Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Pyridine-3,5-dicarbonitrile, is researched, Molecular C7H3N3, CAS is 1195-58-0, about Photochemistry of dicyanopyridines.COA of Formula: C7H3N3.
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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