Hajime Yagi

Synthesis and Electronic Structure of Dicyanofulvene-Fused Electron Accepting Molecule Based on a 1,5-Dihydro-s-Indacene Framework

A novel dicyanofulvene dimer fused to a benzene ring (3a) has been synthesized as an electron-accepting molecule. The low-lying LUMO level was validated by measuring the ultraviolet photoelectron spectroscopy and electronic spectra. Cyclic voltammetry exhibited sequential reversible waves from 3a to 3a(4-) in a range of -0.30 to -2.14 V (vs Fc/Fc(+)). The electronic structure of 3a and its anionic species (3a(•-), 3a(2-), 3a(3•-), and 3a(4-)) were investigated by electronic spectra and X-ray crystallographic analyses.

Dissociative photoionization of perfluorocyclobutane and cis-1,1,2,2,3,4-hexafluorocyclobutane

Ion yield spectra produced by the photoionization of perfluorocyclobutane (c-C4F8) and cis-1,1,2,2,3,4-hexafluorocyclobutane (cis-c-C4H2F6) have been measured in the photon energy range of 25-170 eV. For the c-C4F8 photoionization, the C3F5+ and C2F4+ fragments are most abundant at all the energies, but the yields decline with the energy, giving at 170 eV about 30% of the yields at 30 e V. The C3H2F3+ and C2HF3+ ions are the most dominant fragments for the cis-c-C4H2F6 photoionization, with their yield curves similar to the C3F5+ and C2F4+ counterparts for c-C4F8, respectively. Photoelectron–photoion–photoion coincidence spectra were also acquired to study the breakdown pathways.