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Extra resources for A textbook of inorganic chemistry vol.XI part II Organometalic compounds. Derivatives of Arsenic
The latter acts as an impurity to destroy the mesophase because of the drastic alteration in the molecular structure. 100 Fulgimides bound covalently to the side chains of nematic liquidcrystalline polymers also showed normal photochromism. There have been many papers concerning liquid-crystalline polymers having azobenzenes in their side chains (Figure 14) because of the mesogenic nature of the azo chromophore. 103 The photochromic behavior 32 Chapter 1 Photochromic Polymers 33 of azo chromophores in the side chains of polymers has been investigated using Langmuir–Blodgett (LB) films.
47 A polycationic polymer (17) having the tetrakis [3,5-bis(trifluoromethyl)phenyl]borate anion (TFPB–) as counterion displayed broad absorption bands due to an ion-pair charge-transfer complex between the bipyridinum moiety and the anion. Photoirradiation in vacuo with light exciting the charge-transfer band (>365 nm) resulted in the formation of colored species ascribable to cation radicals with blue coloration. A schematic representation of photoinduced electron-transfer processes is presented in Figure 7.
This is especially true for biological applications. Photochromic molecules have been used to develop photoresponsive systems suitable for mimicking and controlling biological processes. In this chapter, spiropyran derivatives are chosen to illustrate the photocontrol of enzyme activity. In another type of system, spiropyran compounds possessing molecular recognition sites such as crown ethers were prepared as alkali-(alkaline-earth) metal ion receptors and shown to have their binding affinities controlled by irradiation.
A textbook of inorganic chemistry vol.XI part II Organometalic compounds. Derivatives of Arsenic