Oda, Mitsunori published the artcileSynthesis and properties of 2-(2-pyridyl)-1-azaazulene, Formula: C5H6BNO2, the publication is Tetrahedron Letters (2007), 48(26), 4471-4475, database is CAplus.
The title azaazulene (I) was synthesized either by reaction of tropone with N-[(2-pyridyl)acetyl]pyridinium iodide in the presence of ammonium acetate or by palladium-catalyzed cross-coupling between 2-halo-1-azaazulene and 2-substituted pyridine. The compound shows relatively stronger basicity compared with 2,2′-bipyridyl. While I showed no emission from the S1 state but from the S2 state like azulene does, the protonated species of I exhibited emission from the S1 state. Cationic metal-dependent absorption and emission relating to complexation were also studied.
Tetrahedron Letters published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C5H6BNO2, Formula: C5H6BNO2.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem