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Crystals of K 6 Cu 2 [B 4 PhO 28 (OH) 6 ] were grown under hydrothermal conditions at 160 °C. The crystal structure (monochnic, P2 1 /c (Nr. 14), a = 961.8(1), b = 1755.0(1), c = 942.0(1) pm, β = 112.29(1)°, Z = 2) contains oligomeric tetrahedral anions based on six-membered rings {B 4 P 2 O 10 O 8/2 } with additional branchings by hydrogenphosphate-groups (open branching: 4 x HPO 3 O 1/2 ; cyclic branching: 2 x HPO 2 O 2/2 ). The complex borophosphate anion is represented by the formula [B 4 P 8 O 28 (OH) 6 ] 10- . Cu 2+  is in a tetragonal pyramidal and K +  in an irregular coordination by eight and nine oxygen ligands, respectively.

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Oligomere Tetraeder-Anionen in Borophosphaten: Sechserringe mit offenen und cyclischen Phosphat-Verzweigungen in der Kristallstruktur von K 6 Cu 2 [B 4 P 8 O 28 (OH) 6 ] / Oligomeric Tetrahedral Anions in Borophosphates: Six-Membered Rings with Open and Cyclic Phosphate Branchings in the Crystal Structure of K 6 Cu 2 [B 4 P 8 O 28 (OH) 6 ]