Synthesis And Photophysical Properties Of 3/5 Aryl Substituted 4H-Pyranone Derivatives

4H-pyranone is a good traditional fluorescent structural unit for the construction of electron donor-?-electron acceptor(D-?-A)type fluorescent materials.Its derivatives have attracted much attention due to their simple structure,easy synthesis,excellent photophysical properties and wide applications in the field of fluorescent sensing.In this paper,a series of 3/5 aryl substituted 4H-pyranone derivatives were synthesized by Suzuki coupling reaction with 4H-pyranone as the basic structural unit.A series of D-A-type 4H-pyranone derivatives were synthesized by introducing benzene,naphthalene,anthracene and pyrene into the3,5-position of pyran ring,it was found that the D-A-type 4H-pyranone derivatives have the fluorescence emission properties of intermolecular charge transfer state and local excited state,respectively,and exhibit the mechanochromic;The D-A-4H-pyranone derivatives synthesized by the introduction of electronic triphenylaniline units at 3/5 of the pyran ring show reversible photochromic properties.The D-A type 4H-pyranone derivatives synthesized by introducing electron donating carbazole units at the 3/5 position of pyran ring exhibit room temperature phosphorescence and photochromism;the near infrared(599-730nm)room temperature phosphorescent materials reported in rare literatures have been constructed by doping pyrene and pyrene derivatives as the guest molecules and benzophenone as the host molecules.