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Full-Text Articles in Physical Sciences and Mathematics
Electronic Properties Of N(5)-Ethyl Flavinium Ion, Vincent Sichula, Pavel Kucheryavy, Renat Khatmullin, Ying Hu, Ekaterina Mirzakulova, Shubham Vyas, Samuel F. Manzer, Christopher M. Hadad, Ksenija D. Glusac
Electronic Properties Of N(5)-Ethyl Flavinium Ion, Vincent Sichula, Pavel Kucheryavy, Renat Khatmullin, Ying Hu, Ekaterina Mirzakulova, Shubham Vyas, Samuel F. Manzer, Christopher M. Hadad, Ksenija D. Glusac
Chemistry Faculty Publications
We investigated the electronic properties of N(5)-ethyl flavinium perchlorate (Et-Fl(+)) and compared them to those of its parent compound, 3-methyllumiflavin (Fl). Absorption and fluorescence spectra of Fl and Et-Fl(+) exhibit similar spectral features, but the absorption energy of Et-Fl(+) is substantially lower than that of Fl. We calculated the absorption signatures of Fl and Et-Fl(+) using time-dependent density functional theory (TD-DFT) methods and found that the main absorption bands of Fl and Et-Fl(+) are (pi,pi*) transitions for the S(1) and S(3) excited states. Furthermore, calculations predict that the S(2) state has (n,pi*) character. Using cyclic voltammetry and a simplistic consideration …
Ultrafast Optical Study Of Small Gold Monolayer Protected Clusters: A Closer Look At Emission, S. Hei Yau, O. Varnavski, John D. Gilbertson, Bert D. Chandler, G. Ramakrishna, T. Goodson
Ultrafast Optical Study Of Small Gold Monolayer Protected Clusters: A Closer Look At Emission, S. Hei Yau, O. Varnavski, John D. Gilbertson, Bert D. Chandler, G. Ramakrishna, T. Goodson
Chemistry Faculty Research
Monolayer-protected metal nanoclusters (MPCs) were investigated to probe their fundamental excitation and emission properties. In particular, gold MPCs were probed by steady-state and time-resolved spectroscopic measurements; the results were used to examine the mechanism of emission in relation to the excited states in these systems. In steady-state measurements, the photoluminescence of gold clusters in the range of 25 to 140 atoms was considerably stronger relative to larger particle analogues. The increase in emission efficiency (for Au25, Au55, and Au140 on the order of 10-5) over bulk gold may arise from a different mechanism …