Carbazole-, quinoline-, benzothiazole-, and stilbene-containing fluorescent gelators are synthesized by connecting gelation-driving segments, and their gelation abilities are studied with 13 solvents. Fibrous thin-layer films are prepared on quartz plates from the solutions or gels, and they are studied as chemosensors for explosives. Fluorescence quenching of the films upon exposure to saturated TNT or RDX vapor is used to evaluate the abilities of the films to detect explosives. The relationship between the thickness of the thin-layer film and the quenching efficiency upon exposure to TNT is studied. The morphologies of the thin-layer films are observed by dynamic force mode scanning probe microscopy and discussed with regard to their fluorescence quenching. The interactions among chromophores in the gels, thin-layer films, and solutions are studied by variable-temperature spectroscopy. The mechanism of TNT detection is discussed from the viewpoint of the HOMO and LUMO energy levels.
Substituent effects on the <sup>13</sup>
C NMR chemical shifts of the imine carbon in <i>N</i>
-(4-X-benzylidene)-4-(4-Y-styryl) anilines
作者:Zhengjun Fang、Chenzhong Cao、Guanfan Chen
DOI:10.1002/poc.3032
日期:2012.12
Long‐range electronic substituenteffects were targeted using the substituent dependence of δC(C═N), and specific cross‐interactions were explored extendedly. A wide set of N‐(4‐X–benzylidene)‐4‐(4‐Y–styryl) anilines, p‐X–C6H4CH═NC6H4CH═CHC6H4–p‐Y (X = NMe2, OMe, Me, H, Cl, F, CN, or NO2; Y = NMe2, OMe, Me, H, Cl, or CN) were prepared for this study, and their 13C NMR chemicalshifts δC(C═N) of C═N bonds
使用δC(C effectsN)的取代基依赖性来靶向远程电子取代基效应,并广泛地探索了特定的交叉相互作用。宽组ñ - (4-X -亚苄基)-4-(4--Y-苯乙烯基)苯胺,p -X-C 6 H ^ 4 CH═NC 6 ħ 4 CH = CHC 6 H ^ 4 - p -Y( X = NMe 2,OMe,Me,H,Cl,F,CN或NO 2; Y = NMe 2,OMe,Me,H,Cl或CN)用于本研究,并进行13 C NMR化学位移δ ç测定了C═N键的(C═N)。结果表明,取代基Y对两个电感和共振效应δ Ç的(C = N)p -X-C 6 H ^ 4 CH═NC 6 ħ 4 CH = CHC 6 H ^ 4 - p -Y不太比那些取代基的Y p -X-C 6 H ^ 4 CH═NC 6 ħ 4 - p‐Y。此外,随着共轭链的长度延长,C = N功能的电子特性对通过取代基X或Y的电子给予/电
STILBENE DERIVATIVES AND THEIR USE FOR BINDING AND IMAGING AMYLOID PLAQUES
申请人:Kung Hank F.
公开号:US20100266500A1
公开(公告)日:2010-10-21
This invention relates to a method of imaging amyloid deposits and to labeled compounds, and methods of making labeled compounds useful in imaging amyloid deposits. This invention also relates to compounds, and methods of making compounds for inhibiting the aggregation of amyloid proteins to form amyloid deposits, and a method of delivering a therapeutic agent to amyloid deposits.
Polymer modified adducts of epoxy resins and active hydrogen containing compounds containing mesogenic moieties
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0469492A2
公开(公告)日:1992-02-05
Polymer modified adducts are prepared by (A) reacting (1) an epoxy resin having an average of more than one vicinal epoxide group with (2) a compound containing an average of two or more hydrogen atoms reactive with an epoxide group; and (B) partially vinylizing reacting the product from step (A); and (C) polymerizing the partially vinylized product from step (B) with (3) a polymerizable ethylenically unsaturated monomer; with the proviso that at least one of the components (1), (2) or (3) contain one or more mesogenic or rodlike moieties. These adducts are useful as epoxy resin curing agents.
Adducts of epoxy resins and active hydrogen containing compounds containing mesogenic moieties
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0478918A2
公开(公告)日:1992-04-08
Adducts containing mesogenic or rodlike moieties are prepared by reacting (1) at least one compound containing an average of more than one vicinal epoxide group per molecule with (2) at least one compound containing an average of more than one reactive hydrogen atom per molecule; with the proviso that at least one member of components (1) and (2) contains a mesogenic or rodlike moiety. These compounds are useful as curing agents for epoxy resins.