14337-14-5

Basic information

• Product Name: Aurate(1-),tetrabromo-, (SP-4-1)- (9CI)
• Synonyms: Aurate(1-),tetrabromo- (8CI); Bromoaurate(III); Tetrabromoaurate(1-);Tetrabromoaurate(III)
• CAS NO: 14337-14-5
• Molecular Formula: AuBr4
• Molecular Weight: 516.582
• Mol File: 14337-14-5.mol

Chemical Properties

• CAS DataBase Reference: Aurate(1-),tetrabromo-, (SP-4-1)- (9CI)(CAS DataBase Reference)
• NIST Chemistry Reference: Aurate(1-),tetrabromo-, (SP-4-1)- (9CI)(14337-14-5)
• EPA Substance Registry System: Aurate(1-),tetrabromo-, (SP-4-1)- (9CI)(14337-14-5)

Safety Data

• Hazardous Substances Data: 14337-14-5(Hazardous Substances Data)

Upstream product

• 7647-15-6 sodium bromide 
• 75-09-2 dichloromethane 

Downstream Products

• 957-75-5 5-bromouridine 
• 10097-32-2 bromide 
• 51-20-7 5-bromouracil 

Relevant articles and documents

Photooxidation of AuCl2- and AuBr2- induced by ds excitation

In the presence of electron acceptors such as CH2Cl2 or O2, the irradiation of AuCl2- or AuBr2- in acetonitrile led to the photooxidation of Au(I) to Au(III). AuCl4- and AuBr4- were formed as final products when additional halide was present. The reactive excited states were of the metal-centered ds type. The photooxidations were reversed in solutions of ethanol. AuCl4- and AuBr4- underwent a photoreduction to AuCl2- and AuBr2-, respectively.

Kinetics and Mechanism of the Reaction between Tetrachloro- and Tetrabromo-aurate(III) and Thiocyanate

The kinetics and mechanism for the overall reaction (i) (X=Cl or Br) have been studied at 25.0 deg C using stopped-flow spectrophotometry. 3- + 7SCN- + 4H2O -> 3- + HSO4- + HCN + 12X- + 6H+ (i) The reaction takes place in two kinetically well separated steps.The initial, rapid process can be identified as stepwise ligand substitutions (ii) (n=0-3) which take place via direct ligand displacements, the solvent path being negligible. 4-n(SCN)n>- + SCN-3-n(SCN)n+1>- + X- (ii) The substitution kinetics give no evidence for formation of persistent five-co-ordinate intermediates.The subsequent slower reaction is due to reduction of gold(III) to gold(I) thiocyanato-species.The rate of this step varies by four orders of magnitude within the accessible concentration interval of gold (1E-6-1E-2 mol dm-3).At high gold concentrations the reduction is slow and follows no simple-order kinetics due to inhibition by the cyanide formed as a product.This inhibition is eliminated for gold concentrations less than 5E-6 mol dm-3, where the redox reaction is rapid and strictly first order with respect to the concentrations of thiocyanate and gold complex.The mechanism for the reductive elimination is intermolecular involving a reaction between the gold(III) complex and an outer-sphere thiocyanate.Rate constants for reduction of - and - by thiocyanate at 25 deg C are (5+/-2)E4 and (2.4+/-0.2)E3 dm3 mol-1 s-1 respectively, for a 1.00 mol dm-3 perchlorate medium.