Spectral and DNA-binding properties of lanthanide complexes with tetradentate ligand

ABSTRACT

A series of lanthanide(III) complexes, having the general formula [LnH₂L (NO₃)₂]NO₃ (where Ln = La, Ce, Pr, Nd, Sm, and Eu; H₂L = N, N'-bis(2-hydroxy-1-naphthylidene)1,3-propylenediimine) have been synthesized and characterized based on elemental analysis, molar conductivity, infrared, UV–visible, cyclic voltammetry, powder X-ray diffraction, mass, and fluorescence studies. Molar conductivity data suggest that the complexes are 1:1 electrolytes. The infrared spectral data suggest that the ligand binds through azomethine nitrogen and naphtholic oxygen atoms. IR studies reveal that the complexes contain both coordinating and ionic nitrate ligands. Neodymium, samarium, and europium complexes exhibit luminescence property. DNA-binding properties of complexes are investigated using spectrophotometry.

KEYWORDS:

• Synthesis
• spectral characterization
• lanthanide (III) complexes
• cyclic voltammetry
• DNA-binding studies

Acknowledgments

One of the authors (Sriramula Vidyasagar Babu) is thankful to UGC, New Delhi for award of Post-Doctoral Research Fellowship F.31-11(SC)/2009(SA-III). The authors thank UGC and DST, New Delhi providing equipment facility under UGC-SAP and DST-FIST programmes. The authors also thank SSSIHL Deemed University, Prasanthi Nilayam for providing fluorescence spectral data.