Carbazide

In chemistry, a carbazide is a functional group with the general formula RNH-NH(C=O)NH-NHR. They can be derived from the condensation of carbonic acid with a hydrazine. Carbohydrazide is the simplest carbazide, with another common carbazide being diphenylcarbazide, which is used as an analytical reagent.[1]

Carbohydrazide, the simplest carbazide
Diphenylcarbazide

Diphenylcarbazide forms an intense blue color with chromium in the hexavalent state. It has an absorptivity coefficient about 3400. That means very small amounts of chromium can be detected; 25 micrograms in 25 mL of solution are too dark to read on a spectral device, so concentrations well below that can be detected.

Thiocarbazide

The sulfur analog is called a thiocarbazide, of which thiocarbohydrazide is the simplest example.

Carbazone and thiocarbazone

A carbazone is a partially oxidized carbazide with the general formula R=NNH(C=O)NH-NHR. The sulfur analog is called a thiocarbazone, of which dithizone is an example.

gollark: Firecubez, do you like generic generics?
gollark: This all sounds horrifying.
gollark: Instead of just making a function generic over a normal type parameter or mutability or lifetime or purpleness or whatever, you can generically make a function which takes a generic parameter of whatever type of generic the callsite wants.
gollark: You can make functions which are *generic over what they're generic over*.
gollark: Macron has extremely advanced generics.

See also

References
  1. Crossley, H. E. (1936). "Diphenylcarbazide. An internal indicator for use in the titration of iron with dichromate". The Analyst. 61 (720): 164. Bibcode:1936Ana....61..164C. doi:10.1039/AN9366100164.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.