Exopolyhedral Ligand Orientation Controls Diastereoisomer in Mixed-Metal Bis(carboranes).



Chan, Antony PY ORCID: 0000-0002-4518-9463, Rosair, Georgina M and Welch, Alan J ORCID: 0000-0003-4236-2475
(2020) Exopolyhedral Ligand Orientation Controls Diastereoisomer in Mixed-Metal Bis(carboranes). Molecules (Basel, Switzerland), 25 (3). E519-.

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Abstract

Heterobimetallic derivatives of a bis(carborane), [μ<sub>7,8</sub>-(1',3'-3'-Cl-3'-PPh<sub>3</sub>-<i>closo</i>-3',1',2'-RhC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>)-2-(<i>p</i>-cymene)-<i>closo</i>-2,1,8-RuC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>] (<b>1</b>) and [μ<sub>7,8</sub>-(1',3'-3'-Cl-3'-PPh<sub>3</sub>-<i>closo</i>-3',1',2'-RhC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>)-2-Cp-<i>closo</i>-2,1,8-CoC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>] (<b>2</b>) have been synthesised and characterised, including crystallographic studies. A minor co-product during the synthesis of compound <b>2</b> is the new species [8-{8'-2'-H-2',2'-(PPh<sub>3</sub>)<sub>2</sub>-<i>closo</i>-2',1',8'-RhC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>}-2-Cp-<i>closo</i>-2,1,8-CoC<sub>2</sub>B<sub>9</sub>H<sub>10</sub>] (<b>3</b>), isolated as a mixture of diastereoisomers. Although, in principle, compounds <b>1</b> and <b>2</b> could also exist as two diastereoisomers, only one (the same in both cases) is formed. It is suggested that the preferred exopolyhedral ligand orientation in the rhodacarboranes in the non-observed diastereoisomers would lead to unacceptable steric crowding between the PPh<sub>3</sub> ligand and either the <i>p</i>-cymene (compound <b>1</b>) or Cp (compound <b>2</b>) ligand of the ruthenacarborane or cobaltacarborane, respectively.

Item Type: Article
Uncontrolled Keywords: Boranes, Models, Molecular
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Jul 2021 10:35
Last Modified: 26 Jan 2024 13:17
DOI: 10.3390/molecules25030519
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3129992