Diphenylcyanoarsine

Names
Preferred IUPAC name Diphenylarsinous cyanide
Systematic IUPAC name Diphenylarsanecarbonitrile
Other names Clark 2 Diphenylarsinecarbonitrile Diphenylarsine cyanide Di(phenyl)arsanylformonitrile Diphenylcyanoarsine
Identifiers
CAS Number	23525-22-6 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	58070 Y
ECHA InfoCard	100.041.545
EC Number	245-716-6
MeSH	Clark+2
PubChem CID	64506
CompTox Dashboard (EPA)	DTXSID0075316
InChI InChI=1S/C13H10AsN/c15-11-14(12-7-3-1-4-8-12)13-9-5-2-6-10-13/h1-10H Y Key: BDHNJKLLVSRGDK-UHFFFAOYSA-N Y InChI=1/C13H10AsN/c15-11-14(12-7-3-1-4-8-12)13-9-5-2-6-10-13/h1-10H
SMILES C1=CC=C(C=C1)[As](C#N)C2=CC=CC=C2 N#C[As](C1=CC=CC=C1)C1=CC=CC=C1
Properties
Chemical formula	C13H10AsN
Molar mass	255.002920742 g mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Diphenylcyanoarsine, also called CLARK 2 (Cyanide-Arsenic Kampfstoff) by the Germans, was discovered in 1918 by Sturniolo and Bellinzoni^[1] and shortly thereafter used like the related Clark 1 gas by the Germans for chemical warfare in the First World War. The substance forms colourless, garlic-smelling crystals and causes nausea, vomiting and headaches. It can subsequently lead to e.g. pulmonary oedema (fluid on the lungs).

See also

• Clark 1
• Clark 3
• Chemical weapons

References