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To be planar or to be twisted at the bridge junctions in biphenyls or biaryl types of molecular systems, are mainly dependent on two counter forces, (1) steric repulsions (destabilization)...

physical chemistry chemical physics/pccp. physical chemistry chemical physics

Planar in Brooker's Mode and Twisted in Reichardt's Mode: Defying the Steric Forces in Biphenyl Types of Zwitterionic Systems Through Metameric Resonance Stabilizations.