Synthesis,Structure, and Luminescent Properties of Antimony(III) Complexes with N,N"-Diphenylguanidine

Complexes of antimony(III) halides with N,N"-diphenylguanidine were synthesized for the first time and studied using X-ray diffraction analysis and luminescence spectroscopy. The mechanism of sensitization of Sb³⁺luminescence involving the low-lying state of the charge transfer was proposed.     

Luminescence Spectral Properties of Europium(III) and Terbium(III) Complexes with Cinnamic Acid

Europium and terbium mixed-ligand complexes with cinnamic acid of composition Ln(Cin)₃· nD · xH₂O, where Ln = Eu³⁺or Tb³⁺, Cin is a cinnamate ion (C₆H₅CH=CHCOO^–), D = 1,10-phenantroline, 2,2"-dipyridyl, benzotriazole (n= 2, x= 0), triphenylphosphine oxide (n= 1, x= 2), or H₂O (n= 0 or 1, x= 0), were synthesized. The compounds were characterized by elemental analysis, IR and luminescence spectroscopy. The Stark structure of the ⁵ D ₀–⁷ F _j(j= 0, 1, 2) electronic transitions in the low-temperature luminescence spectra of europium complexes was analyzed. IR study has revealed a bidentate coordination of the cinnamate ion in the compounds.     

Influence of the Nature of Carboxylic Acid on the Luminescence and Spectral Properties of (Carboxylato)bis(dibenzoylmethanato)europium(III) Complexes

A series of (carboxylato)bis(dibenzoylmethanato)europium(III) complexes containing anions of both saturated and unsaturated carboxylic acids were synthesized to compare the luminescence and spectral properties of heteroligand Eu(III) complexes. (Carboxylato)bis(dibenzoylmethanato)europium(III) complexes with unsaturated acid anions were synthesized for the first time. The compounds obtained were characterized using elemental analysis and luminescence and IR spectroscopy. These studies revealed two types of influence of the nature of an acid substituent on the luminescence spectra of (carboxylato)bis(dibenzoylmethanato)europium(III) complexes. The anomalous Stark structure of the luminescence spectra of one group of compounds is attributed to the charge transfer state at 77 K.     

Effect of γ-substitution on the thermoluminescence properties of terbium (III) acetylacetonate complexes with 1,10-phenanthroline

The coordination compounds [Tb(NO₃)₂ acac(phen)₂]H₂O (where acac is acetylacetone or its derivatives substituted in the γ-position) were synthesized and studied by luminescence, IR, and UV spectroscopy. Thermoluminescence of the complexes containing acetylacetonate, 3-phenylthio-2,4-pentadioñate, and 3-(p-methoxyphenylthio)-2,4-pentadionate was found. The structural and electronic aspects of the crystal thermoluminescence were discussed.