Two-photon absorption and two-photon induced blue emission characteristics of a series of heterocycle-based organic molecules are investigated experimentally and by quantum-chemical computations. The molecules consist of a typical A–π–A′ structure, where heterocycle, styryl and formyl groups are employed as A, π-conjugated and A′ moieties, respectively. Experimental results indicate that significant enhancements in the blue emission efficiency and two-photon absorption cross-sections can be achieved by replacing S and O atoms with an N atom in the heterocycle acceptor moiety, which is also supported by the quantum-chemical computations. Additionally, larger two-photon absorption cross-sections can be obtained by choosing appropriate solvents, as indicated by the computations.
The present invention relates to polysubsituted imidazole having formula 1 ##STR1## These compounds are useful for restoring the sensitivity of multidrug resistant cells to cancer chemotherapeutic agents.
本发明涉及具有式1的多取代咪唑。这些化合物对恢复多药耐药细胞对癌症化疗药物的敏感性是有用的。
Novel piperidine nitroxide derivatives: Synthesis, electrochemical and antioxidative evaluation
作者:Hongli Zhao、Juhua Wu、Xianjiang Meng、Shaohua Zuo、Wentian Wang、Huihui Yuan、Minbo Lan
DOI:10.1002/jhet.5570450212
日期:2008.3
Novel paramagnetic materials (3a, 3b, 4a and 4b) based on heterocyclic dyes (2a and 2b) and one stable nitroxide radical (4-NH2-TEMPO) were synthesized. EI-MS, elemental analysis and FT-IR spectral data confirmed the structures of the newly synthesized compounds. In addition, the cyclic voltammetry, the antioxidant activity and reactive oxygen species (ROS) scavenging properties of these compounds