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Titolo:
Syntheses, crystal structures and magnetic properties of polynuclear 1,4,5,8,9,12-hexaazatriphenylene (hat)-bridged copper(II) complexes
Autore:
Grove, H; Sletten, J; Julve, M; Lloret, F;
Indirizzi:
Univ Bergen, Dept Chem, N-5007 Bergen, Norway Univ Bergen Bergen Norway N-5007 ergen, Dept Chem, N-5007 Bergen, Norway Univ Valencia, Fac Chem, Dept Inorgan Chem, Burjassot 46100, Spain Univ Valencia Burjassot Spain 46100 Inorgan Chem, Burjassot 46100, Spain
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 7, , anno: 2001,
pagine: 1029 - 1034
SICI:
1472-7773(2001):7<1029:SCSAMP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRIDGING LIGAND; RUTHENIUM(II) COMPLEXES; PI-COMPLEXATION; SOLID-STATE; DNA; MULTICOMPONENT; 1,4,5,8-TETRAAZAPHENANTHRENE; BINDING; ACID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Sletten, J Univ Bergen, Dept Chem, Allegt 41, N-5007 Bergen, Norway Univ Bergen Allegt 41 Bergen Norway N-5007 5007 Bergen, Norway
Citazione:
H. Grove et al., "Syntheses, crystal structures and magnetic properties of polynuclear 1,4,5,8,9,12-hexaazatriphenylene (hat)-bridged copper(II) complexes", J CHEM S DA, (7), 2001, pp. 1029-1034

Abstract

Three polynuclear compounds containing copper(II) and 1,4,5,8,9,12-hexaazatriphenylene (hat) as the basic building blocks have been prepared, [Cu-4(hat)(2)Cl-8](n). 6nH(2)O 1, [Cu(hat)(H2O)(2)](n)[NO3](2n) 2, and [Cu-2(hat)(H2O)(6)](n)[SO4](2n). 2nH(2)O 3, their crystal structures determined and variable-temperature magnetic susceptibility data measured. The basic building block in 1 is the dinuclear [Cu-2(hat)Cl-4] entity, two such units being connected to tetranuclear units through relatively strong axial Cu-Cl bonds(out-of-plane di-mu -chloro bridges). Weaker axial Cu . . . Cl interactions link the units into a sheet structure. In 2 and 3 hat-bridged copper(II) chains extending along glide planes are present. hat serves as a bis-bidentate ligand in 2 and as a ter-bidentate ligand in 3; in the latter compound one of the copper atoms coordinated to hat does not participate in chain formation. The copper coordination geometries observed in these compounds aresquare pyramidal and elongated octahedral. hat coordinates either in only equatorial positions to copper (1), or alternates with one chelate in two equatorial positions and another in one equatorial and one axial position (2and 3). The copper . . . copper distance across the hat bridge in 1 is 6.857(1) Angstrom and 3.517(1), 3.600(1) and 3.651(1) Angstrom across the three different di-mu -chloro bridges. In 2 the intrachain Cu . . . Cu distanceis 6.797(1) Angstrom. Three different Cu . . . Cu distances across the hatbridge are found in 3, one of 6.789(1) Angstrom involving two equatorial Cu-N bonds across a pyrazine ring, and two of 7.117(1) and 7.186(1) Angstrominvolving one equatorial and one axial Cu-N bond to a pyrazine. Variable-temperature susceptibility measurements on 1-3 reveal the occurrence of weakintramolecular antiferromagnetic interactions between copper(II) ions through bridging hat, the J values being -2.5 (1), -2.1 (2) and -2.4 cm(-1) (3). In 1 the interaction across the di-mu -chloro bridge within the tetranuclear entity (J') is found to be weak and ferromagnetic in character (ca. +0.7 cm(-1)).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:29:55