Copolymer of divinyl ether and maleic anhydride (DVE-co-MA) derivatives of cis-platinum complexes were synthesized and characterized by elementary analysis, IR and XPS ( X-ray photoelectron spectroscopy). The behavior...Copolymer of divinyl ether and maleic anhydride (DVE-co-MA) derivatives of cis-platinum complexes were synthesized and characterized by elementary analysis, IR and XPS ( X-ray photoelectron spectroscopy). The behavior of the products in biological environment was also studied. UV-visible and fluorescence spectra show that these polymer derivatives are able to exchange ligands with selected nucleophilic groups in biological environment.展开更多
Carbazole and its derivatives may react with electron donor or acceptor to form various charge transfer complexes and serve as a new kind of organic semiconductor. The anions or cations of carbazole and its derivative...Carbazole and its derivatives may react with electron donor or acceptor to form various charge transfer complexes and serve as a new kind of organic semiconductor. The anions or cations of carbazole and its derivatives may play an important role in initiating the polymerization of various monomers and in polymer degradation proc-展开更多
The photophysical processes of 4-formacyl-triphenylamine (FTA) and 4,4’-bisformacyl-triphenyl-amine (BTA) have been studied. The fluorescences of FTA and BTA with donor (triamine) and acceptor (formacyl) moieties sho...The photophysical processes of 4-formacyl-triphenylamine (FTA) and 4,4’-bisformacyl-triphenyl-amine (BTA) have been studied. The fluorescences of FTA and BTA with donor (triamine) and acceptor (formacyl) moieties show the twisted intramolecular charge transfer (TICT) emission in polar solvents and photoinduced charge transfer (ICT) emission in nonpolar solvents. These could be supported by the solvent effect, temperature effect and the quenching process by strong electron-deficient compounds.展开更多
Both dimethyl terephthalate (DMTP) and dimethyl phthalate are able to form exciplex with 9-ethyl carbazole (EtCz) but the fluorescence quenching constant of DMTP to EtCz is larger than that of DMP to EtCz. The peak po...Both dimethyl terephthalate (DMTP) and dimethyl phthalate are able to form exciplex with 9-ethyl carbazole (EtCz) but the fluorescence quenching constant of DMTP to EtCz is larger than that of DMP to EtCz. The peak positions of the fluorescence bands of the exciplex formed from DMTP and DMP with EtCz are also different. The former gives a peak at shorter wavelength region. Either the exciplex formation rate constant k_3 or the exciplex dissociation rate constant k_4 is not alike. Both of these constants of DMTP are larger than those of DMP. All these results are difficult to explain with the established theory, so a new model which could be used to explain the results satisfactorily is supposed.展开更多
In this paper, 1H, 13C nuclear magnetic resonance （NMR） data of 14 carbazolc derivativesand 13C spin-lattice relaxation time of some derivatives are presented. The theoretical 1HNMR spectra of the carbazole ring pro...In this paper, 1H, 13C nuclear magnetic resonance （NMR） data of 14 carbazolc derivativesand 13C spin-lattice relaxation time of some derivatives are presented. The theoretical 1HNMR spectra of the carbazole ring protons in the 14 derivatives are calculated to matchthe experimental spectra by NMRCAL program. The effects of the carbazole ring on thechemical shifts of the protons and carbons of the R-group are discussed. The substituenteffects of carbazole ring on the α-H, β-H, α-C, β-C and v-C of the R-group are estimated. Itis found the the 1JCH of CH2 bonded to N in the R=--CH2--R’(R’=CnH2n+1),--CH2--O,--CH2--CH2--Br and--CH2--CH=CH2 derivatives are additive and can be expressed by 1JCH=8x+8y+8z,where 8x, 8y and εz are respectively the contributions of substituents x, y and z to 1JCH.展开更多
基金Project supported by the Science Fund of the Chinese Academy of Sciences.
文摘Copolymer of divinyl ether and maleic anhydride (DVE-co-MA) derivatives of cis-platinum complexes were synthesized and characterized by elementary analysis, IR and XPS ( X-ray photoelectron spectroscopy). The behavior of the products in biological environment was also studied. UV-visible and fluorescence spectra show that these polymer derivatives are able to exchange ligands with selected nucleophilic groups in biological environment.
文摘Carbazole and its derivatives may react with electron donor or acceptor to form various charge transfer complexes and serve as a new kind of organic semiconductor. The anions or cations of carbazole and its derivatives may play an important role in initiating the polymerization of various monomers and in polymer degradation proc-
基金Project supported by the National Natural Science Foundation of China
文摘The photophysical processes of 4-formacyl-triphenylamine (FTA) and 4,4’-bisformacyl-triphenyl-amine (BTA) have been studied. The fluorescences of FTA and BTA with donor (triamine) and acceptor (formacyl) moieties show the twisted intramolecular charge transfer (TICT) emission in polar solvents and photoinduced charge transfer (ICT) emission in nonpolar solvents. These could be supported by the solvent effect, temperature effect and the quenching process by strong electron-deficient compounds.
基金Project supported by the National Natural Science Foundation of China.
文摘Both dimethyl terephthalate (DMTP) and dimethyl phthalate are able to form exciplex with 9-ethyl carbazole (EtCz) but the fluorescence quenching constant of DMTP to EtCz is larger than that of DMP to EtCz. The peak positions of the fluorescence bands of the exciplex formed from DMTP and DMP with EtCz are also different. The former gives a peak at shorter wavelength region. Either the exciplex formation rate constant k_3 or the exciplex dissociation rate constant k_4 is not alike. Both of these constants of DMTP are larger than those of DMP. All these results are difficult to explain with the established theory, so a new model which could be used to explain the results satisfactorily is supposed.
文摘In this paper, 1H, 13C nuclear magnetic resonance （NMR） data of 14 carbazolc derivativesand 13C spin-lattice relaxation time of some derivatives are presented. The theoretical 1HNMR spectra of the carbazole ring protons in the 14 derivatives are calculated to matchthe experimental spectra by NMRCAL program. The effects of the carbazole ring on thechemical shifts of the protons and carbons of the R-group are discussed. The substituenteffects of carbazole ring on the α-H, β-H, α-C, β-C and v-C of the R-group are estimated. Itis found the the 1JCH of CH2 bonded to N in the R=--CH2--R’(R’=CnH2n+1),--CH2--O,--CH2--CH2--Br and--CH2--CH=CH2 derivatives are additive and can be expressed by 1JCH=8x+8y+8z,where 8x, 8y and εz are respectively the contributions of substituents x, y and z to 1JCH.
