Urea vs. carbamate groups: a comparative study in a chiral C2 symmetric organogelator.
The effect of the replacement of molecular moieties (carbamates vs. urea) that drive self-assembly for two organogelators with an identical C(2) symmetric molecular structure is described. The main properties of the gels obtained from the urea-based organogelators are also discussed. The proposed organogelators are chiral molecules and are able to express chirality also at the supramolecular level, thus allowing the employment of electronic circular dichroism to gain insight into the molecular-scale structure of fibrillar aggregates. With the same technique, the behavior of enantiomeric mixtures of the urea-based organogelators was investigated, revealing the occurrence of different self-sorting phenomena at the molecular and supramolecular scale. The urea-based organogelators demonstrated to be more efficient gelators with respect to the carbamate-based analogues, showing a high gel-to-sol transition temperature (up to 66 °C) and a very low minimum gelling concentration (0.85 mg mL(-1)). This study is a starting point for a deeper investigation of structure/property relationships and, taking into account the peculiar behavior detected for the enantiomeric mixtures, also of self-sorting and molecular recognition phenomena.
"Ugo Schiff" Chemistry Department, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy and INSTM Consortium, UdR Firenze, Via G. Giusti 9, 50121, Firenze, Italy.
Luisa
L
Lascialfari
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Moruzzi 13, 56124 Pisa, Italy.
Gennaro
G
Pescitelli
"Ugo Schiff" Chemistry Department, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy and INSTM Consortium, UdR Firenze, Via G. Giusti 9, 50121, Firenze, Italy.
Alberto
A
Brandi
"Ugo Schiff" Chemistry Department, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy and INSTM Consortium, UdR Firenze, Via G. Giusti 9, 50121, Firenze, Italy.
Matteo
M
Mannini
"Ugo Schiff" Chemistry Department, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy and CSGI Consortium, UdR Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
Debora
D
Berti
"Ugo Schiff" Chemistry Department, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy and INSTM Consortium, UdR Firenze, Via G. Giusti 9, 50121, Firenze, Italy.
Stefano
S
Cicchi