Nickel (II) thiocyanate

Structural formula
General
Surname	Nickel (II) thiocyanate
other names	Nickel thiocyanate Nickel dithiocyanate Nickel rhodanide
Molecular formula	Ni (SCN) 2
Brief description	yellow solid
External identifiers / databases
CAS number 13689-92-4 EC number 237-205-1 ECHA InfoCard 100.033.808 PubChem 5145251 ChemSpider 4318849 Wikidata Q4457911
properties
Molar mass	174.84 g mol −1
Physical state	firmly
Melting point	240 ° C (decomposition)
solubility	very easily soluble in water (350–1393 g · l −1 at 21 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 317-334-341-350-360-372-410 EUH: 032 P: 301 + 330 + 331-303 + 361 + 353-304 + 340-310-285-304 + 341-342 + 311-261-272-280-302 + 352-333 + 313-321-363-201-202-281-308 + 313-405-260
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nickel (II) thiocyanate is an inorganic chemical compound of nickel from the group of thiocyanates .

Extraction and presentation

Nickel (II) thiocyanate can be obtained by reacting a solution of nickel (II) chloride or nickel (II) nitrate in acetic acid with ammonium thiocyanate .

It is also possible to display it by reacting nickel (II) hydroxide or nickel (II) carbonate with a dilute thiocyanic acid solution . Large green crystals of tetrahydrate separate on evaporation. Above 15 ° C and when the tetrahydrate is dried, the hemihydrate forms as a yellow powder, which becomes anhydrous when heated to 150 ° C and turns dark chocolate brown.

The easiest way to obtain it is to double the reaction of nickel (II) sulfate with barium thiocyanate :

${\displaystyle \mathrm {NiSO_{4}+Ba(SCN)_{2}\longrightarrow Ni(SCN)_{2}+BaSO4\downarrow } }$

properties

Nickel (II) thiocyanate is a hemihydrate yellow to green odorless solid that is very easily soluble in water. It forms complex compounds with pyridines and other compounds . The dark chocolate brown anhydrate first turns yellow when water is added, then it goes into solution with a green color.

Individual evidence

1. ↑ ^{a b c d} Kali P. Sarma, Raj K. Poddar: A convenient method of preparing nickel (II) thiocyanate and its use in synthesis. In: Transition Metal Chemistry. 9, 1984, p. 135, doi : 10.1007 / BF00935928 .
2. ↑ ^{a b} Entry on nickel dithiocyanate in the GESTIS substance database of the IFA , accessed on January 28, 2020(JavaScript required) .
3. ↑ Dale L. Perry: Handbook of Inorganic Compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , pp. 16 ( limited preview in Google Book search).
4. ↑ Entry on nickel dithiocyanate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
5. ↑ Safety data sheet for nickel thiocyanate. (PDF) Santa Cruz Biotechnology, Inc., December 7, 2017, accessed January 28, 2020 . 
6. ↑ ^{a b} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1702.
7. ^ KC Dash, SN Das: Complexes of Nickel (II) Thiocyanate with Anilines. In: Journal of Inorganic and General Chemistry. 400, 1973, p. 78, doi : 10.1002 / zaac.19734000111 .
8. ↑ László Erdey: Gravimetric Analysis International Series of Monographs on Analytical Chemistry . Elsevier, 2013, ISBN 978-1-4832-2267-7 , pp. 391 ( limited preview in Google Book search).