Add time:07/12/2019         Source:sciencedirect.com

Free rotating azo type ligand in different types of metal complexes give trans-cis isomerism in presence of photon irradiation by UV light. For this connection one new iridium complex has been synthesized with 8-hydroxyquinoline-5-phenylazo ligand in which the azo part of the ligand is free from coordination with metal centre. UV light irradiation of the Ir complex with this type of 8-hydroxyquinoline-5-arylazo ligand at room temperature promotes the trans→cis photoisomerization of the NN bond with formation of a cis-isomer. The complex is characterised by single X-ray diffractometry, IR, mass and 1HNMR spectroscopy method. Here we report on the synthesis, the electrochemical properties and the photophysical characterization of donor-acceptor azobenzene derivative that possess 8-quinolinol group connected to a benzene moiety and it's cis-trans isomerisation reaction and stability of the isomers. Thoroughly DFT and TD-DFT calculations are performed to correlate experimental and theoretical interpretation.

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