Two novel heteroatom-bridged his (benzo-12-crown-4 ether)s, i.e. his [2-nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for...Two novel heteroatom-bridged his (benzo-12-crown-4 ether)s, i.e. his [2-nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for 1. Ion selective electrodes (ISE) for Ag+, containing 1 and 2 in PVC membrane as neutral carriers, were prepared, and their selectivity coefficients for Ag^+ (K_(Ag.M)^(pot)) were determined against other heavy metal ions, alkali and alkaline-earth metal ions. and ammonium ion. These ISEs showed excellent Ag^+ selectivities, log K_(Ag.M)^(pot) ≤ -3.8, against most of the interfering canons examined, except for Hg^+.展开更多
25,27-Dipropoxy-p-tert-butylcalix[4]crown-9 cone conformer 5 was readily synthesized via an intramolecular cyclization strategy in good yields. The structures of all the new compounds involved were confirmed by NMR, E...25,27-Dipropoxy-p-tert-butylcalix[4]crown-9 cone conformer 5 was readily synthesized via an intramolecular cyclization strategy in good yields. The structures of all the new compounds involved were confirmed by NMR, ESI-MS and elemental analyses. All of them were proved to be in the cone conformation.展开更多
在普通杯芳烃中引入硫、氮原子可以改善普通杯芳烃的配合性能.在弱酸的催化下,使用硫杂杯[4]芳烃四酰肼衍生物3与芳醛衍生物4反应,高产率地合成了新型的含酰胺和席夫碱单元的硫杂杯[4]芳烃冠醚衍生物5,所合成的新化合物的结构经1 H NMR...在普通杯芳烃中引入硫、氮原子可以改善普通杯芳烃的配合性能.在弱酸的催化下,使用硫杂杯[4]芳烃四酰肼衍生物3与芳醛衍生物4反应,高产率地合成了新型的含酰胺和席夫碱单元的硫杂杯[4]芳烃冠醚衍生物5,所合成的新化合物的结构经1 H NMR、元素分析、ESI-MS等证实.同时探讨了新型硫杂杯[4]芳烃衍生物5与系列α-氨基酸的配合性能,结果表明所合成的硫杂杯芳烃冠醚对氨基酸分子表现出有效的配合能力和选择性.展开更多
A diester-calix[4]crown-4-ether bearing mono (azophenol) moiety shows a larger spectral change toward Ca2+ than other alkali and alkaline eafth cations.
文摘Two novel heteroatom-bridged his (benzo-12-crown-4 ether)s, i.e. his [2-nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for 1. Ion selective electrodes (ISE) for Ag+, containing 1 and 2 in PVC membrane as neutral carriers, were prepared, and their selectivity coefficients for Ag^+ (K_(Ag.M)^(pot)) were determined against other heavy metal ions, alkali and alkaline-earth metal ions. and ammonium ion. These ISEs showed excellent Ag^+ selectivities, log K_(Ag.M)^(pot) ≤ -3.8, against most of the interfering canons examined, except for Hg^+.
基金the Research Foundation of Tongji Medical College,Huazhong University of Science and Technology(No.25514107)Project Chenguang of Wuhan City(No.200750731267)for financial support.
文摘25,27-Dipropoxy-p-tert-butylcalix[4]crown-9 cone conformer 5 was readily synthesized via an intramolecular cyclization strategy in good yields. The structures of all the new compounds involved were confirmed by NMR, ESI-MS and elemental analyses. All of them were proved to be in the cone conformation.
基金the National Natural Science Foundation of China (No. 20371040) the Foundation (031-A21-004)of Gansu province and the Foundation (No. 02-18) of Northwest Normal University.
文摘在普通杯芳烃中引入硫、氮原子可以改善普通杯芳烃的配合性能.在弱酸的催化下,使用硫杂杯[4]芳烃四酰肼衍生物3与芳醛衍生物4反应,高产率地合成了新型的含酰胺和席夫碱单元的硫杂杯[4]芳烃冠醚衍生物5,所合成的新化合物的结构经1 H NMR、元素分析、ESI-MS等证实.同时探讨了新型硫杂杯[4]芳烃衍生物5与系列α-氨基酸的配合性能,结果表明所合成的硫杂杯芳烃冠醚对氨基酸分子表现出有效的配合能力和选择性.
文摘A diester-calix[4]crown-4-ether bearing mono (azophenol) moiety shows a larger spectral change toward Ca2+ than other alkali and alkaline eafth cations.
