Investigation On The Multiple Stimuli-responsive Behaviors Of Donor-acceptor Stenhouse Adducts

Organic photochromic materials have wide application prospects in photosensitive switches,sensors and optical information storage.After decades of research,many organic photochromic materials have emerged.These photochromic compounds usually need to use high-energy ultraviolet light to trigger photochemical reactions.This hinders their use in biomedicine and materials science.This paper focuses on a new type of organic photochromic materials adduct Stenhouse Donor-receptor(Donor-Acceptor Stenhouse Adducts,DASAs).With the traditional photochromic materials(spiropyrane,benzoyl naphthoquinones and capture spermatimide,azobenzene compound),DASAs with visible light trigger discoloration,at the same time also has the advantages of high sensitivity and high fatigue resistance,light in optical switches,sensors,biological medicine,optoelectronic devices,and other fields has a potential application prospect.The research content of this article is divided into four parts:The first part focuses on the current research progress of organic photochromic materials and the application prospects of organic photochromic materials in this field.The second and third sections use N,N,N'-trimethylethylenediamine and 5-(furan-2-ylmethylene)-1,3-dimethylpyrimidine-2,4,6(Reaction of 1H,3H,5H)-trione and N-ethyl-2-pyridinemethylamine and 5-(furan-2-ylmethylene)-2,2-dimethyl-1,3-dioxane Two new DASAs organic compounds(5 and 9)were successfully prepared by the reaction of alkane-4,6-dione,and their structures,properties and stimulus-response behaviors were studied in depth.We used ¹H NMR,¹³C NMR,two-dimensional spectrum,IR,HRMS and other analytical methods to confirm that there are three isomers in the two compounds mentioned above:the ring-opening structure of the triene in purple/red and the two weakly absorbing in the visible region Closed loop structure.These isomers are rich in properties,and the isomers can be converted by light,acid,base,metal ion and other stimuli.The ring-opening isomer 5a/9a exhibits photochromic properties in many solvents,and is converted to the isomer 5b/9b under visible light irradiation,accompanied by obvious color changes.Isomers 5a/9a and 5b/9b can be converted into cyclopentenone ring-closing isomers 5c/9c under the action of a base,which is also accompanied by a significant change in color.With the above-mentioned alkali stimulation-induced isomerization,selective and visual detection of primary amines was achieved.Isomer 5c and isomer 9a can achieve selective detection of Al³⁺and Cu²⁺,respectively,and have the advantages of strong anti-interference and high sensitivity.The fourth part gives a brief summary and outlook of the whole work.