Geometrical distortions compounds

The chemistry of cycloproparenes is characterized by the interplay of two contradictory effects, namely aromaticity which is generally known to stabilize compounds, and strain which destabilizes them. The fusion of a cyclopropene to a benzene ring results in geometrical distortions and strain which has consequences on the properties of the resulting cycloproparene. It perturbs the aromatic Ji-electron... 

The intensity distributions of well resolved vibronic spectra recorded in absorption and emission at low temperature are used to determine the geometric distortions of the electronically excited states of coordination compounds. In particular for complexes of lower symmetry, band analysis is necessary leading to results with which bond distance changes can be calculated. For spectra exhibiting no vibrational fine structure, a new technique is proposed which uses time resolved methods, considering deviations from the Poisson distribution of photons by recording time intervals between two successively emitted photons. 

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