Issue 12, 2003
From the journal:

New Journal of Chemistry

Conformational rearrangement of 2,6-bis(1-salicyloylhydrazonoethyl)pyridine (H4daps) on complexation. Synthesis and X-ray characterisation of H4daps and its copper helicate complex [Cu(H2daps)(H2O)]2·2CH3CN

Manuel R. Bermejo,*a   Rosa Pedrido,a   Ana M. González-Noya,a   María J. Romero,a   Miguel Vázquezb  and  Lorenzo Soracec  

* Corresponding authors

a Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
E-mail: qimb45@usc.es

b Laboratorio di Chimica Supramolecolare, Dipartimento di Chimica Generale, Università di Pavia, Pavia, Italy
E-mail: miguel.vazquez@unipv.it

c Laboratorio di Magnetismo Molecolare, Dipartimento di Chimica, Università di Firenze, Sesto Fiorentino (Fi), Italy
E-mail: lorenzo.sorace@unifi.it

Abstract

The copper complex of 2,6-bis(1-salicyloylhydrazonoethyl)pyridine, H4daps, has been prepared by an electrochemical procedure and characterised by elemental analysis, IR, FAB mass spectroscopy, ΛM, magnetic susceptibility measurements and EPR studies. The molecular structures of the ligand H4daps (1) and its copper complex [Cu(H2daps)(H2O)]2·2CH3CN (3) have been determined by X-ray diffraction studies. The ligand shows in the solid state a syn-open conformation that allows it to act as a binucleating ligand, after a conformational change, as is shown by the study of the copper dihelicate 3. This compound contains the dianionic ligand [H2daps]2− in an anti-open conformation. The comparative study of this complex, with others previously reported, allows us to confirm that the conformational rearrangement undergone by H4daps upon complexation depends strongly on the metal nature and its stereochemical preferences.

Graphical abstract: Conformational rearrangement of 2,6-bis(1-salicyloylhydrazonoethyl)pyridine (H4daps) on complexation. Synthesis and X-ray characterisation of H4daps and its copper helicate complex [Cu(H2daps)(H2O)]2·2CH3CN

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Article information

DOI
https://doi.org/10.1039/B305354G
Article type
Paper
Submitted
12 May 2003
Accepted
19 Aug 2003
First published
25 Sep 2003

New J. Chem., 2003,27, 1753-1759

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Conformational rearrangement of 2,6-bis(1-salicyloylhydrazonoethyl)pyridine (H4daps) on complexation. Synthesis and X-ray characterisation of H4daps and its copper helicate complex [Cu(H2daps)(H2O)]2·2CH3CN

M. R. Bermejo, R. Pedrido, A. M. González-Noya, M. J. Romero, M. Vázquez and L. Sorace, New J. Chem., 2003, 27, 1753 DOI: 10.1039/B305354G

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