NDLI: Synthesis of Pd complexes directly linked to the light-absorbing $[(bpy)_{3}Ru]^{2+}$ unit and their photochemical reactions toward styrenes

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Inagaki, Akiko Nakagawa, Hiroki Akita, Munetaka Inoue, Keiichi Sakai, Makoto Fujii, Masaaki
Description	Author Affiliation: Inagaki A ( Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan. inagaki.a.aa@m.titech.ac.jp)
Abstract	A series of bipyridyl –Pd and Rh complexes containing a $[(bpy)_{3}Ru]^{2+}$ or $[(bpy)_{2}Ru(phen)]^{2+}$ ( bpy = 2,2′-bipyridyl , phen = 1,10-phenanthroline ) moiety as visible-light absorbing unit was synthesized. The complexes were synthesized via a Suzuki–Miyaura coupling reaction between the Ru complexes having a 4-bromo-2,2′-bipyridyl ligand and a 2,2′-bipyridyl-4-boronic acid and a subsequent reaction with various mononuclear Pd and Rh precursors. There was a noticeable structural difference between the QP (2,2′:4′,4″:2″,2‴-quaterpyridyne) and PB (5-(2,2′-bipyridyl)-yl-1,10-phenanthroline) complexes, which involved the dihedral angles within the bridging ligand ; the PB complexes possessed large dihedral angles but the QP complexes showed small values. This structural difference clearly indicated a strong π-conjugation through the QP ligand . The electrochemical and photophysical properties of the QP and PB complexes were compared with the parent mononuclear Ru complexes, such as $[(bpy)_{3}Ru]^{2+},$ $[(bpy)_{2}Ru(phen)]^{2+},$ and $[(bpy)_{2}Ru(bpm)]^{2+}$ (bpm = 2,2′-bipyrimidine ). The QP and PB complexes showed a $^{3}MLCT$ life time that was similar to $[(bpy)_{3}Ru]^{2+}$ and $[(bpy)_{2}Ru(phen)]^{2+},$ which was about 10 times longer (ca. 1 μs) than the corresponding bpm complexes. Reactivity studies with Pd complexes toward styrene dimerizations were examined. The reaction proceeded under visible-light irradiated conditions and the reactivity of the QP complexes was much higher than the corresponding PB complexes. Substantial acceleration of the reaction was observed with the introduction of an Me substituent on the bipyridyl ligand .
ISSN	14779226
Journal	Dalton Trans.
Issue Number	47
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-12-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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