title: Solution or solid - it doesn't matter: visible light-induced CO release reactivity of zinc flavonolato complexes.
abstract: Two types of zinc flavonolato complexes ([(6-Ph2TPA)Zn(flavonolato)]ClO4and Zn(flavonolato)2) of four extended flavonols have been prepared, characterized, and evaluated for visible light-induced CO release reactivity. Zinc coordination of each flavonolato anion results in a red-shift of the lowest energy absorption feature and in some cases enhanced molar absorptivity relative to the free flavonol. The zinc-coordinated flavonolato ligands undergo visible light-induced CO release with enhanced reaction quantum yields relative to the neutral flavonols. Most notable is the discovery that both types of zinc flavonolato derivatives undergo similar visible light-induced CO release reactivity in solution and in the solid state. A solid film of a Zn(flavonolato)2derivative was evaluated as an in situ CO release agent for aerobic oxidative palladium-catalyzed alkoxycarbonylation to produce esters in ethanol. The CO release product was found to undergo ester alcolysis under the conditions of the carbonylation reaction.
authors.affiliation: Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA. lisa.berreau@usu.edu.
authors.forename: Stacey N
authors.initials: SN
authors.lastname: Anderson
authors.affiliation: Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA. lisa.berreau@usu.edu.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Larson
authors.affiliation: Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA. lisa.berreau@usu.edu.
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Berreau