Figure 1. (A ) Chemical structure of 1-methy-1,2,3,4,5-pentaphenylsilole. Adapted with permission.[8] Copyright 2001, Royal Society of Chemistry (B ) Restriction of Intramolecular Rotation (RIR) effect of 1,1,2,2-tetraphenylethene (TPE), and (C ) Restriction of Intramolecular Vibration (RIV) effect of 10,10’,11,11’-tetrahydro-5,5’-bidibenzo[a,d ][7]annulenylidene (THBDBA). Adapted with permission.[13] Copyright 2022, Wiley-VCH.