byproducts: HBr; H{AuBr4} melting and the product heating at 115°C;

3 h at 100°C, 12 h at 105°C;

poly(vinylpyrrolidone); silver nitrate in ethylene glycol byproducts: AgBr; Irradiation (UV/VIS); 0.0023 M soln. of HAuBr4 containing 0.010 M poly(vinylpyrrolidone) and 3.50E-4 M AgNO3 (Au/Ag = 6.81) irradiated with LPI-250 xenon lamp (50 W) using 250-400 nm filter;

in water

3 h at 100°C, 12 h at 105°C;