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The novel potassium nickel borate nitrate K 7 Ni[B 18 O 24 (OH) 9 ](NO 3 ) 6  ·(H 3 BO 3 ) was obtained from a simple hydrothermal synthesis in a stainless-steel autoclave at  T  = 513 K starting with nickel dichloride hexahydrate, and boric and nitric acid with the pH adjusted to 8 by KOH. Single-crystal X-ray diffraction data provided the basis for the structure analysis and refinement. The compound crystallizes in the trigonal space group  R 3̅ (no. 148) with the lattice parameters  a  = 1222.29(8) and  c  = 5478.4(4) pm. Generally, K 7 Ni[B 18 O 24 (OH) 9 ](NO 3 ) 6  ·(H 3 BO 3 ) is comprised of nitrate layers and complex nickel borate layers surrounded by boric acid, nitrate anions, and potassium cations.

Synthesis of the first nickel borate nitrate K 7 Ni[B 18 O 24 (OH) 9 ](NO 3 ) 6 · (H 3 BO 3 )