A Tripodal Ruthenium(II) Polypyridyl Complex with pH Controlled Emissive Quenching

Autor:	Nicholas C. Fletcher, Nathan R. Halcovitch, Lefteris Danos, Rodney T. Brown
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	Aqueous solution Tertiary amine 010405 organic chemistry Chemistry Cryptand chemistry.chemical_element Protonation 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences Ruthenium Inorganic Chemistry Bipyridine chemistry.chemical_compound Electron transfer Acetonitrile
DOI:	10.1002/ejic.201800891
Popis:	A tripodal podand has been prepared and complexed to ruthenium(II) creating a metal complex with C3-symmetry and an enclosed cavity. The complex shows the anticipated enhanced emission when compared to [Ru(bipy)3]2+ in acetonitrile. The emission from this cryptand like structure is invariant to the introduction of monovalent cations in aqueous solution, but a significant drop in the emission was observed with increasing pH over a very broad pH range (3 to 12). This is attributed to an N to t2g electron transfer in the excited-state in the unprotonated form with a transfer rate of the order of 4.2 x 105 s-1. The crystal structure indicates the inclusion of water within the cavity suggesting that the protonation of a tertiary amine can be effectively moderated by a water molecule held in close proximity within a rigid cavity
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bb0ac93c02e2d7f6e934041659e4049 https://doi.org/10.1002/ejic.201800891 Zobrazit plný text záznamu