What question did this study set out to answer?

The aim is to synthesize and characterize two novel borate compounds with distinct structural features.

April 12, 2026Inorganic Chemistry1 citations

Two B 6 -Based Borates: From 1D Chain to 3D Framework

JZJin-Ni ZhaoBeijing Institute of Technology XSXiao-Shuang SunBeijing Institute of Technology JCJuan ChenBeijing Institute of Technology

Key Points

The aim is to synthesize and characterize two novel borate compounds with distinct structural features.
Synthesis of Na2Ca2[B6O9(OH)4]·SO4 and KNa2[B6O10]·HCOO under solvothermal conditions
Characterization of structural frameworks using UV-vis diffuse reflectance spectra
Assessment of second-harmonic-generation response of both compounds
Compound 1 features a unique 1D anionic chain formed by [B6O11(OH)4] clusters
Compound 2 presents a 3D open-framework built from [B6O13] clusters with interwoven channels
Both compounds show ultraviolet absorption cutoff edges, with compound 2 exhibiting a second-harmonic-generation intensity 1.4 times that of KDP

Abstract

Two mixed alkali- and alkaline-earth metal borates, Na2Ca2B6O9(OH)4·SO4 (1) and KNa2B6O10·HCOO (2), have been synthesized under solvothermal conditions. 1 features an anionic chain constructed from novel B6O11(OH)48- clusters, which are linked by the hydrogen bond to form a supramolecular framework. 2 exhibits a 3D open-framework built from bowl-shaped B6O138- clusters and contain interwoven 9-membered ring channels extending along three directions within K+, Na+, and HCOO- ions selectively accommodated, respectively. UV-vis diffuse reflectance spectra reveal that both compounds have ultraviolet absorption cutoff edges. Notably, 2 exhibits a moderate second-harmonic-generation response, with an intensity approximately 1.4 times that of KH2PO4 (KDP).

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