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Single crystals of AgSr[B 7 O 12 ] were obtained by using a B20 3 flux-technique and Ag 2 CO 3  and SrCO 3  as starting materials in a silver ampoule at 800 °C. X-ray investigations on single crystals led to the space group C 2/c with a = 664.2(5); b = 1153.6(3); c = 2198.0(6) pm; β = 92,52(3)°; Z = 8. Ag +  is fourfold coordinated by oxygen atoms and forms distorted AgO 4  tetrahedra while Sr 2+  has nine nearest neighbours. The compound contains a hitherto unknown two dimensional borate anion [B 7 O 12 ] 3- which contains four trigonal planar BO 3  groups and three BO 4  tetrahedra per unit.

zeitschrift für naturforschung b

AgSr[B 7 O 12 ]: Das erste wasserfreie quaternäre Silber(I)-Borat mit vierfach koordiniertem Silberion und einem neuartigen Boratanion/ AgSr[B 7 O 12 ]: The First Anhydrous Quaternary Silver(I)-Borate with Fourfold Coordinated Silver Ion and a New