Tuning the Chain Conformation of Pyrenyl-Pyridine Conjugated Oligomer Nanoprobe for Ultrasensitive Fluorescent Assaying of Fe and Ascorbic Acid.

The chain conformation of conjugated oligomers are critical for constructing ultrafine fluorescent nanoprobes with outstanding sensing performances owing to their suitable molecular flexibility and fine-tuned aggregation state. Herein, a series of pyrenyl-pyridine oligomers (OPPs) were designed and conveniently prepared by one-pot Sonogashira coupling of flexible 2,6-bis(ethynyl)pyridine with different rigid pyrene unit. Novel fluorescent nanoprobes (OPPNPs, ca.