Extended conjugation in di- and tri-arylmethane dyes. Part 4. Steric and electronic effects in analogues of Malachite Green containing a 2H-1-benzopyran unit

Stephen E. Clayton; Stéphane G. R. Guinot; John D. Hepworth; Mark Wainwright

doi:10.1039/A908044I

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Extended conjugation in di- and tri-arylmethane dyes. Part 4.¹ Steric and electronic effects in analogues of Malachite Green containing a 2H-1-benzopyran unit

Stephen E. Clayton,^a Stéphane G. R. Guinot,^a John D. Hepworth*^b and Mark Wainwright^a

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* Corresponding authors

^a Department of Chemistry, University of Central Lancashire, Preston, UK

^b Department of Chemistry, University of Hull, Hull, UK

Abstract

Triarylmethane dyes containing a 2,2-dimethyl-2H-1-benzopyran unit have been synthesised. The visible spectral parameters of these novel dyes are akin to those of the 1- and 2-naphthyl analogues of Malachite Green with the effects of a methoxy group superimposed to represent the influence of the oxygen heteroatom. Steric constraints are accommodated by an increased departure from molecular coplanarity along the y-axis.

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Article information

DOI: https://doi.org/10.1039/A908044I
Article type: Paper
Submitted: 06 Oct 1999
Accepted: 23 Nov 1999
First published: 14 Jan 2000

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J. Chem. Soc., Perkin Trans. 2, 2000, 263-269

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