Two New Borates Built by Different Types of {B₉} Cluster Units

Abstract

Two new belt-like borates Na₄[B₉O₁₄(OH)₃]·0.5H₂O(1) and Na₅[B₉O₁₄(OH)₄](2) have been synthesized under solvothermal conditions. Both compounds contain unprecedented B₉O₁₆(OH) _n ⁽ⁿ⁺⁵⁾⁻[n=3(1), 4(2)] clusters, which are constructed from four B₃O₃ rings via three BO₄ tetrahedra. Compound 1 exhibits a rare 1D belt with two types of 8-membered ring(MR) windows based on B₉O₁₆(OH)₃ ⁸⁻ clusters. Compound 2 features two different 1D belts built by different B₉O₁₆(OH)₄ ⁹⁻ units, which is first discovered in borate family. UV-Vis diffuse reflectance spectra reveal that compounds 1 and 2 have the cut-off edges below 190 nm, indicating that they may have potential application in deep UV(DUV) region.

Keywords

Oxoboron cluster / Synthesis / Borate / Supramolecular framework / Structure

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