Influence of ligand architecture on the structure of coordination centre in dimeric europium carboxylates with 1,10-phenanthroline  

作　　者：V.Tsaryuk K.Lyssenko K.Zhuravlev V.Zolin V.Kudryashova I.Pekareva Z.Klemenkova 

机构地区：[1]Laboratory of Molecular Electronics, V.A.Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences 1 Vvedenskii sq., Fryazino Moscow Reg., 141190 Russia [2]A.N.Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences 28 Vavilov st., Moscow, 119991 Russia

出　　处：《Journal of Rare Earths》2009年第4期539-543,共5页稀土学报（英文版）

基　　金：supported by the Russian Foundation for Basic Research (N 08-02-00424-a, N 06-03-32557-a)

摘　　要：Methods of optical spectroscopy and X-ray crystallography data were used to examine the effect of architecture of carboxylate anions on structure of the Eu3＋ coordination centre in europium earboxylates with 1,10-phenanthroline Eu（RCOO）3·Phen. Luminescence spectra of europium acetate, nitropropionate, benzoate, naphthylcarboxylates, phenylacetates, phenoxyacetate, triphenylpropionate were investigated. A few of europium carboxylates with 2,2＇-bipyridine Eu（RCOO）3·Bpy and europium salts Eu（RCOO）3·nH2O were also studied. Vibrational IR and Raman spectra of phenylacetate family were analyzed. The crystal structure of nitropropionate Eu（NO2C2H4COO）3·Phen was solved by X-my diffraction method. The predominant influence of steric hindrances on Eu^3＋ coordination centre was observed at increase of the size of aromatic flagment of carboxylate anions. It was demonstrated, that introduction of the methylene bridges between the carboxylic group and aromatic rings of ligand weakens the effect of steric factor.Methods of optical spectroscopy and X-ray crystallography data were used to examine the effect of architecture of carboxylate anions on structure of the Eu3＋ coordination centre in europium earboxylates with 1,10-phenanthroline Eu（RCOO）3·Phen. Luminescence spectra of europium acetate, nitropropionate, benzoate, naphthylcarboxylates, phenylacetates, phenoxyacetate, triphenylpropionate were investigated. A few of europium carboxylates with 2,2＇-bipyridine Eu（RCOO）3·Bpy and europium salts Eu（RCOO）3·nH2O were also studied. Vibrational IR and Raman spectra of phenylacetate family were analyzed. The crystal structure of nitropropionate Eu（NO2C2H4COO）3·Phen was solved by X-my diffraction method. The predominant influence of steric hindrances on Eu^3＋ coordination centre was observed at increase of the size of aromatic flagment of carboxylate anions. It was demonstrated, that introduction of the methylene bridges between the carboxylic group and aromatic rings of ligand weakens the effect of steric factor.

关 键 词：Eu^3＋ luminescence spectra vibrational spectra X-ray crystal structure CARBOXYLATE 1 10-PHENANTHROLINE rare earths 

分 类 号：O627.3[理学—有机化学]