Aromatic polyhedral hydroxyborates: bridging boron oxides and boron hydrides.

Area of Science:

• Inorganic Chemistry
• Boron Hydride Chemistry
• Oxidation Reactions

Background:

• Icosahedral boron hydrides are a unique class of inorganic compounds with diverse structures.
• The reactivity of boron hydrides with oxidizing agents can be complex, sometimes leading to decomposition.
• Understanding the controlled functionalization of these cages is crucial for developing new materials and catalysts.

Purpose of the Study:

• To investigate the reaction of specific icosahedral boron hydrides with concentrated hydrogen peroxide.
• To determine if the reaction leads to cage degradation or controlled functionalization.
• To synthesize and characterize the resulting hydroxylated boron hydride species.

Main Methods:

• Refluxing of [closo-B12 H12 ](2-), [closo-CB11 H12 ](-), and closo-1,12-(CH2 OH)2 -1,12-C2 B10 H10 in 30% hydrogen peroxide.
• Isolation and characterization of the reaction products using spectroscopic techniques (implied).

Main Results:

• The reaction proceeds without explosion, indicating controlled reactivity.
• Per-B-hydroxylation of the boron cages occurs.
• Three new isoelectronic hydroxylated species were successfully obtained: [closo-B12 (OH)12 ](2-), [closo-1-H-1-CB11 (OH)11 ](-), and closo-1,12-H2 -1,12-C2 B10 (OH)10.

Conclusions:

• Concentrated hydrogen peroxide can be used as a reagent for the selective per-B-hydroxylation of icosahedral boron hydrides.
• This method provides a viable route to novel hydroxylated boron cage compounds.
• The observed reactivity highlights the stability and controlled functionalization potential of these boron hydride frameworks.