Properties of azo dyes derived from 2-(N-substituted alkyl-N-arylamino)ethyltrimethyi-ammonium Salts

Penchev, A.; Gadjev, Nikolai; Simov, D.; Hadjieva, Boriana; Balabanova, N.

doi:10.1016/0143-7208(92)87016-t

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Uv-visible Characterization1

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2005

2021

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Cited by 2 publications

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“…4 illustrates the behavior of sample B-E when exposed to HCl gas. Red-shift and narrowing of the p-p* band are due to the protonation of the azo group [36][37][38][39]. The band becomes also structured, probably because of a modification in the structure of vibrational sub-bands [38].…”

Section: Uv-visible Characterizationmentioning

confidence: 99%

One-pot synthesis and characterization of HMS silica carrying Disperse-Red-1 (DR1) covalently bonded to the inner surface

Onida

Borello

Fiorilli

et al. 2005

Comptes Rendus. Chimie

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Through a one-step procedure, covalent bonding of Disperse-Red-1 (DR1) dye to the internal surface of HMS silica has been achieved, leading to anchored molecules freely accessible to gases. Template removal by different solvents yields surface with different polarities, which affect the optical properties of DR1. This effect is dramatic when extraction is carried out in refluxing ethanol, because ethoxylation of the silica surface occurs. To cite this article: B.

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