80641-41-4

Upstream product

• 20111-34-6 (E)-1-methyl-4-(2-phenylethenyl)pyridinium iodide 
• 5097-92-7 (Z)-4-styrylpyridine 
• 74-88-4 methyl iodide 
• 872-85-5 pyridine-4-carbaldehyde 
• 1449-46-3 benzyltriphenylphosphonium bromide 

Downstream Products

• 20111-34-6 (E)-1-methyl-4-(2-phenylethenyl)pyridinium iodide 
• 93304-98-4 cis-N-methyl-3-(β-styryl)pyridinium chloride 

Relevant academic research and scientific papers

Charge transfer fluorescence of trans-stryrylpyridinium iodides

The photoprocesses of trans-1-methyl-4-[4-R-styryl]pyridinium iodide (R = H, P1) and derivatives with a cyano, a nitro and a methoxy group at the phenyl moiety, P2-P4, respectively, were studied in solution. In solvents of relatively low polarity, e.g. tetrahydrofuran, where contact ion pairs are present, the fluorescence spectrum of the styrylpyridinium is significantly red-shifted and the quantum yield is strongly enhanced. These findings are due to photoinduced electron transfer from I- to the excited singlet state of the cation. The features of complementary trans-styrylquinolinium iodides are in good accordance.

Photochemical behavior of micellized 4-(4′-alkylstyryl)pyridinium salts

New photochromic surfactants, l-alkyl-4-(4′-alkylstyryl)lpyridinium halides (CnStzRX; n = 0, 4, 6, 8; R = Me, Et, CH2CH2OH, n-Bu, n-C9H19; X = Br, I), were synthesized and the photochemical behavior of their micellar aggregates in water was characterized in relation to non-micellizing l-methyl-4-stilbazolium ions. Reversible trans-cis isomerization through a photothermal cycle was observed for the micellized CnStzRX. Furthermore, photoreactions upon prolonged irradiation of CnStzRX micelles resulted in a 3-31% formation of thermodynamically least stable syn-head-to-head and ca. 3% of anti- head-to-head dimers. These findings indicate that the self aggregation process of CnStzRX may provide some topologically organized microenvironment affecting the steric and like-charge repulsions of the aggregate components.

Photoinduced Electron Transfer vs. Trans -> Cis Photoisomerization of Quaternary Salts of 4-Substituted 4'-Azastilbenes (R = CN, H, CH3, and OCH3) and Their Quinolinium Analogues.

A series of quaternary salts of trans-1-alkyl-4-pyridinium and -quinolinium (At+X-; R = CN, H, CH3, and OCH3, X- = I- and ClO4-) were studied in solution by using steady-state irradiation and pulse excitation methods.A transient, observed by pulse radiolysis (iodide or perchlorate) and laser flash photolysis (248 nm; iodide only) in polar solvents, is assigned to the radical A, formed by one-electron reduction of At+.A radical was also produced by laser excitation (353 nm) of At+ in the presence of electron donors (D: I-, SCN-, and amines, e.g.DABCO, triethylamine, and dimethylaniline) at high concentrations.The quantum yield of trans -> cis photoisomerization (Φt->c) decreases on increasing and the yield of A radical shows the corresponding increasing dependence.On direct excitation of At+ the electron-transfer process occurs mainly via static fluorescence quenching and on sensitized excitation via dynamic triplet quenching.In solvents of moderate polarity (e.g. dichloromethane) where the salts are present as ion pairs, Φt->c is stongly reduced for the iodides as compared to the perchlorates.Photoinduced electron transfer and trans -> cis photoisomerization via the singlet mechanism are competing processes also for the ion pair.At lower temperatures the yield of formation of A radical is reduced and Φt->c correspondingly enhanced.

Electron-relay Chain Reaction of N-Methyl-4-β-styrylpyridinium Ion on Colloidal Silica

The effect of colloidal silica on the (2+)-sensitized photochemical cis-trans isomerization of N-methyl-4-β-styrylpyridinium (cis-MSP(1+)) ion induced by one-electron transfer has been studied.An efficient electron-relay chain reaction has been

Electron-Relay Chain Mechanism in the Sensitized Photoisomerization of Stilbazole Salts in Aqueous Anionic Micelles

Cis to trans isomerization of N-methyl-4-(β-styryl)pyridinium halide (4-MSPX, X=I or Cl) via electron-transfer sensitization by Ru(bpy)3(2+) has been studied for some micellar systems under the illumination of 468+/-5 nm light.Efficiencies for the isomeri

Visible-Light-Sensitized Cis-Trans Isomerization of N-Methyl-4-(β-styryl)pyridinium Ions

Cis-trans isomerization of N-methyl-4-(β-styryl)pyridinium ions (1) is sensitized by visible-light absorbers such as tris(2,2'-bipyridine)ruthenium 2+> and tetraphenylporphyrin complexes (MTPP).The predominance of the trans isomer at t