摘要:
Photochromic materials, such as spiropyran dyes, are disclosed that can be used for high-density optical storage and molecular switches. According to the disclosure these compounds can be used as transducers in optical sensors. When the spiropyran dye absorbs UV light it switches to the merocyanine form, and this structure has an active binding site for cations. When cations bind to the site, the resulting colored complex has a new absorption band in the visible spectrum. By shining white or green light on the colored complex, the dye is reverted to the closed spiropyran form, and the cation is released. The disclosure optimizes the immobilization of the spiropyran dye onto a polymer substrate via long chain alkyl groups. These long chain alkyl linkers enable the dye to reversibly form the preferred merocyanine (2):(1) cation sandwich complex.
摘要:
An ion-selective polymeric membrane for an electrochemical sensor for use in analytical chemistry, comprisinga) a supporting matrix e.g. of PVC, andb) an ionophore selected from calixarene or oxacalixarene derivatives of the formula IV ##STR1## wherein n+m=3-8;m=0-8;n=0-8;a, which may be the same or different on each aryl group, is 0 or 1;R.sup.2 is alkyl, aryl, alkaryl, alkoxy, alkoxyalkoxy, aryloxy, alkaryloxy, alicyclic, alkylthio, arylthio, alkarylthio, or a substituted derivative thereof;R.sup.3 is --H, alkyl or alkenyl;X is --OH or a group containing an acrylate or methacrylate functional group;provided that when X is --OH, n is at least 1/2(n+m);and provided that when m=0, n=4, a=0 and R.sup.3 is alkyl or allyl, R.sup.2 is not alkoxy having 4 or more carbon atoms in the alkyl group;and provided that when m=0, n=4, a=0 and R.sup.3 is t-butyl, R.sup.2 is not methoxy or ethoxy;or of the formula V ##STR2## wherein R.sup.4 is alkyl; or polymers of those compounds of the formula IV in which X is a group containing an acrylate or methacrylate group.New compounds in which R.sup.2 is --SCH.sub.2 CH.sub.3 are described.Selectivity coefficients and slope measurements are given for the ionophores in PVC electrodes which are selective for sodium, potassium and caesium.
摘要翻译:一种用于分析化学中的用于电化学传感器的离子选择性聚合物膜,包括:a) 的PVC,和b)选自式IV的杯芳烃或氧杂七环芳烃衍生物的离子载体,其中n + m = 3-8; m = 0-8; n = 0-8; a在每个芳基上可以相同或不同,为0或1; R2是烷基,芳基,烷芳基,烷氧基,烷氧基烷氧基,芳氧基,烷氧基,脂环族,烷硫基,芳硫基,烷芳硫基或其取代衍生物。 R3是-H,烷基或烯基; X是-OH或含有丙烯酸酯或甲基丙烯酸酯官能团的基团; 条件是当X为-OH时,n为至少1/2(n + m); 并且条件是当m = 0时,n = 4,a = 0和R3是烷基或烯丙基,R2不是烷基中具有4个或更多个碳原子的烷氧基; 并且条件是当m = 0时,n = 4,a = 0和R3是叔丁基,R 2不是甲氧基或乙氧基; 或其中R 4是烷基的式V V 或其中X为含丙烯酸酯或甲基丙烯酸酯基团的式Ⅳ化合物的聚合物。 描述了其中R2是-SCH2CH3的新化合物。 对于对钠,钾和铯有选择性的PVC电极中的离子载体,给出了选择性系数和斜率测量。
摘要:
A photoresponsive ionogel comprising a photo-responsive polymer polymerised within an ionic liquid matrix is described. This solid-state electrolyte material maintains its ionic liquid characteristics but these characteristics can be altered upon irradiation of the gel with light of a particular wavelength. By suitably configuring the ionogel through the incorporation of specific ions within the gel it is possible to cause dramatic changes in properties of the ionogel such as viscosity, conductivity, acidity, basicity and polarity using light as the stimulus.
摘要:
A chemochromic sensor includes multiple bi-directional LEDs, each optically aligned with one or more test areas. Each LED is used as both a light emitter when driven in forward bias, and as a light detector when driven in reverse bias. By alternating the bias on the LEDs, multi-way light measurements of the test area can be obtained.
摘要:
A photoresponsive ionogel comprising a photo-responsive polymer polymerised within an ionic liquid matrix is described. This solid-state electrolyte material maintains its ionic liquid characteristics but these characteristics can be altered upon irradiation of the gel with light of a particular wavelength. By suitably configuring the ionogel through the incorporation of specific ions within the gel it is possible to cause dramatic changes in properties of the ionogel such as viscosity, conductivity, acidity, basicity and polarity using light as the stimulus.
摘要:
A flow analysis apparatus is disclosed. The flow analysis apparatus has at least one wicking channel fluidically coupled to an absorbent pump. A wicking valve is fluidically coupled to the wicking channel to provide a fluidic connection to the sample source where opening the wicking valve allows the absorbent pump to cause liquid to flow down the wicking channel toward the absorbent pump. Other similar wicking valves can be added to provide functions such as calibration and reagent addition. A detection unit allows for analysis of the liquid as it flows down the wicking channel.
摘要:
New chromoionophores of the formula IV ##STR1## wherein a=0-3, b=0 or 1, c =0 or 1, x=0 or 1, y=0 or 1, z=0 or 1,R', which may be the same or different in each aryl group, is H, halogen, hydrocarbyl, aryl, hydrocarbylaryl or a substituted derivative thereof;R, which may be the same or different, is hydrocarbyl, aryl, hydrocarbylaryl, or a substituted derivative thereofare useful in optical sensors or colourmetric reagents for clinical use particularly for lithium, When complexed with lithium, the chromoionophores of the invention and other calixarene derivatives can be used for detecting amines, particularly trimethylamine, as an indicator of fish spoilage.