K4Au8Ga: a filling variant of the MgCu2 type

Black, brittle single crystals of K4Au8Ga were obtained as the main product of the reaction of potassium azide with gold sponge and gallium at T = 770 g. he structure of the compound (space group C2/m, Z = 4, a = 20.850(4) An gstrom, b = 5.630(1) Angstrom, c = 10.912(2) Angstrom, beta = 97.45(2)degre es) was determined from X-ray single-crystal diffractometry data. K4Au8Ga c rystallizes in a filling variant of the MgCu2 type. The gold atoms form a ( 3)(infinity)[Au-4/2]-framework. One quarter of the tetrahedra is filled by gallium. The potassium atoms are placed in channel-like cavities of the Au- Ga partial structure.