Deciphering the ultrafast dynamics of a new tetraphenylethylene derivative in solutions: charge separation, phenyl ring rotation and CC bond twisting

Intricate ultrafast dynamics of a tetraphenylethylene derivative with terphenyl groups in solutions of different viscosities. It forms a charge resonance structure (∼600 fs) to give ethylene bond twisting (∼9 ps) followed by phenyl rotation (∼30 ps).