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Titolo:
Stereospecific assembly of chiral Lambda-Cr(III)-Delta-Ln(III)-oxalato-bridged dinuclear 3d-4f complexes (Ln = Yb or Dy) and near infrared circular dichroism in the 4f -> 4f transitions
Autore:
Subhan, MA; Suzuki, T; Kaizaki, S;
Indirizzi:
Osaka Univ, Grad Sch Sci, Dept Chem, Osaka 5600043, Japan Osaka Univ Osaka Japan 5600043 Sch Sci, Dept Chem, Osaka 5600043, Japan
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 4, , anno: 2001,
pagine: 492 - 497
SICI:
1472-7773(2001):4<492:SAOCL>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANTHANIDE TETRAAMIDE COMPLEXES; F-BLOCK ELEMENTS; POLARIZED LUMINESCENCE; STRUCTURAL CHARACTERIZATION; OPTICAL-ACTIVITY; SPECTROSCOPY; DERIVATIVES; FREQUENCY; SPECTRA; IONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Kaizaki, S Osaka Univ, Grad Sch Sci, Dept Chem, Osaka 5600043, Japan OsakaUniv Osaka Japan 5600043 ept Chem, Osaka 5600043, Japan
Citazione:
M.A. Subhan et al., "Stereospecific assembly of chiral Lambda-Cr(III)-Delta-Ln(III)-oxalato-bridged dinuclear 3d-4f complexes (Ln = Yb or Dy) and near infrared circular dichroism in the 4f -> 4f transitions", J CHEM S DA, (4), 2001, pp. 492-497

Abstract

Stereospecific formation of the chiral heterodinuclear 3d-4f complexes (Lambda-Delta)-[(acac)(2)Cr(ox)Ln(HBpz(3))(2)] (acac(-)=acetylacetonate, ox(2-)=oxalato, HBpz(3)(-)=hydrotris(pyrazol-1-yl)borato; Ln=Yb: 1, Dy: 2 where (Lambda-Delta) implies the absolute configuration around the octahedral Cr and square antiprismatic Ln moiety, respectively) was demonstrated by comparing the near infrared circular dichroism (NIR CD) in the 4f --> 4f transitions and/or the single crystal X-ray analysis with those of a diastereomeric mixture of the mononuclear Lambda-, and Delta-[Yb(HBpz(3))(2)(S-pba)] 3 (S-pba=S-(+)-2-phenylbutyrate) complex. The NIR CD spectra for the 4f --> 4ftransitions of the 3d-4f (Lambda-Delta)-Cr(ox)Ln complexes 1 and 2 with configurational chirality around the Ln ion with no asymmetric carbon were observed for the first time in CH2Cl2.This observation is supported by the selection rule for the optical activity of the 4f --> 4f transitions. The first solution NIR magnetic circular dichroism (MCD) of the racemic Cr(ox)Yb and Cr(ox)Dy complexes is also reported.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/01/20 alle ore 18:57:52