| 释义 |
rubeanic acid Chem.|ˈruːbɪænɪk ˈæsɪd|
[tr. G. rubeanwasserstoffsäure, f. L. rube-us red + G. -an (as in cyanwasserstoffsäure hydrocyanic acid) + wasserstoff hydrogen + säure acid.]
Dithio-oxamide, [CS(NH2)]2, an orange-red crystalline solid formed by reaction of cyanogen and hydrogen sulphide, and employed in analysis as a reagent to detect copper.
[1884Jrnl. Chem. Soc. XLVI. 1109 (heading) The so-called rubeanhydric acid (cyanogen bisulphydrate).] 1891Ibid. LX. 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 dithi⁓oxamide, NH2·CS·CS·NH2. 1928Q. Jrnl. Indian Chem. Soc. III. 118 Rubeanic acid may be regarded as a tantomeric compound consisting of an equilibrium mixture of sym.-dithio-oxamide and sym.-di-imido-dithio-oxalic acid. 1967New 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. 1981Sci. Amer. Feb. 127/1 For a more sensitive test [for copper in silver coins] Epstein suggests using a saturated solution of rubeanic acid (dithiooxamide) in alcohol and a 20 percent solution of malonic acid. |