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- W2061551181 abstract "X-ray structure analyses of crystalline [NMe 4 ][B 5 O 6 (OH) 4 ] · nH 2 O with n ≈ 0.25-0.50 (1), [NEt 4 ][B 5 O 6 (OH) 4 ] (2), [NPhMe 3 ][B 5 O 6 (OH) 4 ] (3), and [pipH][B 5 O 6 (OH) 4 ] (4) reveal that these materials are novel clathrates with closely related three-dimensional host structures built up of hydrogen-bonded oligomeric pentaborate [B 5 O 6 (OH) 4 ] - ions. The organic cations and water molecules (in 1) occupy as guest species large straight channel-like voids of nearly rectangular cross-section. Compound 1 crystallizes monoclinically with space group P2,/c (Z = 4); the compounds 2,3 and 4, which possess the same host-structure topology, crystallize triclinically with space group P1̄ (Z = 2). 11 B-MAS NMR spectra allow the detection of small angular distortions in the pentaborate anions caused by the specific hydrogen bonding in the host frameworks. Upon heating the compounds on a thermobalance in a dynamic inert gas atmosphere dehydration occurs at temperatures of 563 K (1), 543 K (2), 558 K (3) and 523 K (4) before degradation of the organic cations starts at temperatures of 633 K (1), 623 K (2), 623 K (3) and 613 K (4)." @default.
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- W2061551181 date "1993-07-01" @default.
- W2061551181 modified "2023-10-06" @default.
- W2061551181 title "Clathrates with Three-Dimensional Host Structures of Hydrogen-Bonded Pentaborate [B<sub>5</sub>O<sub>6</sub>(OH)<sub>4</sub>]<sup>-</sup> Ions: Pentaborates with the Cations NMe<sub>4</sub> <sup>+</sup>, NEt<sub>4</sub> <sup>+</sup>, NPhMe<sub>3</sub> <sup>+</sup> and pipH<sup>+</sup> (pipH<sup>+</sup> = Piperidinium)" @default.
- W2061551181 doi "https://doi.org/10.1515/znb-1993-0722" @default.
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