Topic
Vapours
About: Vapours is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 15022 citations.
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5 citations
01 Jan 1989
5 citations
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TL;DR: In this article, molybdenum and tungsten trioxides, prepared by heating the solid oxides under vacuum, have been reacted with organic compounds and some inorganic halides at −196 °C.
Abstract: Vapours of molybdenum and tungsten trioxides, prepared by heating the solid oxides under vacuum, have been reacted with organic compounds and some inorganic halides at –196 °C. Complexes of the trioxides are formed with pentane-2,4-dione, acetone, formic acid, and methanol, but the oxides fail to bring about metathesis or isomerisation of olefins. Oxygen–halogen exchange reactions occur between the trioxides and BCl3, SiCl4, and HCl; PCl3 is oxidised. The reactivity of the condensed vapours of both oxides at –196 °C is markedly higher than the reactivity of the normal solid oxides at room temperature.
5 citations
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5 citations
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TL;DR: In this paper , a dynamic 3D covalent organic framework (dynaCOF) constructed from an environmentally sensitive fluorophore can undergo concerted and adaptive structural transitions upon adsorption of gas and vapours.
Abstract: Molecular recognition is an attractive approach to designing sensitive and selective sensors for volatile organic compounds (VOCs). Although organic macrocycles and cages have been well-developed for recognising organics by their adaptive pockets in liquids, porous solids for gas detection require a deliberate design balancing adaptability and robustness. Here we report a dynamic 3D covalent organic framework (dynaCOF) constructed from an environmentally sensitive fluorophore that can undergo concerted and adaptive structural transitions upon adsorption of gas and vapours. The COF is capable of rapid and reliable detection of various VOCs, even for non-polar hydrocarbon gas under humid conditions. The adaptive guest inclusion amplifies the host-guest interactions and facilitates the differentiation of organic vapours by their polarity and sizes/shapes, and the covalently linked 3D interwoven networks ensure the robustness and coherency of the materials. The present result paves the way for multiplex fluorescence sensing of various VOCs with molecular-specific responses.
5 citations