Diphenylcyanoarsine

Diphenylcyanoarsine, also called Clark 2 (Chlor-Arsen-Kampfstoff 2, being the successor of Clark 1) 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 causes nausea, vomiting and headaches. It can subsequently lead to e.g. pulmonary edema (fluid in the lungs).

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
UNII	SF5K94TPOF Y
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