Thallium thiocyanate

Structural formula
General
Surname	Thallium thiocyanate
other names	Thallium (I) thiocyanate Thallium rhodanide
Molecular formula	TlSCN
Brief description	white solid
External identifiers / databases
CAS number 3535-84-0 EC number 222-571-7 ECHA InfoCard 100.020.520 PubChem 3082002 Wikidata Q4457912
properties
Molar mass	262.46 g mol −1
Physical state	firmly
density	4.956 g cm −3
Melting point	230 ° C
solubility	slightly soluble in water
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 300-312-330-373-411 P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Thallium thiocyanate is an inorganic chemical compound of thallium from the group of thiocyanates .

Extraction and presentation

Thallium thiocyanate can be obtained by reacting thallium (I) nitrate with potassium thiocyanate .

${\displaystyle \mathrm {TlNO_{3}+KSCN\longrightarrow TlSCN\downarrow +KNO_{3}} }$

It can also be obtained by reacting ammonium thiocyanate solutions with thallium hydroxide solutions.

properties

Thallium thiocyanate is a crystalline white solid. It has an orthorhombic crystal structure with the space group Pbcm (space group no. 57) . Above 90 ° C it changes into a tetragonal crystal structure with the space group I 4 / mcm (space group no. 140) .

Individual evidence

1. ↑ ^{a b c d} Entry on thallium thiocyanate in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
2. ↑ Data sheet Thallium (I) thiocyanate, 98% from AlfaAesar, accessed on July 1, 2016 ( PDF )(JavaScript required) .
3. ^ ^{A b} Robert Lippman, Reuben Rudman: Dynamic twinning: Polymorphism of thallium thiocyanate studied with x-ray diffraction. In: The Journal of Chemical Physics. 79, 1983, p. 3457, doi : 10.1063 / 1.446195 .
4. ^ Ronald Rich: Inorganic Reactions in Water . Springer, 2007, ISBN 978-3-540-73962-3 , pp. 320 ( limited preview in Google Book search).
5. ↑ Entry on thallium thiocyanate 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 .
6. ↑ Yoshihiro Furukawa, Daiyu Nakamura: Thallium Nuclear Magnetic Relaxation in Solid Thallium (I) Thiocyanate TlSCN: Phase Transition and Ionic Motion. In: Zeitschrift für Naturforschung A. 45, 1990, doi : 10.1515 / zna-1990-9-1022 .