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), [μ7,8-(1',3'-3'-Cl-3'-PPh3-closo-3',1',2'-RhC2B9H10)-2-(p-cymene)-closo-2,1,8-RuC2B9H10] (1) and [μ7,8-(1',3'-3'-Cl-3'-PPh3-closo-3',1',2'-RhC2B9H10)-2-Cp-closo-2,1,8-CoC2B9H10] (2) have been synthesised and characterised, including crystallographic studies. A minor co-product during the synthesis of compound 2 is the new species [8-{8'-2'-H-2',2'-(PPh3)2-closo-2',1',8'-RhC2B9H10}-2-Cp-closo-2,1,8-CoC2B9H10] (3), isolated as a mixture of diastereoisomers. Although, in principle, compounds 1 and 2 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 PPh3 ligand and either the p-cymene (compound 1) or Cp (compound 2) 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: 12 Aug 2022 12:13
DOI: 10.3390/molecules25030519
URI: https://livrepository.liverpool.ac.uk/id/eprint/3129992