In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Unusual blue-shifted acid-responsive photoluminescence behavior in 6-amino-8-cyanobenzo[1,2-b]indolizines, published in 2016, which mentions a compound: 21778-81-4, mainly applied to amino cyanobenzoindolizine preparation fluorescence pH effect protonation, COA of Formula: C10H9NO2.
6-Amino-8-cyanobenzo[1,2-b]indolizines, a new class of photoluminescent materials, exhibit reversible pH-dependent optical properties characterized by an uncommon and dramatic blue shift in fluorescence emission when protonated. Acid titration and NMR spectroscopy experiments reveal that, rather than the anticipated N-protonation, C-protonation and loss of aromaticity is responsible for the observed photophys. changes. Efficient synthesis from indole-2-carboxaldehydes makes variously substituted versions of this nucleus readily available to tune optical and pH effects.
There is still a lot of research devoted to this compound(SMILES：O=CC(N1)=CC2=C1C=CC(OC)=C2)COA of Formula: C10H9NO2, and with the development of science, more effects of this compound(21778-81-4) can be discovered.
Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem