Dinuclear complexes of europium(III) and gadolinium(III) ions with a julolidine–quinoline-based tridentate ligand

Abstract

2016): Dinuclear complexes of europium(III) and gadolinium(III) ions with a julolidine-quinoline-based tridentate ligand, Journal of Coordination Chemistry, ABSTRACTThe reaction of europium(III) or gadolinium(III) acetates with a Schiff base ligand {HL (C 22 H 21 N 3 O) = ((E)-9-((quinolin-8-ylimino)methyl)-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-8-ol)} in methanol affords two dinuclear complexes which have been characterized by powder X-ray diffraction, Raman spectroscopy, scanning electron microscope-electron dispersive spectroscopy, absorption and emission spectroscopies as well as single-crystal X-ray diffraction. [Eu 2 L 2 (CH 3 COO) 4 (CH 3 OH) 2 ] (1) and [Gd 2 L 2 (CH 3 COO) 4 (CH 3 OH) 2 ] (2) are iso-structures, each consisting of two M : L : CH 3 COO : CH 3 OH (1 : 1 : 1 : 1) units bridged by two acetate anions with the metal center in a distorted capped square antiprismatic coordination geometry. Their vibration modes, electronic structures, and photoluminescent properties are reported.