The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pyridine-3,5-dicarbonitrile, is researched, Molecular C7H3N3, CAS is 1195-58-0, about Photochemistry of dicyanopyridines, the main research direction is photochem dicyanopyridine UV laser flash photolysis.Application of 1195-58-0.
The photochem. of a variety of dicyanopyridines (2,3-, 2,4-, 2,5-, 2,6-, 3,4- and 3,5-dicyanopyridine) in solution at room temperature was investigated. Pulsed UV (308 nm) laser irradiation in deoxygenated acetonitrile yields the triplet state with lifetimes between 4 and 10 μs and absorption bands in the 400 and 320 nm regions. In the presence of added HCl an air-insensitive transient (τ≈10-12 μs, λmax≈360-380 nm) was observed, suggesting the formation of a protonated excited state. Irradiation in the presence of amines resulted in the production of the pyridyl radical anion (τ≈40-80 μs, air sensitive, λmax≈360-380 nm) formed by electron transfer from the amine to the pyridine triplet excited state. Stern-Volmer anal. gave electron transfer rate constants in the range (1-8)×10-8 M-1s-1. In methanol solvent, irradiation yielded an air-insensitive transient assigned as the neutral pyridyl radical (τ≈30-200 μs, λmax≈370-385 nm). The formation of these transients is discussed in the context of previous photochem. ESR and product studies.
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