The Indium Borate In₁₉B₃₄O₇₄(OH)₁₁ with T2 Supertetrahedra

Abstract

The trigonal indium borate InBO(OH) was synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 13 GPa and 1150 °C. The crystal structure could be determined by single-crystal X-ray diffraction data collected at room temperature. InBO(OH) crystallizes in the trigonal space group R3̅ (Z = 3) with the lattice parameters a = 1802.49(6) pm, c = 1340.46(5) pm, and V = 3.7716(3) nm. The structure of InBO(OH) contains alternating B-O T2 supertetrahedra units. The presence of hydroxyl groups was confirmed with vibrational spectroscopic methods such as Raman and IR. Besides HInBO, InBO(OH) is now the second known compound in the system In-B-O-H.

Exploration into the Syntheses of Gallium‐ and Indiumborates under Extreme Conditions: M5B12O25(OH): Structure, Luminescence, and Surprising Photocatalytic Properties

“…The M −O bond lengths in the octahedra of Ga2 and In2 are hence slightly longer as in the regular Ga1 and In1 octahedra, respectively. With average interatomic distances of 1.97 and 2.15 Å and individual values ranging from 1.909(2)– 2.065(2) Å for Ga1 and 2.069(2)–2.247(2) Å for In1, the distances are in good agreement with those reported in the literature 3b, 4b, 6, 8. The distorted octahedra exhibit with 2.10 and 2.36 Å larger average distances and also quite uncommon maximal lengths of 2.307(2) Å for Ga2 and 2.748(2) Å for In2.…”

“…Lin and co‐workers showed an activity of roughly 30 μmol h −1  g −1 for Pt‐loaded TiO 2 11. Compared to other recently published borates of the 13th group of the periodic table, the herein described In 5 B 12 O 25 (OH) shows a high hydrogen evolution rate even without commonly employed co‐catalysts, such as Ni, Pt, or Ru 2, 4b, 5, 6, 12…”

“…Typical vibrations of InO 6 or GaO 6 octahedra appear at the lowest wavenumbers up to about 800 cm −1 4b, 6, 15. While those peaks in the IR spectra overlap with bands of the BO 4 bending and stretching vibrations, usually occurring at 800–1150 cm −1 , they can be distinguished in the Raman spectra 16.…”

Borates—Crystal Structures of Prospective Nonlinear Optical Materials: High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic Vibrations

“…Recently, this large B 4 O 10 tetrahedron was experimentally found for the first time by Wu et al in a borosilicate, Cs 2 B 4 SiO 9 (# 425583-ICSD), which has NLO properties in the deep-ultraviolet range [70]. In 2016, the 4B-group known as "supertetrahedron" was found in the new indium borate In 19 B 34 O 74 (OH) 11 , synthesized under high-pressure/high-temperature conditions by Huppertz et al [71]. Furthermore, it is worth noting that In 19 B 34 O 74 (OH) 11 is the first borate containing a supertetrahedron unit.…”

High‐Pressure Synthesis and Single‐Crystal Structure Elucidation of the Indium Oxide‐Borate In4O2B2O7

“…In 2010, this distinctive structure feature was found in H 2 InB 5 O 10 . In 2016, our group presented In 19 B 34 O 74 (OH) 11 , solely containing BO 4 groups, whereby the compound additionally exhibits an exceptional, supertetrahedral structure motif . Like In 19 B 34 O 74 (OH) 11 , the indium borate In 3 B 5 O 12 , reported shortly afterwards, also contains BO 4 units .…”