UV–VIS emission properties of poly(4-vinylpyridine) and its derivatives: Solid state ionization and quaternization of the pyridine rings

Luminescence of Betaine-30 Dispersed in Polymeric Solids

“…Fluorescence spectra and a kind of 2-D expression of emission and excitation spectra (excitation emission matrix:EEM [9,13], once we called it as ''emission counter map'' [10][11][12], we found its generic name in Ref. [9] was determined with Hitachi F-4500 Fluorescence Spectrophotometer using a reflection configuration to decrease re-absorption of the emission [13].…”

Ultraviolet Irradiation Effects on and Depth Profiles in X-ray Photoelectron Spectra of Poly(vinylpyridine) Thin Films

“…In our previous experiments on the UV irradiation of PVPy, a long emission band in the visible wavelength range, excited at a visible wavelength, was observed after UV irradiation, [4][5][6][7][8][9] and it was absent from those of acidtreated PVPy without UV irradiation. 6,8) To control the chemical states of PVPy surfaces, we needed to elucidate the changes occurring with UV irradiation.…”

“…In our previous experiments on the UV irradiation of PVPy, a long emission band in the visible wavelength range, excited at a visible wavelength, was observed after UV irradiation, [4][5][6][7][8][9] and it was absent from those of acidtreated PVPy without UV irradiation. 6,8) To control the chemical states of PVPy surfaces, we needed to elucidate the changes occurring with UV irradiation. A small model molecule, 1,4-dimethyl-pyridinium p-toluenesulfonate (DMP), in solid form and in acetonitrile solutions at low temperature and room temperature 31) showed a long wavelength (long ) emission band similar to those that we classified as ''D'' or ''V'' in our reports.…”

“…1), and its derivatives. [2][3][4][5][6][7][8][9][10] Today, PVPy is often used for nanostructured materials. The first observation of pyridine (Py) fluorescence was reported in the 1970s, 11) because Py has very low fluorescence quantum yield.…”

“…Many investigations on the luminescence of PVPy concerns not only PVPy, but also its protonated species. [12][13][14][15][16][17][18][19][20][21] Protonated-PVPy is made by adding proton donors 6,8,[14][15][16][17] or photoexcitation. 12) Py moieties in PVPy and other nitrogen-containing molecules are known to form not only ionic states but also hydrogen-bonded states, and their differences in electron densities have been shown by various X-ray spectroscopies, such as X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy, and near-edge X-ray absorption fine-structure spectroscopy.…”