A New Tubular Borate Built By [B₁₄O₂₄(OH)₆]¹²⁻ Cluster Units

Abstract

A new mixed alkali and alkaline-earth metal borate Na₄Ca₂[B₁₄O₂₂(OH)₆]·2H₂O(1) has been made under a mild solvothermal condition and characterized by single-crystal X-ray diffraction, infrared(IR) spectroscopy, UV-Vis diffuse reflectance spectroscopy, powder X-ray diffraction and thermogravimetric analysis, respectively. Compound 1 features a 1D tube based on [B₁₄O₂₄(OH)₆]¹²⁻({B₁₄}-1) oxo-boron clusters. Such a tube built by {B₁₄}-1 units has been discovered for the first time in borate system. These tubes are arranged orderly to generate 2D layers and a further 3D supramolecular network through hydrogen bond interactions. UV-Vis diffuse reflectance spectrum reveals that compound 1 is a wide band-gap semiconductor and has potential application in UV region.

Keywords

Alkali and alkaline-earth metal / Borate / Tube / Solvothermal synthesis / Cluster

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