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About: Pseudo-oxocarbon anion     Goto   Sponge   NotDistinct   Permalink

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In chemistry, the term pseudo-oxocarbon anion is used to refer to a negative ion that is conceptually derived from an oxocarbon anion through replacement of one or more of the basic oxygen atoms by chemically similar elements or functional groups, such as sulfur (S), selenium (Se), or (=C(CN)2). Typical examples are the anions 2-(Dicyanomethylene)croconate, croconate violet, and croconate blue, derived from the croconate anion C5O2−5 by replacing one, two, or three oxygen atoms by dicyanomethylene groups: