Coordination compounds of europium(III), terbium(III), dysprosium(III), samarium(III), and gadolinium(III) with 2-acetylbenzoic acid

• Published in: Russian journal of inorganic chemistry Vol. 58; no. 7; pp. 773 - 776
• Main Authors: Pikula, A. A., Kolechko, D. V., Panyushkin, V. T., Oflidi, A. I., Nazarenko, M. A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-07-2013
• Subjects: Carboxyl group; Chemistry; Chemistry and Materials Science; Complexation; Coordination Compounds; Infrared; Infrared radiation; Inorganic Chemistry; Luminescence; Spectra; Spectroscopy; Thermogravimetry; Terbium; Luminescence Excitation Spectrum; Luminescence Time; Bidentate Coordination; Muriatic Acid
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023613070188

LnAcbenz
3
· 3H
2
O complexes of Eu
3+
, Tb
3+
, Dy
3+
, Sm
3+
, and Gd
3+
with 2-acetylbenzoic acid (HAcbenz) have been synthesized. The complexes have been studied by thermogravimetry and infrared and luminescence spectroscopy. According to IR spectroscopy data, the complexation of Acbenz
−
with lanthanide ions occurs due to the bidentate coordination of carboxyl groups. According to thermal analysis, the complexes are dehydrated at a temperature above 140°C, and their thermodestruction begins at a temperature above 250°C. From the luminescence spectra measured at 77 and 300 K, it has been established that the integral luminescence intensity of EuAcbenz
3
· 3H
2
O and TbAcbenz
3
° 3H
2
O is, respectively, 10 and 19 times higher than for tris-benzoates of the same metals. TbAcbenz
3
° 3H
2
O, the most intensively luminescing complex, is recommended for use as a promising luminescent material.