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Single crystals of Ag 2 Cs[B 15 O 24 ] were prepared by using a B 2 O 3  flux technique with Ag 2 CO 3  and Cs 2 CO 3  in a closed silver tube at 650 °C. X-Ray investigations led to a new crystal structure in the space group P 2 1 2 1 2 (Nr. 18) with lattice parameters a = 1778.7 (4); b = 2219.2 (4); c = 512.2 (1) pm, Z = 4. The silver atoms are part of distorted AgO 4  tetrahedra and planar AgO 3  units while the caesium atoms are eightfold coordinated by oxygen. The compound contains an as yet unknown borate anion [B 15 O 24 ] with twelve BO 3-  and three BO 4  units per formula. The BO 3  units are connected to eight cords twisted to helices which are combined via BO 4  tetrahedra to a three dimensional framework with large tunnels occupied by the cations.

zeitschrift für naturforschung b

Ag 2 Cs[B 15 O 24 ]: Ein wasserfreies quaternäres Silber(I)-Borat mit einem neuartigen Boratanion mit helixartigem Aufbau / Ag 2 Cs[B 15 O 24 ]: An Anhydrous Quaternary Silver(I)-Borate with a New Helical Borate Anion