Issue 3, 2021

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

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 crystallised 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 equivalents 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.

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

Supplementary files

Article information

Article type
Paper
Submitted
12 Nov 2020
Accepted
14 Dec 2020
First published
23 Dec 2020

Dalton Trans., 2021,50, 1019-1024

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

K. Izod, J. M. Watson, R. W. Harrington and W. Clegg, Dalton Trans., 2021, 50, 1019 DOI: 10.1039/D0DT03895D

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