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Titolo:
Mono- and bimetallic lanthanide(III) phenolic cryptates obtained by template reaction: solid state structure, photophysical properties and relaxivity
Autore:
Platas, C; Avecilla, F; de Blas, A; Rodriguez-Blas, T; Geraldes, CFGC; Toth, E; Merbach, AE; Bunzli, JCG;
Indirizzi:
Univ Lausanne, Inst Inorgan & Analyt Chem, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 CH-1015 Lausanne, Switzerland Univ Coruna, Dept Quim Fundamental & Ind, A Coruna 15071, Spain Univ Coruna A Coruna Spain 15071 undamental & Ind, A Coruna 15071, Spain Univ Coimbra, Fac Ciencias & Tecnol, Dept Bioquim, P-3000 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3000 t Bioquim, P-3000 Coimbra, Portugal Univ Coimbra, Ctr Neurociencias, P-3000 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3000 ociencias, P-3000 Coimbra, Portugal
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 4, , anno: 2000,
pagine: 611 - 618
SICI:
0300-9246(2000):4<611:MABLPC>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL-STRUCTURE; RARE-EARTH; MACROCYCLIC COMPLEXES; LUMINESCENCE; METAL; NMR; LIGANDS; RELAXATION; PYRIDINE; ND3+;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Rodriguez-Blas, T Univ Lausanne, Inst Inorgan & Analyt Chem, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 Switzerland
Citazione:
C. Platas et al., "Mono- and bimetallic lanthanide(III) phenolic cryptates obtained by template reaction: solid state structure, photophysical properties and relaxivity", J CHEM S DA, (4), 2000, pp. 611-618

Abstract

We report here a structural and photophysical study of lanthanide monometallic complexes with the macrobicyclic axial phenolic cryptand N[(CH2)(2)N=CH-R-CH=N(CH2)(2)](3)N (R=m-C6H2OH-2-Me-5) L as well as of bimetallic complexes with its de-protonated form (L-3H)(3-). The X-ray crystal structure of [DyL(NO3)](NO3)(2). 2CH(3)CN . 0.5H(2)O shows the metal ion being asymmetrically positioned into the macrobicyclic cavity and bonded to seven donor atoms of L and two oxygen atoms of a bidentate nitrate ion. The X-ray crystalstructure of the bimetallic cryptate, [Dy-2(L-3H)(NO3)(2)](NO3). 3H(2)O . MeOH, confirms that both Dy(III) ions are held into the cavity of the cryptand at a very short distance from each other, 3.4840(4) Angstrom. High resolution laser-excited emission spectra of the crystalline monometallic Eu(III) cryptate point to the presence of a single site with low symmetry for the metal, while lifetime measurements in H2O and D2O solutions allowed us toestimate the number of bound water molecules, q=1. Both mono- and binuclear Yb(III) cryptates display strong emission upon excitation through the ligand electronic levels, the spectrum of the binuclear complex being consistent with the presence of two Yb(III) ions in different co-ordination environments. Proton NMRD profiles for the mononuclear Gd(III) complex have been measured in the temperature range 5-37 degrees C and show that the relaxivity is mainly limited by fast rotation; this compound is stable towards acid-catalysed decomposition in aqueous solution only at pH > 5.5.

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Documento generato il 27/11/20 alle ore 07:26:46