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Photo-and Thermal Isomerization of Azobenzenes Incorporated in Macrocyclic Coordination Compounds (pp. 81-116) $100.00
Authors:  (Masaki Yamamura, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan)
Abstract:
Azobenzene, which is one of the most utilized photo-switchable
molecular units, has been fascinating because photoisomerization of
azobenzene accompanies the switch of a variety of unique properties in
polymers, liquid crystals, metal materials, proteins, and molecular
machines. When azobenzene is irradiated, an isomerization between the
trans- and cis-azobenzenes takes place. The trans/cis isomerization leads
to a large geometrical change. Incorporation of azobenzene into
macrocyclic scaffolds can lead to significant change in the spectral
property and isomerization process of azobenzene because a restrained
macrocyclic structure affects the geometrical change caused by
isomerization. For example, the cis-azobenzene, which is usually
thermally unstable and undergoes thermal cis-to-trans isomerization, is
stabilized more than the trans-azobenzene when it is incorporated into a
highly restrained macrocycle. A variety of azobenzenes incorporated in
macrocyclic structures, which are composed of covalent bonds, have been
extensively studied. On the other hand, azobenzene-incorporated
macrocycles via coordination bonding are not sufficiently investigated.
Noncovalent coordination bonding can drive self-assemble processes that
are crucial methods for the facile construction large supramolecular
assemblies, macrocycles, cage, or other complicated structures.
In this chapter, I focus on the synthesis, photo- and thermal
isomerizations of azobenzenes incorporated in macrocyclic coordination
compounds. I discuss the effect of macrocyclic structures on the
isomerization of azobenzenes. 


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Photo-and Thermal Isomerization of Azobenzenes Incorporated in Macrocyclic Coordination Compounds (pp. 81-116)