Two New Alkaline Metal Borates with Supramolecular Framework Constructed from 1D {B₅}/{B₆} Helical Chains

Abstract

Two new alkaline metal borates containing 1D {B₅}/{B₆} oxoboron helical chains, namely Na_0.5[B₅O₈(OH)₂]_0.5[B₅O₆(OH)₂]_0.5·0.5H₃O(1) and NaKCs[B₆O₉(OH) ₃](2) were synthesized under solvothermal conditions. Compound 1 contains the interesting alternative left- and right-handed helical {[B₅O₈(OH)₂][B₅O₆(OH)₂]}²⁻ ({B₅}-1 and {B₅}-2) 1D chains and compound 2 possesses the similar [B₆O₁₁(OH)₃]⁷⁻({B₆}) chains. Their 1D chains are further assembled into 2D layers and 3D supramolecular frameworks through O-H⋯O hydrogen bonds. In addition, the UV cutoff edge of compounds 1 and 2 is both below 190 nm.

Keywords

Alkaline metal borate / Solvothermal synthesis / Helical chain / Supramolecular framework

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