rare earth energy transfer mechanisms were discussed. The mass spectra of complexes displayed complexes are dimes and there are six ion fragments in vapour. The emission spectra of the Nd(III) and Gd(III) complexes displayed only one narrow band arising from4 4 3/2 9/2 F I  and 6 8 7/2 7/2 P S  respectively.  The emission spectrum  of the Eu (III)  complex displayed  five bands arising from 5 7 0 1 D F  , 5 7 0 2 D F  , 5 7 0 3 D F  ,  5 7 0 4 D F  ,5 7 0 5 D F  transitions;  On the other hand the emission spectrum  of the Sm (III)  complex displayed  five bands arising from4 6 7/2 5/2 F H  , 4 6 5/2 5/2 G H  , 4 6 5/2 7/2 G H  , 4 6 5/2 9/2 G H  , 4 6 5/2 11/2 G H  transitions.

Keywords: complex, rare earth, benzoic  acid, o-phenantroline.