Influence of ligand architecture on the structure of coordination centre in dimeric europium carboxylates with 1,10-phenanthroline
来源期刊：JOURNAL OF RARE EARTHS2009年第4期
论文作者：Z.Klemenkova V.Kudryashova K.Lyssenko V.Zolin V.Tsaryuk I.Pekareva K.Zhuravlev
Key words：Eu3+; luminescence spectra; vibrational spectra; X-ray crystal structure; carboxylate; 1,10-phenantbroline; rare earths;
Abstract: 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 carboxylates 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-ray diffraction method.The predominant influence of steric hindrances on Eu3+ coordination centre was observed at increase of the size of aromatic fragment 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.
Z.Klemenkova1，V.Kudryashova2，K.Lyssenko1，V.Zolin2，V.Tsaryuk2，I.Pekareva2，K.Zhuravlev2
(1.A.N.Nesmeyanov Institute of Organoelement Compounds,Russian Academy of Sciences,28 Vavilov st.,Moscow,119991 Russia;
2.Laboratory of Molecular Electronics,V.A.Kotelnikov Institute of Radioengineering and Electronics,Russian Academy of Sciences,1 Vvedenskii sq.,Fryazino Moscow Reg.,141190 Russia)
Abstract: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 carboxylates 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-ray diffraction method.The predominant influence of steric hindrances on Eu3+ coordination centre was observed at increase of the size of aromatic fragment 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.
Key words:Eu3+; luminescence spectra; vibrational spectra; X-ray crystal structure; carboxylate; 1,10-phenantbroline; rare earths;
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