Photoswitching units

In an interesting application of this result, a photoswitchable unit has been incorporated by covalent linkage into a protein molecule (92JA3150). This has resulted in the ability to photoregulate the binding properties of the protein by effecting minor perturbations in its conformations. 

Diarylethene as a Photoswitching Unit of Intramolecular Magnetic Interaction... 

Attempts to photoswitch the intramolecular magnetic interaction based on photo-chromism of diarylethenes have been overviewed. The switching between the disjoint and non-disjoint structures caused a change in the interaction between the separated spins. Photochromic diarylethene is one of the most favorable photoswitching units for magnetic interactions. This system has the possibility to be applied to the molecular-scale information processing system [73-77]. 

However, the ring-opening quantum yields decreased dramatically with the increasing number of the thiophene rings. It is therefore not well suited for use as a photoswitch unit in molecular wire systems. 

The majority of the systems outlined in this monograph contain the azobenzene moiety as the photoswitchable unit. Therefore, the first chapter of this monograph deals with the properties of this simple molecule and its simple derivatives. Applications for various purposes are covered in some of the following chapters. 

Miklailov et have employed TDDFT to design two-photon operated molecular switches built from the diarylethene photoswitching unit and a two-photon absorbing pendant substituent. Both the one- and two-pho-ton absorption spectra were simulated and analyzed in order to understand... 

Matsuda K, Me M (2004) Diarylethene as a photoswitching unit. J Photochem Photobiol C... 

Currently, dendrimer research is developing swiftly in the direction of highly functional materials. Also in the field of photoactive dendrimers the complexity of the systems has increased enormously. The investigation of dendritic structures functionalized with luminescent groups [14], photoswitchable units [15], energy and/or electron donor-acceptor components and the implementation of such functionalized dendrimers in devices [16], provide insight in the fundamental processes occurring in such complex systems and in their fumre applications. 

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