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Titre du document / Document title

Crystal Structure of a Schiff Base, 2-Hydroxynaphthylidene-(8-aminoquinoline) -In Search of Two Tautomeric Forms

Auteur(s) / Author(s)

LIPKOWSKI J. ; FITA P. ; GRABOWSKA A. ;

Résumé / Abstract

Crystal structure of a Schiffbase, 2-hydroxynaphthylidene-(8-aminoquinoline) (HNAQ) has been determined at 4 different temperatures in the range of 100-400 K. While spectral studies would indicate the coexistence of two different tautomeric forms in thermal equilibrium, no statistically significant structural effects have been observed as the presumed evidence for the presence of the enol form in the solid. HNAQ crystallizes in the monoclinic space group Pc with unit cell parameters a= 10.3400(7) Å, b = 5.8870(19) Å, c= 14.2960(21) Å, β= 125.844(10)°, V= 705.41(27) Å3 and Z= 2 (at 100 K). Crystallographic data for HNAQ have been compared to previously known structures of its metalo-organic complexes. This showed only minor changes due to complexation. In all the cases the molecules in the crystal are almost planar and the presence of the metal atom affects only the bonds in the chelate ring.

Revue / Journal Title

Polish journal of chemistry    ISSN  0137-5083 

Source / Source

2008, vol. 82, no10, pp. 2009-2016 [8 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Polish Chemical Society, Warsaw, POLOGNE  (1978) (Revue)

Mots-clés d'auteur / Author Keywords

Schiffbase

;

tautomerism

;

proton transfer

;

Localisation / Location

INIST-CNRS, Cote INIST : 4711, 35400018570474.0130

Nº notice refdoc (ud4) : 20756531



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