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Environment

Chemistry In Pictures

Chemistry in Pictures: Color by solvent

January 23, 2018
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A series of panels shows crystals of various colors.
Credit: Cryst. Growth Des. 2018, DOI: 10.1021/acs.cgd.7b01417

Researchers at the University of Buea, in Cameroon, designed this color-changing chemical sensor. The metal-organic framework (MOF) material, {[Co(34pba)2(H2O)]·1/2DMF·H2O}n, absorbs a range of solvent vapors and responds with a characteristic color change (list below). The material gets its hue-shifting prowess from a phenomenon called solvatochromism, in which the solvent changes the chemical environment around the cobalt ions. The MOF could see use in workplace safety equipment and other applications involving the detection of hazardous solvent vapors.

The MOF before (center) and after exposure to solvents: (a) dichloromethane, (b) chloroform, (c) 1,1,1-trichloroethane, (d) trichloroethylene, (e) chlorobenzene, (f) methanol, (g) ethanol, (h) water, (i) 1,4-dioxane, (j) acetone, (k) DMF, (l) DMA, (m) DMSO.

Credit: Cryst. Growth Des. 2018, DOI: 10.1021/acs.cgd.7b01417

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Related C&EN Content:

C&EN’s Chemistry in Pictures: Solvatochromism

C&EN’s Chemistry in Pictures: Pure color

C&EN’s Chemistry in Pictures: More than meets the I

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