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Titolo:
Lanthanide triple helical complexes with a chiral ligand derived from 2,6-pyridinedicarboxylic acid
Autore:
Muller, G; Schmidt, B; Jiricek, J; Hopfgartner, G; Riehl, JP; Bunzli, JCG; Piguet, C;
Indirizzi:
Univ Lausanne, BCH, Inst Inorgan & Analyt Chem, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 CH-1015 Lausanne, Switzerland Novartis Pharma AG, Nervous Syst, CH-4002 Basel, Switzerland Novartis Pharma AG Basel Switzerland CH-4002 CH-4002 Basel, Switzerland Univ Hannover, Dept Organ Chem, D-30167 Hannover, Germany Univ Hannover Hannover Germany D-30167 n Chem, D-30167 Hannover, Germany F Hoffmann La Roche & Co Ltd, Div Pharmaceut, CH-4070 Basel, Switzerland FHoffmann La Roche & Co Ltd Basel Switzerland CH-4070 asel, Switzerland Univ Minnesota, Dept Chem, Duluth, MN 55812 USA Univ Minnesota Duluth MN USA 55812 esota, Dept Chem, Duluth, MN 55812 USA Univ Geneva, Dept Inorgan Analyt & Appl Chem, CH-1211 Geneva 4, Switzerland Univ Geneva Geneva Switzerland 4 ppl Chem, CH-1211 Geneva 4, Switzerland
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 18, , anno: 2001,
pagine: 2655 - 2662
SICI:
1472-7773(20010921):18<2655:LTHCWA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PREDETERMINED PROPERTIES; BUILDING-BLOCKS; EUROPIUM(III) COMPLEXES; BINDING UNITS; LUMINESCENCE; ENHANCEMENT; TRANSITION; EXCITATION; SEARCH; IONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Bunzli, JCG Univ Lausanne, BCH, Inst Inorgan & Analyt Chem, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 anne, Switzerland
Citazione:
G. Muller et al., "Lanthanide triple helical complexes with a chiral ligand derived from 2,6-pyridinedicarboxylic acid", J CHEM S DA, (18), 2001, pp. 2655-2662

Abstract

The ligand 3-[2,6-bis(diethylcarbamoyl)pyridine-4-yl]-N-(tert-butoxycarbonyl)alanine methyl ester (L-4) bearing a chiral group in the 4-position of the pyridine ring has been synthesised and its interaction with trivalent lanthanide ions studied. L-4 yields stable [Ln(L-4)(3)](3+) Complexes in acetonitrile, with log beta (3) in the range 19-20. The specific rotary dispersion of the complexes is about ten times as large as that of the ligand alone, consistent with triple helical structures in solution. NMR data show thepresence of only one time-averaged species in acetonitrile solution with atrigonal symmetry, that is, the helical P reversible arrowM interconversion is fast on the NMR time scale. Circularly polarised luminescence on the Eu and Tb triple helical complexes displays weak effects, pointing to only asmall diastereomeric excess in solution. High resolution luminescence spectra of the Eu complex in the solid state reveal a local symmetry derived from a trigonal arrangement around the metal ion and the long D-5(0) lifetime(1.58 ms) is indicative of the absence of water molecules bound in the inner co-ordination sphere. Energy transfer processes in the luminescent Eu and Tb triple helical complexes are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 11:37:09