2H‑Bis-1,2,3-triazolo-isoquinoline: Design, Synthesis, and Photophysical Study

An efficient three-step synthesis of a new heterocyclic system is described wherein the 2H-bis­([1,2,3]­triazolo)­[5,1-a:4′,5′-c]­isoquinoline ring system is elaborated using a simple synthetic strategy. The approach permits the preparation of target compounds in high yields using readily available arylhydrazines and o-alkynylbenzaldehydes as starting materials. The photophysical properties of the prepared heterocycles were studied to demonstrate that the prepared compounds are attractive blue-emitting fluorophores, exhibiting quantum yields up to 98% and Stokes shifts up to 67 nm. A strong effect of the steric hindrance on the absorption and emission spectra was revealed.