The synthesis of small boron oxide nanoparticles (NPs) is reported. A sonochemical approach in the presence of a capping agent was employed to produce approximately 4-5-nm-sized BO NPs, including the B isotopically enriched form. The morphology and composition of the NPs were established using transmission electron microscopy and diffraction, respectively. X-ray photoelectron and Fourier transform infrared spectroscopies provided information about surface functionalization of the BO NPs, which can be further modified through a facile, one-step ligand-exchange process. The toxicity of the synthesized NPs was investigated in Chinese hamster ovarian cells, indicating that these systems were nontoxic up to 1.7 mM concentrations.
We demonstrate that the bench-stable closo-hexaborate cluster dianions can engage in a nucleophilic substitution reaction with a wide array of organic and main-group electrophiles without the use of metal catalysts. The resulting molecules containing B-C bonds can be further converted to tricoordinate boron species widely used in organic synthesis. This strategy showcases a unique substitution and deconstruction reaction sequence with a sterically unprotected nucleophile to afford boronic acid pinacol esters without the use of metal catalysis.
Bromination of the luminescent borane, anti-B18H22, via electrophilic substitution using AlCl3 and Br2, yields the monosubstituted derivative 4-Br-anti-B18H21 as an air-stable crystalline solid.
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