No abstract

Functional dyes with a chromeno­[b]­quinoline skeleton (3a–d) were synthesized by one-step cyclization between coumarin derivatives and aromatic amines under the promotion of anhydrous aluminum chloride in 41.2–45.8% yields. Their maximum absorption and emission wavelengths locate at 358–396 and 420–603 nm with large Stokes shifts (168–231 nm), and their intramolecular charge transfer has been corroborated by density functional theory calculations. Cell experiments have proved that the probes 3a–c possess the ability to target lipid droplets.

As an alkaloid, quinazolinone exhibits excellent biological properties, structurally, it also has the potential to construct fluorescent probes with conjugated structures. In this work, probes 5a-c and 6b were obtained...

A series of viscosity probes targeting different organelles were obtained using a single hemicyanine dye as the matrix structure. Specifically, probes 1a-d were obtained by introducing four amines (6-amino-2H-chromen-2-one, N-(2-aminoethyl)-4-methylbenzenesulfonamide,...