Abstract

A new series of four-coordinate boron compounds bearing a photochromic dithienylethene-containing C^C ligand and an ancillary N^C ligand have been successfully designed and synthesized.1 These compounds exhibit reversible photochromism upon photoexcitation with percentage conversions of 71–96% and readily tuneable photocycloreversion quantum yields by convenient modification of the ancillary ligand to turn on the thermally activated upconversion from the lower-lying unreactive excited state to the higher-lying photoreactive excited state.

Reference:

1. Fung, T. H.-C.;  Wong, C.-L.;  Tang, W.-K.;  Leung, M.-Y.;  Low, K.-H.; Yam, V. W.-W., Chem. Commun. 2022, 58 (26), 4231–4234.