Synthesis and Nonlinear Properties of Poly[1,4-bis(4-methylpyridinium)butadiyne triflate)]

Synthesis and nonlinear properties of poly[1,4‐bis(4‐alkylpyridinium)butadiyne triflate]

“…Because 2a was found to afford the 1,4‐addition polydiaetylene by the thermal treatment as reported in a previous article,6 similarly 2b was thermally converted into the polymer. DSC analysis of 2b showed the small endothermic peak at 198 °C as a result of a crystal transition before melting at 215 °C, and the exothermic peak at 218 °C from which the heat of polymerization Δ H was estimated to be 37.6 kcal/mol as much as the value of conventional 1,4‐addition polymerization [Fig.…”

“…The change in the triflate did not provide significant differences in the values of poly 2a and poly 2b , although 2b and poly 2b tended to slightly increase in value despite the less α, except 2b at 650 nm. Therefore, the higher χ (3) value of 2.2 × 10 −10 esu for poly 2a that was previously determined by the DFWM method seems to depend on the wavelength measured at 532 nm including the more resonant region 6. Furthermore, the Z‐scan method that can be used for two‐photon‐absorption detection was applied to poly 2a , poly 2b , 2a , and 2b on the open aperture condition, but no two‐photon absorption for them was detected in wavelengths from 650 to 1015 nm.…”

“…1,4‐Bis(4‐methylpyridinium)butadiyne triflate thus obtained was grown into a large single crystal that was suitable for the solid‐state polymerization to provide the polydiacetylene soluble in common solvents. The χ (3) was determined by the degenerate four‐wave mixing (DFWM) method to afford the value of 2.2 × 10 −10 esu at 532 nm 6. The determination of χ (3) has been carried out by various methods such as DFWM, third harmonic generation (THG), and Z‐scan in which sometimes the χ (3) values are different because of the varied wavelengths used for their measurements, and specifically become larger when the resonant region can be included in the measured wavelength.…”

Electro-optical properties of poly(2-ethynyl-N-propargylpyridinium compound) with different counter ions

“…The polymers having a conjugated backbone are expected to show unique properties such as electrical conductivity, paramagnetism, migration and transfer of energy, color, and chemical reactivity and complex formation ability [9]. Because of these properties, polyacetylene and its homologues have been promising as organic semiconductors [20,21], as membranes for gas separation and for liquid-mixture separation [13], as chiro-optical materials [22,23], as side-chain liquid crystals [10,24,25], as materials for chemical sensors [26], and as materials for nonlinear optical property [27][28][29] and for photoluminescence and electroluminescence properties [30][31][32][33][34][35][36][37][38].…”

Synthesis and Chemical Properties of Diacetylenes with Pyridinium and 4,4′‐Bipyridinium Groups

“…The reaction of 3 with 1 or 1-(2,4-dinitrophenyl)pyridinium chloride (6) in a 1 : 2 molar ratio afforded 7 (DBPyDA) or 8 (PyDA(Cl)) in 60% and 42% yield, respectively (Scheme 2). It has been reported that the chemical properties and polymerization behavior of DAs with pyridinium rings depend on their counter anions [12]. Among the counter anions, TCNQ À (radical anion) can form pyridinium salts that exhibit unique optical and electrical properties (TCNQ ¼ 2,2'-(cyclohexa-2,5-diene-1,4-diylidene)bis[propanedinitrile]) [13].…”