quinonoid

American  

[kwin-uh-noid, kwi-noh-noid] / ˈkwɪn əˌnɔɪd, kwɪˈnoʊ nɔɪd /

Also quinoidal

adjective

Chemistry.

1. of or resembling quinone.

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quinonoid British  

/ ˈkwɪnəˌnɔɪd, kwɪˈnəʊnɔɪd /

adjective

1. of, resembling, or derived from quinone

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Etymology

Origin of quinonoid

First recorded in 1875–80; quinone + -oid

Example Sentences

In recent years chemists have begun to regard the constitution of nearly all dyestuffs as similar to that of Quinone, and some even believe that all coloured organic compounds have a quinonoid structure.

From Project Gutenberg

Ligno-celluloses.—These compounds have many of the characteristics of the cellulose esters; they are in effect ethereal compounds of cellulose and the quinonoid lignone complex, and the combination resists hydrolysis by weak alkalis or acids.

From Project Gutenberg

The quinonoid structure of many coloured compounds has been proved experimentally, as, for example, by Hewitt for the benzene-azo-phenols, and Hantzsch for triaminotriphenyl methane and acridine derivatives; but, at the same time, many substances cannot be so explained.

From Project Gutenberg

Solution in dilute alkali was supposed to be accompanied by the rupture of the lactone ring with the formation of the quinonoid salt shown in 2.

From Project Gutenberg

Hantzsch explains the transformation of the colourless acid into red salts, which on standing yield more stable, colourless salts, by the following scheme:— He has also shown that the nitrophenols yield, in addition to the colourless true nitrophenol ethers, an isomeric series of coloured unstable quinonoid aci-ethers, which have practically the same colour and yield the same absorption spectra as the coloured metallic salts.

From Project Gutenberg