5 research outputs found
Metal-Free Peralkylation of the <i>closo</i>-Hexaborate Anion
The synthesis of fully alkylated <i>closo</i>-hexaborate
dianions is reported. The reaction of [NBu<sub>4</sub>]Â[B<sub>6</sub>H<sub>6</sub>H<sup><i>fac</i></sup>], benzyl bromide, and
triethylamine under microwave heating conditions affords persubstituted
[NBu<sub>4</sub>]Â[B<sub>6</sub>(CH<sub>2</sub>Ar)<sub>6</sub>H<sup><i>fac</i></sup>] (Ar = C<sub>6</sub>H<sub>5</sub>, 4–Br-C<sub>6</sub>H<sub>4</sub>), which have been isolated and characterized
by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction,
and other spectroscopic techniques. Electrochemical studies of these
clusters reveal an irreversible one-electron oxidation, likely indicating
degradative cage rupture. The observed metal-free alkylation is proposed
to proceed as a consequence of the pronounced <i>nucleophilic</i> character of the hexaborate anion. This work represents the first
example of a perfunctionalized hexaborate cluster featuring B–C
bonds
Metal-Free Peralkylation of the <i>closo</i>-Hexaborate Anion
The synthesis of fully alkylated <i>closo</i>-hexaborate
dianions is reported. The reaction of [NBu<sub>4</sub>]Â[B<sub>6</sub>H<sub>6</sub>H<sup><i>fac</i></sup>], benzyl bromide, and
triethylamine under microwave heating conditions affords persubstituted
[NBu<sub>4</sub>]Â[B<sub>6</sub>(CH<sub>2</sub>Ar)<sub>6</sub>H<sup><i>fac</i></sup>] (Ar = C<sub>6</sub>H<sub>5</sub>, 4–Br-C<sub>6</sub>H<sub>4</sub>), which have been isolated and characterized
by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction,
and other spectroscopic techniques. Electrochemical studies of these
clusters reveal an irreversible one-electron oxidation, likely indicating
degradative cage rupture. The observed metal-free alkylation is proposed
to proceed as a consequence of the pronounced <i>nucleophilic</i> character of the hexaborate anion. This work represents the first
example of a perfunctionalized hexaborate cluster featuring B–C
bonds
Metal-Free Peralkylation of the <i>closo</i>-Hexaborate Anion
The synthesis of fully alkylated <i>closo</i>-hexaborate
dianions is reported. The reaction of [NBu<sub>4</sub>]Â[B<sub>6</sub>H<sub>6</sub>H<sup><i>fac</i></sup>], benzyl bromide, and
triethylamine under microwave heating conditions affords persubstituted
[NBu<sub>4</sub>]Â[B<sub>6</sub>(CH<sub>2</sub>Ar)<sub>6</sub>H<sup><i>fac</i></sup>] (Ar = C<sub>6</sub>H<sub>5</sub>, 4–Br-C<sub>6</sub>H<sub>4</sub>), which have been isolated and characterized
by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction,
and other spectroscopic techniques. Electrochemical studies of these
clusters reveal an irreversible one-electron oxidation, likely indicating
degradative cage rupture. The observed metal-free alkylation is proposed
to proceed as a consequence of the pronounced <i>nucleophilic</i> character of the hexaborate anion. This work represents the first
example of a perfunctionalized hexaborate cluster featuring B–C
bonds
Metal-Free Peralkylation of the <i>closo</i>-Hexaborate Anion
The synthesis of fully alkylated <i>closo</i>-hexaborate
dianions is reported. The reaction of [NBu<sub>4</sub>]Â[B<sub>6</sub>H<sub>6</sub>H<sup><i>fac</i></sup>], benzyl bromide, and
triethylamine under microwave heating conditions affords persubstituted
[NBu<sub>4</sub>]Â[B<sub>6</sub>(CH<sub>2</sub>Ar)<sub>6</sub>H<sup><i>fac</i></sup>] (Ar = C<sub>6</sub>H<sub>5</sub>, 4–Br-C<sub>6</sub>H<sub>4</sub>), which have been isolated and characterized
by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction,
and other spectroscopic techniques. Electrochemical studies of these
clusters reveal an irreversible one-electron oxidation, likely indicating
degradative cage rupture. The observed metal-free alkylation is proposed
to proceed as a consequence of the pronounced <i>nucleophilic</i> character of the hexaborate anion. This work represents the first
example of a perfunctionalized hexaborate cluster featuring B–C
bonds
Reversible Silver Electrodeposition from Boron Cluster Ionic Liquid (BCIL) Electrolytes
Electrochemical systems offer a versatile means for creating adaptive devices. However, the utility of electrochemical deposition is inherently limited by the properties of the electrolyte. The development of ionic liquids enables electrodeposition in high-vacuum environments and presents opportunities for creating electrochemically adaptive and regenerative spacecraft components. In this work we developed a silver-rich, boron cluster ionic liquid (BCIL) for reversible electrodeposition of silver films. This air and moisture stable electrolyte was used to deposit metallic films in an electrochemical cell to tune the emissivity of the cell <i>in situ</i>, demonstrating a proof-of-concept design for spacecraft thermal control