The Syntheses, Crystal Structure and Luminescence Properties of Cone-Like Octadentate Europium (III) Complexes with Four Short Alkoxy Substituents

Abstract

Treatment of 1-(4 -methoxy or ethoxy phenyl)-4,4,4-trifluoro-1,3-butanedione with europium (III) chloride in the presence of piperidine resulted in the halide ligands exchange yielded new piperidinium tetrakis{1-(4 -methoxy or ethoxy phenyl)-4,4,4-trifluoro-1,3-butanedionato} europate (III) complexes 2a and 2b. Complexes 2a and 2b have been characterized by elemental analysis, 1 H NMR spectroscopy, and FAB-MS, and their absolute structures were determined by single crystal X-ray diffraction analysis. The complexes 2a and 2b have the monoclinic space groups C2/c (No. 15, 4 -substituent = OCH 3 ) and with P − 1 (No. 2, 4 -substituent = OC 2 H 5 ), respectively. X-ray analysis results showed that eight coordinate structures of the complexes 2a and 2b have cone-like structures, like calix [4]arenes, but their structures were slightly different due to the crystal packing and the existence of the solvent molecule. The complexes 2a and 2b exhibited identical, strong photoluminescence emissions in the solution phase.

Syntheses, Crystal Structure and Photoluminescence Properties of Piperidinium Tetrakis (1,3-Diphenyl-1,3-Propanedionato) Europate(III) Complex and Its Two Different Crystals

“…Therefore, the excited energy on the f orbital ( 5 D levels) of the centered europium ion is effectively relaxed to 7 F levels only. Our recent research reported that the octa-coordinate homoleptic and heteroleptic europate (III) complexes carrying four bidentate ligands were synthesized and the structure of the homoleptic complex was unexpectedly cone-like by X-ray analysis without water molecule(s) as the ligand(s) [13]. The luminescent intensity of the complex was quite strong because the complex has no water ligand in solid and in solution.…”