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Titolo:
A Schiff-base bibracchial lariat ether selective receptor for lanthanide(III) ions
Autore:
Platas, C; Avecilla, F; de Blas, A; Rodriguez-Blas, T; Bastida, RN; Macias, A; Rodriguez, A; Adams, H;
Indirizzi:
Univ Coruna, Fac Ciencias, Dept Quim Fundamental, Coruna 15071A, Spain Univ Coruna Coruna Spain 15071A t Quim Fundamental, Coruna 15071A, Spain Univ Santiago de Compostela, Fac Quim, Dept Quim Inorgan, Santiago De Compostela 15706, Spain Univ Santiago de Compostela Santiago De Compostela Spain 15706 06, Spain Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S3 7HF S Yorkshire, England
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 11, , anno: 2001,
pagine: 1699 - 1705
SICI:
1472-7773(2001):11<1699:ASBLES>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACROCYCLE COMPLEXATION CHEMISTRY; ALKANOIC ACID COMPLEXES; ALKALI-METAL CATIONS; X-RAY STRUCTURE; MOLECULAR-STRUCTURE; CROWN-ETHER; DISSOCIATION KINETICS; 1,7-DIAZA-4,10,13-TRIOXACYCLOPENTADECANE-N,N'-DIACETIC ACID; CRYSTAL-STRUCTURES; SOLID-STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: de Blas, A Univ Coruna, Fac Ciencias, Dept Quim Fundamental, Campus A Zapateira S-N, Coruna 15071A, Spain Univ Coruna Campus A Zapateira S-N Coruna Spain 15071A , Spain
Citazione:
C. Platas et al., "A Schiff-base bibracchial lariat ether selective receptor for lanthanide(III) ions", J CHEM S DA, (11), 2001, pp. 1699-1705

Abstract

The bibracchial lariat ether N,N'-bis(2-salicylaldiminobenzyl)-4,13-diaza-18-crown-6 (L), in its di-deprotonated form, behaves as a selective receptor for lanthanide(III) ions . It only forms stable complexes with the three lightest members of the lanthanide series, lanthanum(III), cerium(III) and praseodymium(III). The X-ray crystal structures of these three complexes show the metal ion ten-coordinated and deeply buried in the cavity of the dianionic receptor. In all three structures the lariat ether presents a syn arrangement. However, the different size of the encapsulated metal ion modifies the conformation of the receptor, particularly in the fold of the crown,resulting in a very different coordination polyhedron for La(III) (distorted tetracapped trigonal prism) with respect to that of Ce(III) and Pr(III) (bicapped square antiprism). Spectrophotometric titration of the dianionic lariat ether with anhydrous La(ClO4)(3) in acetonitrile allowed us to calculate log K[La(L - 2H)] = 4.65(4).

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Documento generato il 28/03/20 alle ore 10:49:15