Abstract
The four isolates solid complexes : [La(RHC)(NO3)(2)] center dot 3H(2)O, [Nd(RHC)(NO3)(2)] center dot 4H(2)O, [Eu(RHC)(NO3)(2)] center dot 2H(2)O, and [Ce(RHC)(NO3)(2)] center dot 5H(2)O that obtained by the reaction of the nitrate salts of the Ce(III), Eu (III), Nd (III) and La (III) ions and rhodamie C (RHC) ligand were interpretative using elemental analysis (C, H and N) molar conductivity, infrared, electronic, fluorescence and H-1-NMR spectra to achieve the speculated suitable formula. The low molar conductance values of the synthesized RHC complexes concluded the non-electrolytic behavior. The infrared spectra recorded the absence of stretching vibration nu(OH) of the -COOH and presence of two new vibration bands at 1 597 similar to 1601 and 1383 similar to 1 399 cm(-1) which were assigned to nu(as)(COO ) and nu(s) (COO). The difference between them revealed that the carboxylate group acts as a bidentate ligand. 1HNMR spectra of Europium and lanthanum(III) complexes were supported the FTIR results based on the absent of proton of the carboxylic group. Therefore, the microanalytical and spectroscopic results deduced that RHC acts as a monobasic bidentate ligand, and coordinated to the central metal (III) ions via the two oxygen atoms of deprotonated carboxylic group. Fluorescence studies were performed on the metal complexes of Ce3+, Tb3+, Th4+, Gd3+ and La3+, that referred a quenching in the fluorescene intensity of rhodamine C in the aqueous state after complexation. The antimicrobial assessment against some kind of bacteria and fungi were also checked and recorded enhancement in case of their complexes.