Abstract
A new series of push–pull azo-dyes containing tricyanodiphenyl electron-withdrowing block, namely (4-N,N-dialkylaminophenyl)azobiphenyl-2,3’,4’-tricarbonitriles, was proposed and synthesized. The azo-dyes possess high temperature stability and are prone to form polymorph modifications. DSC measurements indicated solid-phase transitions of these polymorphs. X-ray diffraction (XRD) analysis revealed that in all solved structures, there is a network of short intermolecular contacts between HArom atoms and N atoms of cyano groups. The supramolecular structure of these contacts depends on the alkyl chain length in the aniline moiety, and changes after temperature induced phase transitions.
Original language | English |
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Pages (from-to) | 88-98 |
Number of pages | 11 |
Journal | Thermochimica Acta |
Volume | 669 |
DOIs | |
Publication status | Published - 10 Nov 2018 |
Keywords
- Azo dye
- Polymorphism
- Solid phase polymorphic modifications
- X-ray and DSC measurements
- AZOBENZENE DERIVATIVES
- DYES
- NONLINEAR-OPTICAL PROPERTIES
- AZO
- CHROMOPHORES
- COMPLEXES