The Indium Borate In₁₉B₃₄O₇₄(OH)₁₁ with T2 Supertetrahedra

Abstract

The trigonal indium borate In 19 B 34 O 74 (OH) 11 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. In 19 B 34 O 74 (OH) 11 crystallizes in the trigonal space group R 3̅ (Z = 3) with the lattice parameters a = 1802.49(6) pm, c = 1340.46(5) pm, and V = 3.7716(3) nm 3 . The structure of In 19 B 34 O 74 (OH) 11 contains alternating B–O T2 supertetrahedra units. The presence of hydroxyl groups was confirmed with vibrational spectroscopic methods such as Raman and IR. Besides H 2 InB 5 O 10, In 19 B 34 O 74 (OH) 11 is now the second known compound in the system In–B–O–H.