Stabilization energy stable species

An explanation of the relationship between reaction rate and intermediate stability was first advanced in 1955. Known as the Hammond postulate, the argument goes like this transition states represent energy maxima. They are high-energy activated complexes that occur transiently during the course of a reaction and immediately go on to a more stable species. Although we can t... 

Thus, it might be said that in the gas phase, alkyllithium polyhedra of high stability are the hexamer and the tetramer and that the dimer, considerably higher in energy, is the next most stable species. 

Values of electron affinities of the neutral clusters are also an indication of the stability of the corresponding anionic clusters. In fact, it is important to check if the neutral system is able to attach an extra electron to form a stable species. The adiabatic electron affinity is given by the difference between the energy of the neutral system Lin, at its most stable geometry, and of the anionic Lin"... 

In order to lower the energy of the PC double bond for stabilization, ring systems are rather suitable indeed, for the first time, Dimroth and Hoffmann (4), with the phosphamethine cyanin cation, and later on Markl (5) and Ashe (6), with phosphabenzene, succeeded in synthesizing such molecules as stable species. 

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