Estrada, Leandro A.; Frances-Monerris, Antonio; Schapiro, Igor; Olivucci, Massimo; Roca-Sanjuan, Daniel published an article in 2016, the title of the article was Mechanism of excited state deactivation of indan-1-ylidene and fluoren-9-ylidene malononitriles.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile And the article contains the following content:
Herein, we report complementary computational and exptl. evidence supporting the existence, for indan-1-ylidene malononitrile and fluoren-9-ylidene malononitrile, of a non-radiative decay channel involving double bond isomerization motion. The results of UV-Vis transient absorption spectroscopy highlight that the decay takes place within hundreds of picoseconds. In order to understand the related mol. mechanism, photochem. reaction paths were computed by employing multiconfigurational quantum chem. The results indicate that the excited state deactivation occurs via concerted double bond twisting of the dicyanovinyl (DCV) unit coupled with a pyramidalization of its substituted carbon. It is also shown that the observed differences in the excited state lifetimes when passing from indan-1-ylidene malononitrile to fluoren-9-ylidene are associated with the change in the topog. of the conical intersection driving the decay from intermediate to sloped, resp. The experimental process involved the reaction of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile(cas: 2510-01-2).Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile
The Article related to indanylidene malononitrile fluorenylidene malononitrile excited state deactivation mechanism nonradiative, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts