Azobenzene-Appended Bis-Cyclometalated Iridium(III) Bipyridyl Complexes

Autor:	Eva García-Lecina, Ainara Telleria, Zoraida Freixa, Ainhoa Altube, Abel de Cózar, Jorge Pérez-Miqueo
Rok vydání:	2015
Předmět:	Ligand Organic Chemistry Cationic polymerization Relaxation process chemistry.chemical_element Photochemistry Inorganic Chemistry Photochromism chemistry.chemical_compound chemistry Azobenzene Polymer chemistry Iridium Physical and Theoretical Chemistry Isomerization
Zdroj:	Organometallics. 34:5513-5529
ISSN:	1520-6041 0276-7333
Popis:	A new synthetic route toward photochromic azobenzene-appended bipyridyl ligands has been developed, and 20 new cationic iridium(III) bis-cyclometalated complexes containing up to four azobenzene fragments on their structure have been synthesized and characterized electronically and spectroscopically. These compounds incorporate photochromic azobenzene units in their neutral pyridyl ligands 1–5, and in four of them azobenzenes have been also introduced a posteriori on their phenylpyridyl ligands by palladium-catalyzed cross-coupling. UV–vis-monitored light-triggered trans-to-cis isomerization of the azobenzene-appended ligands revealed a strong inhibition of this process upon coordination to the d6-metal ion. TD-DTF calculations revealed that this inhibition could be a consequence of a metal to ligand charge transfer relaxation process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8710b04e75ffbf284dfadba25d0533b8 https://doi.org/10.1021/acs.organomet.5b00838 Zobrazit plný text záznamu