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K[B 6 PO 10 (OH) 4 ] was prepared under mild hydrothermal conditions (T = 170 °C) from a concentrated solution of K 2 B 4 O  7  ∙ 4H 2 O , KH 2 PO 4 , and HCl (18%). The crystal structure of the tetragonal compound was solved by X-ray single crystal methods (space group P 4/ncc, No 130): a = 1209.66(13), c = 759.05(7) pm; Z = 4. The anionic partial structure consists of infinite rods of  ∞  1 [B 6 PO 10 (OH)4] −  which are built of vierer-rings of alternating BO 4  and PO 4  tetrahedra with additional open-loop branchings via planar B 2 O 3 (OH ) 2  groups at the BO 4  units by sharing common oxygen functions. Potassium (K + ) is located within structural channels running along [001]; the eightfold coordination by oxygen (OH-groups) results in a (slightly) distorted tetragonal antiprism.

zeitschrift für naturforschung b

K[B 6 PO 10 (OH) 4 ]: Ein Borophosphat mit gestreckten Bändern aus Tetraeder-Vierer-Ringen und offen-zyklischen Verzweigungen über planare B 2 O 3 (OH) 2 -Gruppen / K[B 6 PO 10 (OH) 4 ]: A Borophosphate Containing Rods of Tetrahedral Vierer-Rings with Additional Open-Loop Branchings via Planar B 2 O 3 (OH) 2  Groups