A double bond with weak σ- and strong π-interactions is still a double bond

Planar tetracoordinate carbons with a double bond in CAl3E clusters.

The potential energy surfaces of a series of clusters with the formula CAl3E (E = P, As, Sb, Bi) are systematically explored using density functional theory and high level ab initio calculations. The global minimum structure of these clusters contains a planar tetracoordinate carbon atom. The presence of a C=E double bond is supported by the Wiberg bond indices, the adaptive natural density par...

Experimental Analysis of a Vertical, Double-Effect Diffusion Solar Still

A trapped double bond-photoisomerization intermediate in a bacterial photoreceptor

Isomerization around a C=N double bond and a C=C double bond with a nitrogen atom attached: thermal and photochemical routes.

The Longuet-Higgins phase change theorem is used to show that, in certain photochemical reactions, a single product is formed via a conical intersection. The cis-trans isomerization around the double bond in the formaldiminium cation and vinylamine are shown to be possible examples. This situation is expected to hold when the reactant can be converted to the product via two distinct elementary ...

Double Pancake Bonds: Pushing the Limits of Strong π–π Stacking Interactions

The concept of a double-bonded pancake bonding mechanism is introduced to explain the extremely short π-π stacking contacts in dimers of dithiatriazines. While ordinary single pancake bonds occur between radicals and already display significantly shorter interatomic distances in comparison to van der Waals (vdW) contacts, the double-bonded pancake dimer is based on diradicaloid or antiaromatic ...