PMID- 30270965
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220129
IS  - 0378-3812 (Print)
IS  - 0378-3812 (Linking)
VI  - 448
DP  - 2017 Sep 25
TI  - Solvatochromic parameters of deep eutectic solvents formed by ammonium-based 
      salts and carboxylic acids.
PG  - 15-21
LID - 10.1016/j.fluid.2017.04.020 [doi]
AB  - Deep eutectic solvents (DES) have been studied in a wide range of applications, 
      and despite their potential as sustainable solvents, detailed knowledge on their 
      solvatochromic parameters is still lacking. To overcome this problem, in this 
      work, the Kamlet Taft (KT) solvatochromic parameters, namely the hydrogen-bond 
      acidity, hydrogen-bond basicity and dipolarity/polarizability, of a wide range of 
      DES composed of ammonium-based salts as hydrogen bond acceptors (HBAs), and 
      carboxylic acids as hydrogen bond donors (HBDs), were determined aiming at better 
      understanding the influence of the chemical structure of the DES components on 
      their polarity. It is shown that the high acidity of the DES investigated is 
      mainly provided by the organic acid present in the mixture, and that an increase 
      of the alkyl side chain of both the HBA and the HBD species leads to a lower 
      ability of the solvent to donate protons. On the other hand, the ammonium salt 
      plays the major role on the hydrogen-bond basicity of DES. Contrarily to the 
      hydrogen-bond acidity, an increase in the length of the aliphatic moieties of 
      both the carboxylic acid and salt cation results in solvents with higher ability 
      to accept protons. The dipolarity/polarizability of DES is mainly defined by the 
      ionic species present, and tend to decrease with the increase of the aliphatic 
      moiety of the organic acid. In general, DES composed of ammonium-based salts and 
      carboxylic acids present a higher capacity to donate and accept protons when 
      compared to most of the ionic liquids or organic molecular solvents.
FAU - Teles, Ana Rita R
AU  - Teles ARR
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
FAU - Capela, Emanuel V
AU  - Capela EV
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
FAU - Carmo, Rafael S
AU  - Carmo RS
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
FAU - Coutinho, Joao A P
AU  - Coutinho JAP
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
FAU - Silvestre, Armando J D
AU  - Silvestre AJD
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
FAU - Freire, Mara G
AU  - Freire MG
AD  - CICECO - Aveiro Institute of Materials, Department of Chemistry, University of 
      Aveiro, 3810-193 Aveiro, Portugal.
LA  - eng
GR  - 337753/ERC_/European Research Council/International
PT  - Journal Article
DEP - 20170503
PL  - Netherlands
TA  - Fluid Phase Equilib
JT  - Fluid phase equilibria
JID - 101322266
PMC - PMC6161808
MID - EMS79713
OTO - NOTNLM
OT  - Ammonium salts
OT  - Carboxylic acids
OT  - Deep eutectic solvents
OT  - Solvatochromic parameters
EDAT- 2018/10/03 06:00
MHDA- 2018/10/03 06:01
PMCR- 2018/09/28
CRDT- 2018/10/02 06:00
PHST- 2018/10/02 06:00 [entrez]
PHST- 2018/10/03 06:00 [pubmed]
PHST- 2018/10/03 06:01 [medline]
PHST- 2018/09/28 00:00 [pmc-release]
AID - 10.1016/j.fluid.2017.04.020 [doi]
PST - ppublish
SO  - Fluid Phase Equilib. 2017 Sep 25;448:15-21. doi: 10.1016/j.fluid.2017.04.020. 
      Epub 2017 May 3.