Abstract
The closed-shell metalloporphyrins Hf(TPP)(OAc) 2 and Th(TPP)(acac) 2 (TPP=dianion of tetraphenylporphyrin, OAc=acetate, acac=acetylacetonate) display intraligand fluorescence and additional heavy-atom-induced intraligand phosphorescence, which is observed at room temperature in fluid solution and very efficiently quenched by O 2 with potential significance for the sensing of trace amounts of dioxygen.
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