D-l-A分子修饰罗丹明底环及对其激发态的影响

通过乙基桥把供电子基团1,8-萘酰亚胺与罗丹明底环羧酸基相连,得到了两种以D-l-A(Donor-Acceptor-Line alkanes compounds)分子修饰罗丹明底环的化合物,并就合成中间体D-π-A(Donor-Acceptor-π-conjugated compounds)分子中哌嗪供电子基取代溴对1,8-萘酐母体基态和激发态的影响,以及对D-l-A分子修饰罗丹明底环对罗丹明母体D-π-A分子紫外可见吸收光谱和激发态的影响进行了研究。结果表明:用D-l-A分子修饰罗丹明底环时,D(Donor compound)的给电子能力越强,其吸收强度越大,其吸收紫外光而激发能力越强;在激发态下D-l-A体系发生了分子内能量传递,萘酰亚胺基团发生强烈的荧光猝灭,罗丹明底环接收能量激发罗丹明母体(D-π-A分子)发射特征荧光,D的给电子能力越强,其荧光强度越高。

The Influences of the D-l-A Molecule Modifying Rhodamine Bottom Ring on the Excited State of Rhodamine

The two kind of compound containing the donor group 1,8-napthalimide and the carboxyl of Rhodamine bottom ring linked via ethylene bridge that the Rhodamine bottom ring were modified by D-l-A (Donor-Acceptor-Line alkanes compounds) molecule were synthesized, the influences of the donor group piperazinyl substituting bromine in intermediate D-π-A molecule (Donor-Acceptor-π-conjugated compounds) on the ground state and excited state of 1,8- naphthalic anhydride and the influences of the D-l-A molecule modifying Rhodamine bottom ring on the ultraviolet and visible light absorbing spectrum and excited state of Rhodamine (D-π-A molecule) were studied. The experiment results showed that when the Rhodamine bottom ring were modified by D-l-A molecule, the D donor group ability was stronger, the absorbing intensity of compound became larger, the excited ability of the compound that absorbed UV (ultraviolet rays) light became stronger. Moreover, the occurrence of energy inner-molecule transfer in D-l-A system in excited state were observed, The fluorescence of the napthalimide group was intensely quenched, the D donor group ability was stronger, The fluorescence intensity that was eradiated by the Rhodamine bottom ring incepting energy to excite Rhodamine (D-π-A molecule) became higher.