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首页> 外文会议>ACS Symposium Series 890; Symposium on Nanotechnology and the Environment: Applications and Implications; ; >Luminescent Silole Nanoparticles as Chemical Sensors for Carcinogenic Chromium(Ⅵ) and Arsenic(Ⅴ)
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Luminescent Silole Nanoparticles as Chemical Sensors for Carcinogenic Chromium(Ⅵ) and Arsenic(Ⅴ)

机译：发光硅纳米颗粒作为致癌铬（Ⅵ）和砷（Ⅴ）的化学传感器

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The principle objective of the research described herein is to synthesize new materials for the selective sensing of carcinogenic chromium(Ⅵ) and arsenic(Ⅴ) containing species. Both metal ions have been proven to have serious adverse health effects and are regulated by the EPA. As it exists in its predominant environmental form, CrO_4~(2-) is isostructural with the sulfate ion (SO_4~(2-)); hence, sulfate transport proteins uptake CrO_4~(2-), wherein it damages DNA. Likewise, the predominant environmental form of As(V), AsO_4~(3-), is isoelectronic with PO_4~(3-), and so it competes in cellular uptake of phosphate." The EPA has set maximum contaminant level goals (MCLG) for chromium and arsenic at 0.10 and 0.05 ppm respectively. The enforcement of these regulations requires the development of sensitive and selective sensors for these carcinogens. Both chromate and arsenate are oxidizing agents, a property which may be exploited to effect their detection. It has recently been shown that silole containing polymers may be used as sensors specific for TNT and other nitroaromatic oxidant species. The method of detection is based on luminescence quenching of the silole polymer by the electron accepting analyte. Polysilole luminescence occurs from a LUMO stabilized by σ~*-π~* conjugation arising from the interaction between the σ~* orbital of the silicon chain and the π~* orbital of the butadiene moiety. Recently, it was reported that formation of methyl(phenyl)tetraphenylsilole colloids leads to a significant increase in luminescence. Although poly(tetraphenyl)silole is insensitive to simple inorganic oxidants, functionalization of the silole unit with hydrogen bonding substituents has been performed to incorporate binding regions for anionic oxidants, such as chromatc and arsenate. Nanoparticle colloids of poly(tetra-phenyl)silole show not only increased luminescence, but also much greater sensitivity in analyte detection.
机译：本文所述研究的主要目的是合成用于选择性检测致癌性铬（Ⅵ）和砷（Ⅴ）物种的新材料。两种金属离子均已证明对健康有严重不利影响，并受到EPA的管制。由于CrO_4〜（2-）以其主要的环境形式存在，所以它与硫酸根离子（SO_4〜（2-））同构。因此，硫酸盐转运蛋白摄取CrO_4〜（2-），从而破坏DNA。同样，As（V）的主要环境形式AsO_4〜（3-）与PO_4〜（3-）是等电子的，因此它在细胞吸收磷酸盐中竞争。” EPA设定了最大污染物水平目标（MCLG ）分别适用于0.10和0.05 ppm的铬和砷，执行这些法规要求开发用于这些致癌物的灵敏且选择性的传感器，铬酸盐和砷酸盐都是氧化剂，可以利用其特性进行检测。最近的研究表明，含硅醇盐的聚合物可用作TNT和其他硝基芳香族氧化剂的特有传感器，检测方法是基于电子接受分析物对硅醇盐聚合物的发光猝灭，而多分子硅酸盐的发光是由经σ〜稳定的LUMO产生的。硅链的σ〜*轨道与丁二烯部分的π〜*轨道之间的相互作用引起的*-π〜*共轭，最近有报道说甲基的形成（苯基）四苯基甲硅烷基胶体导致发光显着增加。尽管聚（四苯基）硅烷对简单的无机氧化剂不敏感，但是已经进行了具有氢键取代基的硅烷单元的功能化，以结合阴离子氧化剂的结合区域，例如铬酸盐和砷酸盐。聚（四苯基）硅烷的纳米胶体不仅显示出增强的发光，而且在分析物检测中也具有更高的灵敏度。

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