Photophysical characteristics of Eu(III) 1,3-diketonates with substituted 1,10-phenanthroline auxiliary moieties: Experimental and theoretical approach

Abstract

A fluorinated β-diketone ligand 4,4,4-trifluoro-1-(2-furyl)-1,3-butanedione (TFFB was utilized as main sensitizer for preparing a series of luminescent Eu(TFFB)3X [X= auxiliary moiety] complexes. The 1H NMR spectra were found to be in accordance with the formation of 8 coordinated mononuclear complexes. Theoretically determined probability amplitude distributions have also supported the structural environment around Eu(III) cation as estimated from spectroscopic studies. In the absorption patterns, broad band corresponding to absorption by chromophoric units was observed. Upon UV excitation, emission patterns of complexes evince sharp peaks ascribed to transitions of europium(III) cation. The photophysical characteristics viz., energy level diagram, the radiative lifetimes (τ), and Judd-Ofelt (JO) intensity parameters of complexes were calculated. The complexes might be employed as a promising emissive material while creating displays.