Three New Mixed-Alkali- and Alkaline-Earth-Metal Borates: From 1D Chain to 2D Layer to 3D Framework

Three new mixed-metal borates, K4Ba2[B14O20(OH)10]·3H2O (1), LiSr2[B10O16(OH)3] (2), and LiBa­[B9O15] (3), have been made under hydro­(solvo)­thermal conditions and characterized by means of IR, UV–vis–near-IR, thermogravimetric analysis, powder X-ray diffraction, and single-crystal X-ray diffraction, respectively. 1 is a 1D chain constructed from B14O21(OH)1010– cluster units, 2 is of a 2D layer with nine-membered-ring windows built up of B10O19(OH)39– cluster units, while 3 exhibits a 3D framework with 12-membered-ring channels composed of B3O7 cluster units.