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    STUDIA PHYSICA - Issue no. 2 / 2001  
         
  Article:   SPECTROSCOPIC AND MAGNETIC INVESTIGATION OF ONE CU(II) -DIKETONATE COMPLEX.

Authors:  L. DAVID, VASILE CHIŞ, R. TETEAN. 		 
       
         
  Abstract:  The copper(II) -diketonate complex CuL2, where L = H5C6COCHCOOC2H5 was investigated by spectroscopic (FT-IR, UV-VIS, EPR) and magnetic methods. The splitting of the s(C O) band from the FT-IR spectrum of the LH ligand (1576 cm1) in two bands at 1510 and 1560 cm1 in the FT-IR spectrum of the complex and the coalescence of as(C O) bands which appears at 1602 and 1622 cm1 for the ligand in a single red-shifted band at 1583 cm1 for the complex indicate the coordination of the Cu(II) ion to the carbonyl oxygen atoms of -diketonate molecules. The visible electronic spectrum of the CuL2 complex contains the broad absorption bands corresponding to the (B1gB2g) = 13075 cm1 and (B1g  Eg) = 15410 cm1 transitions for Cu(II) ion in D4h local symmetry. In the UV region the intraligand -* transitions (40557, 35934 and 32600 cm1) and the L  Md band (45567 cm1) appear. The powder EPR spectrum of the complex is rhombic, with g1 = 2.167, g2 = 2.082 and g3 = 2.004. The low g values arise from the delocalization of the unpaired electron in the chelate rings and from some molecular packing effects.  
         
     
         
         
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