Comparative study of the self-assembly behaviour of 3-chloro-4-hydroxy-phenylazo dyes.
Soft Matter
; 19(24): 4579-4587, 2023 Jun 21.
Article
em En
| MEDLINE
| ID: mdl-37310076
ABSTRACT
The complexity of intermolecular interactions and the difficulty to predict assembly behaviour solely based on chemical constitution was demonstrated by studying the self-assembly of three one-fold negatively charged 3-chloro-4-hydroxy-phenylazo dyes (Yellow, Blue and Red). Dye self-assembly was investigated using UV/vis- and NMR-spectroscopy, light- and small-angle neutron scattering. Significant differences between the three dyes were observed. While Yellow does not self-assemble, Red assembles into higher-order aggregates and Blue forms well-defined H-aggregate dimers with a dimerization constant of KD = (728 ± 8) L mol-1. Differences between dyes were suggested to emerge from variations in the propensity to form π-π-interactions due to electrostatic repulsion, sterical constraints and hydrogen-bonding interactions.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Soft Matter
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
França