Three new aluminoborates: from 1D tube to 3D framework.

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystal Engineering

Background:

• Aluminoborates (ABOs) are a class of inorganic compounds with diverse structural possibilities.
• Exploring new ABO structures can lead to materials with unique properties.
• Solvothermal synthesis is a versatile method for creating novel crystalline materials.

Purpose of the Study:

• To synthesize and characterize new aluminoborate compounds.
• To investigate the structure-property relationships in newly formed ABO materials.
• To explore the potential applications of these ABOs in the deep ultraviolet (DUV) region.

Main Methods:

• Solvothermal synthesis was employed to create three new aluminoborates.
• Single-crystal X-ray diffraction was used to determine the crystal structures.
• UV-vis diffuse reflectance spectroscopy was performed to assess optical properties.

Main Results:

• Three new aluminoborates (ABOs) KCs[Al{B5O9(OH)}{BO(OH)2}] (1), K0.5Cs[Al{B5O10}1/2{BO2(OH)}] (2), and Cs1.5[Al{B5O10}1/2{BO2(OH)}] (3) were successfully synthesized.
• Compound 1 exhibits a 1D tube structure, while compounds 2 and 3 form isostructural 3D frameworks.
• The structures are built from [B5O9(OH)]4-, [BO(OH)2]-, [B5O10]5-, AlO4, and [BO2(OH)]2- building units.
• UV-vis spectra indicate potential applications in the deep ultraviolet (DUV) range.

Conclusions:

• Novel 1D and 3D aluminoborate structures were discovered.
• The structural dimensionality can be tuned by adjusting solvent conditions.
• The synthesized aluminoborates show promise for deep ultraviolet (DUV) applications.