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

ABSTRACT: 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.

SUBMITTER: Mannu A

PROVIDER: S-EPMC7180541 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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

Mannu Alberto A Di Pietro Maria Enrica ME Mele Andrea A

Molecules (Basel, Switzerland) 20200325 7

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 confirm ...[more]

PMID: 32218347

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