By Xiaogong Wang
This e-book explores practical polymers containing fragrant azo chromophores in side-chain, main-chain and different elements in their constructions, referred to as azo polymers and which percentage universal photoresponsive houses. It makes a speciality of the molecular structure of azo polymers, the substitute tools and their most vital capabilities, comparable to photoinduced birefringence and dichroism, surface-relief-grating (SRG) formation, and light-driven deformation of liquid crystal elastomers. It combines a common survey of the topic and in-depth discussions of every subject, together with a variety of illustrations, figures, and pictures. delivering a stability among an creation to the center strategies and a image of scorching and rising issues, it truly is of curiosity to graduate scholars and researchers operating during this and similar fields.
Xiaogong Wang is a Professor on the division of Chemical Engineering, Tsinghua college, China.
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Extra resources for Azo Polymers: Synthesis, Functions and Applications
The density functional theory (DFT) in the local-density approximation (LDA) calculation also shows that the potential energy in the vicinity of the minima is weakly dependent on the dihedral angles . Most of above calculations correspond to the case of azobenzene in vacuum. Briquet et al. considered the role of solvent in MP2 and DFT calculations; it also showed that in solutions, energy difference between the planar and twisted t-AB is negligible . As cis-azobenzene (c-AB) has higher energy than t-AB, it is much more difficult to obtain a pure sample for the analysis.
The ab initio calculations have been widely used to explore the photoisomerization mechanism of azobenzene and its derivatives. In a pioneering study, the photoisomerization of azobenzene under n ! π* and π ! π* excitation was investigated by ab initio calculation . Some most important nuclear geometries were obtained by optimizing with the complete active space self-consistent field (CASSCF). 4 Photoisomerization Mechanism of Azobenzene 37 for n ! π* excitation, while rotation occurs after π !
In a pioneering study, the photoisomerization of azobenzene under n ! π* and π ! π* excitation was investigated by ab initio calculation . Some most important nuclear geometries were obtained by optimizing with the complete active space self-consistent field (CASSCF). 4 Photoisomerization Mechanism of Azobenzene 37 for n ! π* excitation, while rotation occurs after π ! π* excitation. This result obtained from the theoretical investigation is consistent with the dual-pathway mechanism [29, 30], which was generally accepted at that time.