| 释义 |
viologen Chem.|vaɪˈəʊlədʒən|
[f. violet n.1 + -o + -gen.]
Any of several salts of the 1, 1′-dialkyl-4,4′-bipyridylium ion, ({b1}C5H4N+.R)2 , which are used as redox indicators.
1933Michaelis & Hill in Jrnl. Gen. Physiol. XVI. 859 The new indicators will be designated as viologens... They differ from other indicators in several respects; in the first place, the color is exhibited by the reduced form, whereas usually the oxidized form is the colored one. 1964J. W. Linnett Electronic Struct. Molecules vii. 109 The viologens..can be formed by reducing γγ′-dipyridyl, or its derivatives, with zinc dust. 1980Nature 27 Nov. 321/1 Methyl viologen (paraquat)..acts as electron carrier. 1984New Scientist 17 May 23/1 New electrochromic displays (ECDs) based on viologens—close relatives of..paraquat that turn purple when electrochemically reduced—look set for commercialisation. |