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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, Professor William Clegg

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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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Abstract

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

URL: https://doi.org/10.1039/d0dt03895d

DOI: 10.1039/d0dt03895d

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