In this work, the aggregation behaviour of a chiral perylene derivative, that is, N,N0-bis-(R)-(10-phenyl- ethyl)-perylene-3,4,9,10-tetracarboxyldiimide (R-Pery), was studied by means of 1H NMR (including DOSY techniques), circular dichroism, UV–Vis and fluorescence spectroscopies in various conditions. The acquired data demonstrate that R-Pery tends to aggregate in pure solvents at high concentrations (>105 M in DMSO and >103 M in CHCl3), whereas aggregation occurred at lower concentrations by add- ing a poor solvent, such as water (to DMSO) or CH3CN (to chloroform). Interesting results were obtained studying the optical behaviour of R-Pery when dispersed into a linear low-density polyethylene matrix (LLDPE). In particular, the aggregation extent of R-Pery into LLDPE was investigated by means of UV– Vis, fluorescence and CD spectroscopies as a function of dye concentration as well as thermal stimuli. The optical responsiveness of R-Pery (both in absorption and in emission) versus moderate temperature changes (i.e., for T > 35 °C) suggests applications of polymer dispersions as smart and reversible indicators to thermal solicitations.

Association phenomena of a chiral perylene derivative in solution and in poly(ethylene) dispersion

PUCCI, ANDREA;UCCELLO BARRETTA, GLORIA;PESCITELLI, GENNARO;DI BARI, LORENZO;RUGGERI, GIACOMO
2010

Abstract

In this work, the aggregation behaviour of a chiral perylene derivative, that is, N,N0-bis-(R)-(10-phenyl- ethyl)-perylene-3,4,9,10-tetracarboxyldiimide (R-Pery), was studied by means of 1H NMR (including DOSY techniques), circular dichroism, UV–Vis and fluorescence spectroscopies in various conditions. The acquired data demonstrate that R-Pery tends to aggregate in pure solvents at high concentrations (>105 M in DMSO and >103 M in CHCl3), whereas aggregation occurred at lower concentrations by add- ing a poor solvent, such as water (to DMSO) or CH3CN (to chloroform). Interesting results were obtained studying the optical behaviour of R-Pery when dispersed into a linear low-density polyethylene matrix (LLDPE). In particular, the aggregation extent of R-Pery into LLDPE was investigated by means of UV– Vis, fluorescence and CD spectroscopies as a function of dye concentration as well as thermal stimuli. The optical responsiveness of R-Pery (both in absorption and in emission) versus moderate temperature changes (i.e., for T > 35 °C) suggests applications of polymer dispersions as smart and reversible indicators to thermal solicitations.
Pucci, Andrea; Donati, F.; Nazzi, S.; UCCELLO BARRETTA, Gloria; Pescitelli, Gennaro; DI BARI, Lorenzo; Ruggeri, Giacomo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/194393
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