Chemistry in Pictures: Color by solvent | Chemical & Engineering News

Issue Date: January 23, 2018

Chemistry in Pictures: Color by solvent

Department: Science & Technology
Keywords: Chempics, solvatochromism, colorful, MOFs
[+]Enlarge
Credit: Cryst. Growth Des. 2018, DOI: 10.1021/acs.cgd.7b01417
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

Do science. Take pictures. Win money. Enter our photo contest here.

Related C&EN Content:

For more Chemistry in Pictures, visit our new home on cen.acs.org.

 
Chemical & Engineering News
ISSN 0009-2347
Copyright © American Chemical Society

Leave A Comment

*Required to comment