Abstract
Abstract The novel potassium nickel borate nitrate K7Ni[B18O24(OH)9](NO3)6 ·(H3BO3) 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 R3̅ (no. 148) with the lattice parameters a = 1222.29(8) and c = 5478.4(4) pm. Generally, K7Ni[B18O24(OH)9](NO3)6 ·(H3BO3) is comprised of nitrate layers and complex nickel borate layers surrounded by boric acid, nitrate anions, and potassium cations.
Highlights
Borates incorporating cations from the transition metal group have long been of interest in our working group
The novel potassium nickel borate nitrate K7Ni[B18O24(OH)9](NO3)6 · (H3BO3) 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
K7Ni[B18O24(OH)9] (NO3)6 · (H3BO3) is comprised of nitrate layers and complex nickel borate layers surrounded by boric acid, nitrate anions, and potassium cations
Summary
Borates incorporating cations from the transition metal group have long been of interest in our working group This is especially true for high-pressure/high-temperature conditions as shown by several publications in the last decade. The synthesis conditions could thereby be shifted from high-pressure/high-temperature conditions to ambient pressure in simple stainless-steel autoclaves and glass ampoules. Similar to these syntheses, our group has prepared several new compounds containing borate and nitrate groups like K3Na[B6O9(OH)3]NO3 [12], Na3−xKx[B6O10]NO3 [13], Lu2B2O5(NO3)2 · 2H2O [14], and RE[B5O8(OH)(H2O)x] NO3 · 2H2O [RE = Pr (x = 0.87), Nd (x = 0.85), Sm (x = 0)] [15, 16]. As the title compound could only be synthesized as a side phase, the characterization in this work is only focused on a X-ray single-crystal structure determination
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