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trans – cis Photoisomerization of Azobenzene‐Conjugated Dithiolato‐Bipyridine Platinum(II) Complexes: Extension of Photoresponse to Longer Wavelengths and Photocontrollable Tristability by Ryota Sakamoto; Shoko Kume; Manabu Sugimoto; Hiroshi Nishihara is a Chemistry article available to read on EtoBox.

What is trans – cis Photoisomerization of Azobenzene‐Conjugated Dithiolato‐Bipyridine Platinum(II) Complexes: Extension of Photoresponse to Longer Wavelengths and Photocontrollable Tristability about?

## Abstract Azobenzene derivatives modified with dithiolato‐bipyridine platinum(II) complexes were synthesized, revealing their highly extended photoresponses to the long wavelength region as well as unique photocontrollable tristability. The absorptions of __trans__‐**1** and __trans__‐**2** with one azobenzene group on the dithiolene and bipyridine ligands, respectively, cover the range from 300 to 700 nm. These absorptions are ascribed, by means of time‐dependent (TD)DFT calculations, to transitions from dithiolene(π) to bipyridine(π\*), namely, interligand charge transfer (CT), π–π\*, and n–π\* transitions of the azobenzene unit, and π–π\* transitions of the bipyridine ligand. In addition, only __trans__‐**1** shows distinctive electronic bands, assignable to transitions from the dithiolene(π) to azobenzene(π\*), defined as intraligand CT. Complex **1** shows photoisomerization behavior opposite to that of azobenzene: __trans__‐to‐__cis__ and __cis__‐to‐__trans__ conversions proceed with 405 and 312 nm irradiation, which correspond to excitation with the intraligand CT, and π–π\* bands of the azobenzene and bipyridine units, respectively. In contrast, complex **2** shows photoi

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Author

Ryota Sakamoto; Shoko Kume; Manabu Sugimoto; Hiroshi Nishihara

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0947-6539)

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)