Diphenyl carbazide

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Structural formula
Structural formula of diphenyl carbazide
General
Surname Diphenyl carbazide
other names
  • 1,5-diphenylcarbohydrazide
  • sym -diphenyl carbazide
  • DPC
Molecular formula C 13 H 14 N 4 O
Brief description

almost white odorless photosensitive solid

External identifiers / databases
CAS number 140-22-7
EC number 205-403-7
ECHA InfoCard 100.004.913
PubChem 8789
ChemSpider 8459
Wikidata Q1227137
properties
Molar mass 242.28 g mol −1
Physical state

firmly

Melting point

170-175 ° C

solubility
  • poorly soluble in water
  • soluble in acetone, hot ethanol and acetic acid
safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Diphenyl carbazide ( DPC ) is a chemical compound from the group of carbazides . It has a similar structural formula to diphenylcarbazone and can easily be converted into it by oxidation .

properties

Diphenyl carbazide is a white solid that is sparingly soluble in water, but readily soluble in organic solvents. It forms colored complex compounds with certain metal ions .

use

Diphenyl carbazide is used as a redox indicator and for the photometric determination of chromium (VI) compounds such as chromates or dichromates . This creates diphenylcarbazone , which forms a red-violet complex with the chromium compounds. Chromium (III) compounds can also be determined using this method, whereby these first have to be oxidized to chromium (VI) with an oxidizing agent (e.g. ammonium persulfate solution ).

literature

  • Merck: ChemDAT: The Merck Chemistry Database, CD edition 2002
  • Lange / Zdenĕk: Photometric Analysis, Verlag Chemie Weinheim 1980, pp. 88 ff, ISBN 3-527-25853-1

Individual evidence

  1. ↑ a b c data sheet 1,5-diphenylcarbazide (PDF) from Merck , accessed on May 16, 2011.
  2. ↑ a b c data sheet 1,5-diphenylcarbazide from Sigma-Aldrich , accessed on May 22, 2017 ( PDF ).
  3. ↑ Entry on 1,5-diphenylcarbonohydrazide at TCI Europe, accessed on June 27, 2011.