Mercury(II) thiocyanate

Mercury(II) thiocyanate
Names
	Other names Mercuric thiocyanate; Mercuric sulfocyanate
Identifiers
CAS Number	592-85-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.008.886
EC Number	209-773-0;
PubChem CID	11615;
UNII	3JNH1DM7IF ;
CompTox Dashboard (EPA)	DTXSID7060469 ;
	InChI InChI=1S/2CHNS.Hg/c22-1-3;/h23H;/q;;+2/p-2 Key: GBZANUMDJPCQHY-UHFFFAOYSA-L;
	SMILES C(#N)[S-].C(#N)[S-].[Hg+2];
Properties
Chemical formula	Hg(SCN)2
Molar mass	316.755 g/mol
Appearance	White monoclinic powder
Odor	odorless
Density	3.71 g/cm3, solid
Melting point	165 °C (329 °F; 438 K) (decomposes)
Solubility in water	0.069 g/100 mL
Solubility	Soluble in dilute hydrochloric acid, KCN, ammonia ; slightly soluble in alcohol, ether
Magnetic susceptibility (χ)	−96.5·10−6 cm3/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H330, H373, H410
Precautionary statements	P260, P262, P270, P271, P273, P280, P284, P301+P316, P302+P352, P304+P340, P316, P319, P320, P321, P330, P361, P364, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 1 1
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	46 mg/kg (rat, oral)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Mercury(II) thiocyanate (Hg(SCN)₂) is an inorganic chemical compound, the coordination complex of Hg²⁺ and the thiocyanate anion. It is a white powder. It will produce a large, winding "snake" when ignited, an effect known as the Pharaoh's serpent.^[2]

Synthesis and structure

The first synthesis of mercury thiocyanate was probably completed in 1821 by Jöns Jacob Berzelius:

HgO + 2 HSCN → Hg(SCN)₂ + H₂O

Evidence for the first pure sample was presented in 1866 prepared by a chemist named Otto Hermes.^[2] It is prepared by treating solutions containing mercury(II) and thiocyanate ions. The low solubility product of mercury thiocyanate causes it to precipitate from the solution.^[3] Most syntheses are achieved by precipitation:

Hg(NO₃)₂ + 2 KSCN → Hg(SCN)₂ + 2KNO₃

The compound adopts a polymeric structure with Hg²⁺ centres linearly coordinated to two S atoms with a distance of 2.381 Å. Four weak Hg²⁺--N interactions are indicated with distances of 2.81 Å.^[4]

Uses

Mercury thiocyanate has a few uses in chemical synthesis. It is the precursor to other thiocyanate complexes such as potassium tris(thiocyanato)mercurate(II) (K[Hg(SCN)₃]) and caesium tris(thiocyanato)mercurate(II) (Cs[Hg(SCN)₃]). The Hg(SCN)₃⁻ ion can also exist independently and is easily generated from the compounds above, amongst others.^[5]

Its reactions with organic halides yield two products, one with the sulfur bound to the organic compound and one with the nitrogen bound to the organic compound.^[6]

Use in chloride analysis

It was discovered that mercury thiocyanate can improve detection limits in the determination of chloride ions in water by UV-visible spectroscopy. This technique was first suggested in 1952 and has been a standard method for the determination of chloride ions in laboratories worldwide ever since. An automated system was invented in 1964 and then a commercial colour analyzer was made available in 1974 by Technicon (Tarrytown, NY, USA). The basic mechanism involves the addition of mercury thiocyanate to a solution with an unknown concentration of chloride ions and iron as a reagent. The chloride ions cause the mercury thiocyanate salt to dissociate and the thiocyanate ion to bind Fe(III), which absorbs intensely at 450 nm. This absorption allows for the measurement of the concentration of the iron complex. This value allows one to calculate the concentration of chloride.^[7]

It can determine the concentration of chloride ions in an aqueous solution. Mercury thiocyanate without iron (III) is added to a solution with an unknown concentration of chloride ions, forming a complex of the mercury thiocyanate and chloride ion that absorbs light at a 254 nm, allowing more accurate measurements of attention than the aforementioned technique using the iron.^[7]

Pharaoh's serpent

Mercury thiocyanate was formerly used in pyrotechnics causing an effect known as the Pharaoh's serpent or Pharaoh's snake. When the compound is in the presence of a strong enough heat source, a rapid, exothermic reaction that produces a large mass of coiling, serpent-like solid is started. An inconspicuous flame, which is often blue but can also be yellow/orange, accompanies the combustion. The resulting solid can range from dark graphite gray to light tan in colour with the inside generally much darker than the outside.^[2]

The reaction has several stages as follows:^[8] Igniting mercury thiocyanate causes it to form an insoluble brown mass that is primarily carbon nitride, C₃N₄. Mercury sulfide and carbon disulfide are also produced.

References

^ "Mercuric thiocyanate (Compound)". pubchem.ncbi.nlm.nih.gov. Retrieved 31 May 2023.
^ ^a ^b ^c Davis, T. L. (1940). "Pyrotechnic Snakes". Journal of Chemical Education. 17 (6): 268–270. doi:10.1021/ed017p268.
^ Sekine, T.; Ishii, T. (1970). "Studies of the Liquid-Liquid Partition systems. VIII. The Solvent Extraction of Mercury (II) Chloride, Bromide, Iodide and Thiocyanate with Some Organic Solvents". Bulletin of the Chemical Society of Japan. 43 (8): 2422–2429. doi:10.1246/bcsj.43.2422.
^ Beauchamp, A.L.; Goutier, D. "Structure cristalline et moleculaire du thiocyanate mercuric" Canadian Journal of Chemistry 1972, volume 50, p977-p981. doi:10.1139/v72-153
^ Bowmaker, G. A.; Churakov, A. V.; Harris, R. K.; Howard, J. A. K.; Apperley, D. C. (1998). "Solid-State ¹⁹⁹Hg MAS NMR Studies of Mercury(II) Thiocyanate Complexes and Related Compounds. Crystal Structure of Hg(SeCN)₂". Inorganic Chemistry. 37 (8): 1734–1743. doi:10.1021/ic9700112.
^ Kitamura, T.; Kobayashi, S.; Taniguchi, H. (1990). "Photolysis of Vinyl Halides. Reaction of Photogenerated Vinyl Cations with Cyanate and Thiocyanate Ions". Journal of Organic Chemistry. 55 (6): 1801–1805. doi:10.1021/jo00293a025.
^ ^a ^b Cirello-Egamino, J.; Brindle, I. D. (1995). "Determination of chloride ions by reaction with mercury thiocyanate in the absence of iron(III) using a UV-photometric, flow injection method". Analyst. 120 (1): 183–186. doi:10.1039/AN9952000183.
^ "Make a Pharaoh's Snake Firework". About.com Education. Archived from the original on 2012-02-01. Retrieved 2016-02-08.