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Phosphido-bis(borane) complexes of the alkaline earth metals

Lookup NU author(s): Dr Keith Izod, James Watson, Dr Ross Harrington, Emeritus Professor Bill CleggORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2021.

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The reaction between two equivalents of {(Me3Si)2CH}(Ph)PH(BH3) (1) and Bu2Mg, followed by two equivalents of BH3·SMe2, gives the corresponding phosphido-bis(borane) complex, which may be crystal- lised as two distinct chemical species: the complex [{(Me3Si)2CH}(Ph)P(BH3)2]2Mg(THF)4·THF (2a), and two different THF solvates (1 : 1 and 1 : 2) of the solvent-separated ion triples [{(Me3Si)2CH}(Ph)P(BH3)2]2[Mg (THF)6]·THF (2b) and [{(Me3Si)2CH}(Ph)P(BH3)2]2[Mg(THF)6]·2THF (2c). Similar reactions between two equivalents of 1 and either (4-tBuC6H4CH2)2Ca(THF)4 or [(Me3Si)2CH]2Sr(THF)2, followed by two equiva- lents of BH3·SMe2, give the heavier alkali metal complexes [{(Me3Si)2CH}(Ph)P(BH3)2]2M(THF)4 [M = Ca (3), Sr (4)]. Surprisingly, compounds 2a, 3 and 4 adopt almost identical structures in the solid state, which differ only in the geometrical arrangement of the phosphido-bis(borane) ligands and the hapticity of the borane groups.

Publication metadata

Author(s): Izod K, Watson JM, Harrington RW, Clegg W

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2021

Volume: 50

Issue: 3

Pages: 1019-1024

Print publication date: 21/01/2021

Online publication date: 23/12/2020

Acceptance date: 14/12/2020

Date deposited: 27/01/2021

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry


DOI: 10.1039/d0dt03895d


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