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Mercury(II) thiocyanate (Hg(SCN) 2) is an inorganic chemical compound, the coordination complex of Hg 2+ and the thiocyanate anion. It is a white powder. It is a white powder. It will produce a large, winding "snake" when ignited, an effect known as the Pharaoh's serpent .
This must be done in a fume hood because all mercury compounds are hazardous. After igniting the reagents, mercury(II) thiocyanate breaks down to form mercury(II) sulfide (HgS), carbon disulfide (CS 2), and carbon nitride (C 3 N 4). Graphitic carbon nitride, a pale yellow solid, is the main component of the ash. [1]
Common salts include the colourless salts potassium thiocyanate and sodium thiocyanate. Mercury(II) thiocyanate was formerly used in pyrotechnics. Thiocyanate is analogous to the cyanate ion, [OCN] −, wherein oxygen is replaced by sulfur. [SCN] − is one of the pseudohalides, due to the similarity of its reactions to that of halide ions.
Fulminates were discovered by Edward Charles Howard in 1800. [1] [2] [3] The use of fulminates for firearms was first demonstrated by a Scottish minister, Alexander John Forsyth, who patented his scent-bottle lock in 1807; this was a small container filled with fulminate of mercury.
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2 ion, found in mercury(I) (mercurous) compounds. The existence of the metal–metal bond in Hg(I) compounds was established using X-ray studies in 1927 [ 2 ] [ page needed ] and Raman spectroscopy in 1934 [ 3 ] making it one of the earliest, if not the first, metal–metal covalent bonds to be characterised.