rubeanicadj.
/ˌruːbᵻˈanɪk/, U.S. /ˌrubiˈænɪk/ Chemistry.
rubeanic acid n. an orange-red crystalline solid formed by reaction of cyanogen and hydrogen sulphide, and used in analysis as a reagent to detect copper.Systematic name: dithiooxamide; (CS(NH2))2.
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the world > matter > chemistry > chemical tests > [noun] > reagents > other
Millon's reagent1872
orcinol1880
rubeanic acid1891
tetrazolium1895
Schiff reagent1897
Tollens'(s) reagent1904
1884 Jrnl. Chem. Soc. 46 1109 (heading) The so-called rubeanhydric acid (cyanogen bisulphydrate).]
1891 Jrnl. Chem. Soc. 60 ii. 1008 The following experiments show that the red compound (‘rubeanic acid, rubeanwasserstoff’) obtained by the combination of cyanogen and hydrogen sulphide behaves in many reactions as if it were dithioxamide, NH2·CS·CS·NH2.
1928 Q. Jrnl. Indian Chem. Soc. 3 118 Rubeanic acid may be regarded as a tautomeric compound consisting of an equilibrium mixture of sym.-dithio-oxamide and sym.-di-imido-dithio-oxalic acid.
1967 New Scientist 2 Feb. 272/3 A test plate subjected to 500 hours accelerated weathering while protected with a polyurethane resin containing rubeanic acid shows no sign of tarnishing.
2005 J. A. Centeno et al. in O. Selinus et al. Essent. Med. Geol. xxx. 728/1 Rubeanic acid reacts with copper to form a dark precipitate consisting of copper rubeanate.
This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).
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adj.1891