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Titolo:
Copper complexes with bibracchial lariat ethers: from mono- to binuclear structures
Autore:
Rodriguez-Infante, C; Esteban, D; Avecilla, F; de Blas, A; Rodriguez-Blas, T; Mahia, J; Macedo, AL; Geraldes, CFGC;
Indirizzi:
Univ Coruna, Fac Ciencias, Dept Quim Fundamental, A Coruna 15071, Spain Univ Coruna A Coruna Spain 15071 Quim Fundamental, A Coruna 15071, Spain Univ Coruna, Serv Xerais Apoio Invest, Dept Quim Fundamental, La Coruna 15071, Spain Univ Coruna La Coruna Spain 15071 im Fundamental, La Coruna 15071, Spain Univ Nova Lisboa, Fac Ciencias & Tecnol, CQFB, Dept Quim, P-2825114 Caparica, Portugal Univ Nova Lisboa Caparica Portugal P-2825114 -2825114 Caparica, Portugal Univ Coimbra, Fac Ciencias & Tecnol, Dept Bioquim, P-3049 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3049 t Bioquim, P-3049 Coimbra, Portugal Univ Coimbra, Ctr Neurociencias, P-3049 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3049 ociencias, P-3049 Coimbra, Portugal
Titolo Testata:
INORGANICA CHIMICA ACTA
fascicolo: 1-2, volume: 317, anno: 2001,
pagine: 190 - 198
SICI:
0020-1693(20010528)317:1-2<190:CCWBLE>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC EXCHANGE INTERACTIONS; NICKEL(II);
Keywords:
copper(II) complexes; macrocycle; lariat ether; crystal structures; EPR spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: de Blas, A Univ Coruna, Fac Ciencias, Dept Quim Fundamental, Campus Zapateira S-N, A Coruna 15071, Spain Univ Coruna Campus Zapateira S-N A Coruna Spain 15071 1, Spain
Citazione:
C. Rodriguez-Infante et al., "Copper complexes with bibracchial lariat ethers: from mono- to binuclear structures", INORG CHIM, 317(1-2), 2001, pp. 190-198

Abstract

Copper(II) complexes with a series of bibracchial lariat ethers are described. Independently of the nature of the counterion present (nitrate or perchlorate), the lariat ether N,N'-bis(2-aminobenzyl)-1,10-diaza-15-crown-5 (L-1) always forms mononuclear complexes, whereas the lariat ethers N,N'-bis(2-aminobenzyl)-4, 13-diaza-18-crown-6 (L-2) and N,N'-bis(2-salicylaldiminobenzyl)4,13-diaza-18-crown-6 (L-3) only give binuclear compounds. The X-ray crystal structure of [CuL1](ClO4)(2) shows a seven-coordinated copper (II) ion in a distorted (axially compressed) pentagonal-bipyramidal geometry. The X-ray crystal structure of [Cu-2(L-3-2H)](ClO4)(2) confirms the binuclearnature of the compound with both metal ions having identical coordination environments and each one placed out of the crown hole but efficiently encapsulated by the corresponding pendant arm; each copper(II) ion is five-coordinated with an intermediate geometry between trigonal-bipyramidal and square-pyramidal (tau = 0.40). The EPR spectra in frozen solution samples are in accordance with a stable coordinate pattern for the metal centre of ligand L-1, yielding a rhombic distorted complex with axial compression in solution, in agreement with the X-ray crystal structure of [CuL1](ClO4)(2). For the binuclear complexes of L-2 and L-3, the Cu(II) centres in solution can be distorted from their tetragonally elongated structures via interaction with ethanol and/or the nitrate counterion, leading to more than one species. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:28:37