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

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 indire...

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Bibliographic Details
Main Authors: Alberto Mannu, Maria Enrica Di Pietro, Andrea Mele
Format: Article
Language:English
Published: MDPI AG 2020-03-01
Series:Molecules
Subjects:
deep eutectic solvents
deep band-gap systems
uv–vis
tauc plot
molten systems.
Online Access:https://www.mdpi.com/1420-3049/25/7/1495
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spelling doaj-260c97fd06e243e9a7ab4b28c2855ee82020-11-25T02:10:02ZengMDPI AGMolecules1420-30492020-03-01257149510.3390/molecules25071495molecules25071495Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based SystemsAlberto Mannu0Maria Enrica Di Pietro1Andrea Mele2Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, ItalyDepartment of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, ItalyDepartment of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, ItalyUV−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.https://www.mdpi.com/1420-3049/25/7/1495deep eutectic solventsdeep band-gap systemsuv–vistauc plotmolten systems.
collection DOAJ
language English
format Article
sources DOAJ
author Alberto Mannu
Maria Enrica Di Pietro
Andrea Mele
spellingShingle Alberto Mannu
Maria Enrica Di Pietro
Andrea Mele
Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
Molecules
deep eutectic solvents
deep band-gap systems
uv–vis
tauc plot
molten systems.
author_facet Alberto Mannu
Maria Enrica Di Pietro
Andrea Mele
author_sort Alberto Mannu
title Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems
title_short 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_sort band-gap energies of choline chloride and triphenylmethylphosphoniumbromide-based systems
publisher MDPI AG
series Molecules
issn 1420-3049
publishDate 2020-03-01
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.
topic deep eutectic solvents
deep band-gap systems
uv–vis
tauc plot
molten systems.
url https://www.mdpi.com/1420-3049/25/7/1495
work_keys_str_mv AT albertomannu bandgapenergiesofcholinechlorideandtriphenylmethylphosphoniumbromidebasedsystems
AT mariaenricadipietro bandgapenergiesofcholinechlorideandtriphenylmethylphosphoniumbromidebasedsystems
AT andreamele bandgapenergiesofcholinechlorideandtriphenylmethylphosphoniumbromidebasedsystems
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