Study On The Photochemical Properties And Complexes Of Heteroarylethenes

Eight cross-photodimers of heteroarylethene, rctt-1-(2-benzoxazolyl)-2-phenyl-3- (4-pyridinyl)-4-phenylcyclobutane(BOPY), rctt-1-(2-benzoxazolyl)-2-phenyl-3- (5-phenyl oxazolyl)-4-phenylcyclobutane(BOPO), rctt-1-(5-phenyloxazolyl)-2-phenyl- 3-(4-pyridinyl) -4-phenylcyclobutane(POPY), rctt-1-(2-benzoxazolyl)-2-biphenyl-3-(4-pyridinyl)-4- phenylcyclobutane(BOPYbi), rctt-1-(2-benzoxazolyl)-2-(4-chlorophenyl)-3-(4-pyridinyl) -4-phenylcyclobutane(BOPYCl), rctt-1-(2-benzoxazolyl)-2-phenyl-3-(4-pyridinyl)-4- (4-chlorophenyl)cyclobutane(ClBOPY), rctt-1-(2-benzoxazolyl)-2-(4-chlorophenyl)-3- (5-phenyloxazolyl)-4-phenylcyclobutane(BOPOCl) and rctt-1-(2-benzoxazolyl)-2-phenyl- 3-(5-phenyloxazolyl)-4-(4-chlorophenyl)cyclobutane(ClBOPO), were synthesized from different heteroarylethene monomers in aqueous acidic solution upon the irradiation of Medium-Pressure Mercury Lamp (MPML, wave length>310nm). Their structures were determined by UV, IR, 1H NMR, 13C NMR, MS, Elemental analysis and single crystal structure. The photochemical properties of the cross-photodimers upon the irradiation of Low-Pressure mercury lamp (LPML) in dilute methanol solution was studied using UV and HPLC. It was found that the cross-photodimers underwent photolysis reaction in solution and it was proved that the cross-photodimer was only photolysized into the original monomers which have formed the cross-photodimer and no other monomers were detected in the solution.Two coordination complexes of 2-styrylbenzoxazole(BOEP) with CoCl2 and AgClO4 were synthesized, respectively. Four coordination complexes of photodimers of BOEP with CuCl2 and AgClO4 and photodimers of 2-styryl-5-phenyloxazole(POEP) with CuCl2 and CoCl2 were synthesized respectively. Their structures were determined by IR and X-ray crystal diffraction. It was found that the two ligands has a cis conformation in BOEPCo, whereas an anti conformation in BOEPAg. It was found that all of the four photodimmer coordination complexes are one-dimensional coordination polymers with a line structure. The cyclobutane ring of the photodimers was distorted because of the coordination.The industrialization of one-pot photosensitive emulsion containing polyvinyl alcohol- styrylpyridinium resins used for Silk Screen Printing were studied in this paper. The synthesis of the key intermediate, N-methyl-4-[2-(4-formylphenyl)ethenyl]pyridinium methosulfate was improved greatly to give a cleaner process. The improvement of the quality of the final product was also discussed.