8 research outputs found
The First 8-Vertex Monocarbon Metallacarborane with an “Isolated” Boron-Capped Pentagonal Bipyramidal Cage. Synthesis and Molecular Structure of Capped closo
No full textCarboracycles: Macrocyclic Compounds Composed of Carborane Icosahedra Linked by Organic Bridging Groups
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Distorted <i>commo</i>-Cobaltacarboranes Based on the 5,6-Dicarba-<i>nido</i>-decaborane(12): The First Bimetal Cobalt–Copper Zwitterion-Containing Cluster with Four (B–H)<sub>4</sub>···Cu Bonds Not Showing Fluxional Behavior in Solution
No full textTreatment
of a recently reported complex [Ph<sub>4</sub>P][<i>closo,nido-</i>CoH(2,4-C<sub>2</sub>B<sub>8</sub>H<sub>10</sub>)(7,8-C<sub>2</sub>B<sub>8</sub>H<sub>11</sub>)] (<b>1</b>) either by H<sub>2</sub>O<sub>2</sub> in acetone or NaH in THF leads to the loss of
both the bridging and terminal hydrides yielding the diamagnetic salt
of an anionic <i>commo</i>-cobaltacarborane [Ph<sub>4</sub>P][Co(2,4-<i>isonido</i>-C<sub>2</sub>B<sub>8</sub>H<sub>10</sub>)<sub>2</sub>] (<b>2</b>) with the {CoC<sub>2</sub>B<sub>8</sub>}-cluster units adopting a distorted skeletal geometry
of the <i>isonido</i>-type. The anionic <i>commo</i> complex <b>2</b> reacts with in situ generated cationic [CuPPh<sub>3</sub>]<sup>+</sup> species to give stable copper–cobalt
zwitterion [Ph<sub>3</sub>PCu][Co(2,4-<i>isonido</i>-C<sub>2</sub>B<sub>8</sub>H<sub>10</sub>)<sub>2</sub>] (<b>3</b>) with four two-electron, three-center (B–H)<sub>4</sub>···Cu
bonds, and exhibits no fluxional behavior in solution. Complex <b>3</b>, at the same time, in CH<sub>2</sub>Cl<sub>2</sub> in the
presence of 2-fold excess of PPh<sub>3</sub> readily converts to a
new anionic species [(Ph<sub>3</sub>P)<sub>3</sub>Cu][Co(2,4-<i>isonido</i>-C<sub>2</sub>B<sub>8</sub>H<sub>10</sub>)<sub>2</sub>] (<b>4</b>) which retains initial <i>isonido</i> geometry. All newly obtained diamagnetic <i>commo</i> complexes
were characterized by a combination of analytical and multinuclear
NMR spectroscopic data and by single-crystal X-ray diffraction studies
of complexes <b>2</b> and <b>3</b>
Nomenclature for boranes and related species (IUPAC Recommendations 2019)
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An appraisal of the current IUPAC recommendations for the nomenclature of boranes and related systems has been undertaken. New developments in the field have been investigated and existing nomenclature systems have been adapted to accommodate these new developments. The principal areas considered are stoichiometric and structural nomenclature (including heteroatom and metal-atom subrogation, as well as substitution of hydrogen), conjoined-cage species, supra-icosahedral systems, and sub-icosahedral non-standard structures. Elements of substitutive, additive, and replacement nomenclature systems have been integrated into individual names to address contentious problems in boron nomenclature that have been around for a long time
