http://www.cnr.it/ontology/cnr/individuo/prodotto/ID194865

Copper(II) compounds with NNO tridentate Schiff base ligands: Effect of subtle variations in ligands on complex formation, structures and magnetic propertie (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Copper(II) compounds with NNO tridentate Schiff base ligands: Effect of subtle variations in ligands on complex formation, structures and magnetic propertie (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.ica.2012.02.030 (literal)

Alternative label

Luca Rigamonti, Alessandra Forni, Roberta Pievo, Jan Reedijk, Alessandro Pasini (2012)
Copper(II) compounds with NNO tridentate Schiff base ligands: Effect of subtle variations in ligands on complex formation, structures and magnetic propertie
in Inorganica Chimica Acta (Testo stamp.); Elsevier BV, Amsterdam (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Luca Rigamonti, Alessandra Forni, Roberta Pievo, Jan Reedijk, Alessandro Pasini (literal)

Pagina inizio

373 (literal)

Pagina fine

382 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/inorganica-chimica-acta/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

387 (literal)

Rivista

Inorganica Chimica Acta (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

10 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Università degli Studi di Milano, Dipartimento di Chimica Inorganica, Metallorganica e Analitica 'Lamberto Malatesta', via Venezian 21, 20133 Milano, Italy Università degli Studi di Firenze, Dipartimento di Chimica 'Ugo Schiff', via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy CNR-ISTM, via Golgi 19, 20133 Milano, Italy Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia (literal)

Titolo

Copper(II) compounds with NNO tridentate Schiff base ligands: Effect of subtle variations in ligands on complex formation, structures and magnetic propertie (literal)

Abstract

The formation and the magnetic properties of the copper(II) compounds [Cu(L1)(py)](ClO4) (1a) and [Cu(L2)(py)](ClO4) (2a), bearing the NNO tridentate Schiff base ligand L1- = (E)-2-((3-aminoethylimino) methyl)phenolate or L2- = (E)-2-((3-aminopropylimino)methyl)phenolate (obtained by monocondensation of salicylaldehyde, salH, and ethylenediamine, en, or 1,3-propylenediamine, tn, respectively) and pyridine (py) are presented. These complexes are converted into new mono-, di- and trinuclear derivatives, whose nature depends on the length of the diamine used and hence on the size of the corresponding metallacycle. Pyridine can be substituted by a molecule of N,N-dimethylformamide (DMF) in compound 2a, leading to the mononuclear [Cu(L2)(dmf)](ClO4) (2b), while 1a undergoes only decomposition under similar conditions. Pyrazine does not act as bridging ligand between two copper centres by substitution of py, but its reaction with 2a yields either the dinuclear compound [Cu2(L2)2(ClO4)2] (2c), with exclusion of pyridine, or the trinuclear [Cu3(L2)3(l3-OH)](ClO4)2 (2d), where pyrazine acts as base generating OH-, and it does not appear in the product. Reaction of 1a with pyrazine yields only the trinuclear [Cu3(L1)3(l3-OH)](ClO4)2 (1d). Also with 2,20-bipyridine (2,20-bpy) dinuclear complexes are not formed, but bpy acts as bidentate ligand to copper yielding the pentacoordinated mononuclear compounds [Cu(L1)(2,20-bpy)](ClO4) (1e) and [Cu(L2)(2,20-bpy)](ClO4) (2e). The crystal structures of compounds 2b, 2c and 1e have been solved and are reported. The magnetic susceptibilities vM(T) of 1a and 2a have been studied, showing the absence of any measurable Cu-Cu interaction for 1a (en, five-membered ring), while a weak but interesting intermolecular Cu-Cu ferromagnetic coupling (J = +0.96(3) cm-1) through the short dimeric Cu...O contacts is detected for 2a (tn, six-membered ring). The X-band EPR spectrum of 2a in a frozen methanol solution at 70 K shows the hyperfine coupling of mononuclear copper with the three coordinated 14N atoms, yielding seven narrow lines. (literal)

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