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Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems

UV–VIS spectroscopy analysis of six mixtures containing choline chloride or triphenylmethylphosphonium bromide as the hydrogen bond acceptor (HBA) and different hydrogen bond donors (HBDs, nickel sulphate, imidazole, d-glucose, ethylene glycol, and glycerol) allowed to determine the indirect and dir...

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Autores principales: Mannu, Alberto, Di Pietro, Maria Enrica, Mele, Andrea
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7180541/
https://www.ncbi.nlm.nih.gov/pubmed/32218347
http://dx.doi.org/10.3390/molecules25071495
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author Mannu, Alberto
Di Pietro, Maria Enrica
Mele, Andrea
author_facet Mannu, Alberto
Di Pietro, Maria Enrica
Mele, Andrea
author_sort Mannu, Alberto
collection PubMed
description UV–VIS spectroscopy analysis of six mixtures containing choline chloride or triphenylmethylphosphonium bromide as the hydrogen bond acceptor (HBA) and different hydrogen bond donors (HBDs, nickel sulphate, imidazole, d-glucose, ethylene glycol, and glycerol) allowed to determine the indirect and direct band-gap energies through the Tauc plot method. Band-gap energies were compared to those relative to known choline chloride-containing deep band-gap systems. The measurements reported here confirmed the tendency of alcohols or Lewis acids to increment band-gap energy when employed as HBDs. Indirect band-gap energy of 3.74 eV was obtained in the case of the triphenylmethylphosphonium bromide/ethylene glycol system, which represents the smallest transition energy ever reported to date for such kind of systems.
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spelling pubmed-71805412020-05-01 Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems Mannu, Alberto Di Pietro, Maria Enrica Mele, Andrea Molecules Article UV–VIS spectroscopy analysis of six mixtures containing choline chloride or triphenylmethylphosphonium bromide as the hydrogen bond acceptor (HBA) and different hydrogen bond donors (HBDs, nickel sulphate, imidazole, d-glucose, ethylene glycol, and glycerol) allowed to determine the indirect and direct band-gap energies through the Tauc plot method. Band-gap energies were compared to those relative to known choline chloride-containing deep band-gap systems. The measurements reported here confirmed the tendency of alcohols or Lewis acids to increment band-gap energy when employed as HBDs. Indirect band-gap energy of 3.74 eV was obtained in the case of the triphenylmethylphosphonium bromide/ethylene glycol system, which represents the smallest transition energy ever reported to date for such kind of systems. MDPI 2020-03-25 /pmc/articles/PMC7180541/ /pubmed/32218347 http://dx.doi.org/10.3390/molecules25071495 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mannu, Alberto
Di Pietro, Maria Enrica
Mele, Andrea
Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_full Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_fullStr Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_full_unstemmed Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_short Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_sort band-gap energies of choline chloride and triphenylmethylphosphoniumbromide-based systems
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7180541/
https://www.ncbi.nlm.nih.gov/pubmed/32218347
http://dx.doi.org/10.3390/molecules25071495
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