Vapochromism
Encyclopedia
Vapochromism strongly overlaps with solvatochromism
since vapochromic systems are ones in which dyes change colour in response to the vapour or aroma of an organic compound or gas. Vapochromic devices are the optical branch of electronic noses.The main applications are in sensors for detecting VOCs in a variety of environments, including industrial, domestic and medical areas.
An example of such a device is an array consisting of a metalloporphyrin (Lewis acid), pH indicator dye and a solvatochromic dye. The array is scanned with a flat-bed recorder and the result compared with a library of known VOCs. Vaporchromic materials are sometimes Pt, or Au complexes. They give off a distinct color change when exposed to VOC
Solvatochromism
Solvatochromism is the ability of a chemical substance to change color due to a change in solvent polarity. Negative solvatochromism corresponds to hypsochromic shift with increasing solvent polarity and positive solvatochromism corresponds to bathochromic shift with increasing solvent polarity...
since vapochromic systems are ones in which dyes change colour in response to the vapour or aroma of an organic compound or gas. Vapochromic devices are the optical branch of electronic noses.The main applications are in sensors for detecting VOCs in a variety of environments, including industrial, domestic and medical areas.
An example of such a device is an array consisting of a metalloporphyrin (Lewis acid), pH indicator dye and a solvatochromic dye. The array is scanned with a flat-bed recorder and the result compared with a library of known VOCs. Vaporchromic materials are sometimes Pt, or Au complexes. They give off a distinct color change when exposed to VOC