16774-21-3 Usage
Chemical Properties
yellow-orange crystals
Physical properties
Reddish-orange monoclinic crystals; very soluble in water.
Uses
Different sources of media describe the Uses of 16774-21-3 differently. You can refer to the following data:
1. Ceric ammonium nitrate is used as a volumetric oxidizing reagent in many oxidation-reduction titrations. Cerium(IV) ion is a strong oxidant similar to permanganate ion. It is the most widely-used primary standard among all Ce(IV) compounds. Other applications of this compound are in organic oxidation reactions; and as a catalyst in polymerization of olefins.
2. Used as oxidimetric standard.
3. A strongly oxidizing cerium preparation
Preparation
Ceric ammonium nitrate is prepared by electrolytic oxidation of cerous nitrate in nitric acid to ceric nitrate, followed by the addition of ammonium nitrate solution. It is separated from the solution by crystallization. It may be prepared alternatively by dissolving cerium(II) oxide, CeO?H2O in concentrated nitric acid followed by treatment with ammonium nitrate.
Reactions
The most important reactions of Ceric ammonium nitrate are the oxidations, attributed to Ce4+ ion in the solution. The standard reduction potential E° for the formal half-reaction: Ce4+ + e– Ce3+ in 1 M H2SO4 is 1.44 V. The oxidizing strength is comparable to permanganate (MnO4- ), bromate (BrO3-), and dichromate (Cr2O72-) anions. Analytical applications involve reactions with reductants such as sodium oxalate (Na2C2O4) or arsenic (III) oxide (As2O3) in the presence of iron, with ferroin (1,10–phenanthroline iron(II) complex) as the indicator.
General Description
Ammonium cerium(IV) nitrate (Cerium(IV) ammonium nitrate, CAN) is a versatile reagent for oxidative electron transfer reactions. It participates in various novel carbon-carbon bond-forming reactions involved in one-pot synthesis of dihydrofurans, tetrahydrofurans and aminotetralins. Iodine/ammonium cerium(IV) nitrate has been employed in direct α-iodination of various ketones to afford the corresponding α-iodo ketones. CAN has been reported as an powerful one-electron oxidant. It also participates in various carbon-heteroatom bond-forming reactions.
Hazard
Ceric ammonium nitrate is a powerful oxidizing agent. Precautions should be taken to avoid accidental contacts with orgnaic or other readily oxidizable substances.
Flammability and Explosibility
Notclassified
Purification Methods
Ceric ammonium nitrate (125g) is warmed with 100mL of dilute HNO3 (1:3 v/v) and 40g of NH4NO3 until it dissolves, and filtered through a sintered-glass funnel. The solid which separates on cooling in ice is filtered off on a sintered funnel (at the pump) and air is sucked through the solid for 1-2 hours to remove most of the nitric acid. Finally, the solid is dried at 80-85o.
Check Digit Verification of cas no
The CAS Registry Mumber 16774-21-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,7,7 and 4 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 16774-21:
(7*1)+(6*6)+(5*7)+(4*7)+(3*4)+(2*2)+(1*1)=123
123 % 10 = 3
So 16774-21-3 is a valid CAS Registry Number.
InChI:InChI=1/Ce.NO3.H3N/c;2-1(3)4;/h;;1H3/q+4;-1;/p+1
16774-21-3Relevant articles and documents
Electrokinetic properties and stability of cerium dioxide suspensions
Barany,Bohacs,Chepurna,Meszaros
, p. 69343 - 69351 (2016/08/05)
The dispersed ceria particles synthesized by destruction (heating) of the double salts of cerium and ammonium nitrate have been determined to be porous. The surface charge density and electrokinetic potential of the particles have been measured by potentiometric titration and micro-electrophoresis. The point of zero charge (pzc) corresponds to pH 5.6 in water and pH 5.2 in 0.001 M KCl solution, whereas the isoelectric point remains around pH 5.8 for both solutions. Constant (negative) values of the ζ-potential in 0.001-0.01 M KCl solutions have been measured; however, at higher salt concentrations, a gradual decrease of the ceria electrokinetic potential has been observed. Addition of CaCl2 and AlCl3 or LaCl3 obtains a considerable decrease in the ζ-potential of the particles and changes the sign correspondingly. After ultrasonic treatment of the suspension, a monomodal particle size distribution with an average particle size of 0.6 μm was measured. Moreover, the laws of aggregation of CeO2 particles as a function of aging, pH, shear conditions and the concentration of added KCl and CaCl2 solutions have been studied. The obtained results can be explained from the viewpoint that micron-sized strongly hydrated CeO2 particles have a tendency to aggregate over the time under applying shear force or in the presence of electrolytes in a secondary minimum with the formation of loose, easily destroyable and renewable aggregates.
