noun
Usage: usually capitalized R
Etymology: after A. Reinecke, 19th century German chemist
: a red crystalline coordination complex NH 4 [Cr(NH 3 ) 2 (SCN) 4 ].H 2 O that is formed by adding ammonium dichromate to hot ammonium thiocyanate and that with heavy-metal ions and with organic bases, alkaloids, and basic antibiotics gives precipitates useful in separations and characterizations