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Issue 42, 2010
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Taking TiF4 complexes to extremes - the first examples with phosphine co-ligands

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Abstract

The first soft donor adducts of TiF4, [TiF4(diphosphine)] (diphosphine = o-C6H4(PMe2)2, R2P(CH2)2PR2, R = Me or Et) have been prepared from [TiF4(MeCN)2] and the diphosphines in rigorously anhydrous CH2Cl2, as extremely moisture sensitive yellow solids, and characterised by multinuclear NMR (1H, 31P, 19F), IR and UV/vis spectroscopy. The crystal structure of [TiF4{Et2P(CH2)2PEt2}] has been determined and shows a distorted six-coordinate geometry with disparate Ti–FtransF and Ti–FtransP distances and long Ti–P bonds. Weaker soft donor ligands including Ph3P, Ph2P(CH2)2PPh2, o-C6H4(PPh2)2, Ph2As(CH2)2AsPh2, o-C6H4(AsMe2)2 and iPrS(CH2)2SiPr do not form stable complexes with TiF4, although surprisingly, fluorotitanate(IV) salts of the previously unknown doubly protonated ligand cations [LH2][Ti4F18] (L = o-C6H4(PPh2)2, o-C6H4(AsMe2)2 and iPrS(CH2)2SiPr) are formed in some cases as minor by-products. The structure of [o-C6H4(PPh2H)2][Ti4F18] shows the first authenticated example of a diprotonated o-phenylene-diphosphine. The synthesis and full spectroscopic characterisation are reported for a range of TiF4 adducts with hard N– or O-donor ligands for comparison purposes, along with crystal structures of [TiF4(thf)2], [TiF4(Ph3EO)2]·2CH2Cl2 (E = P or As), and [TiF4(bipy)].

Graphical abstract: Taking TiF4 complexes to extremes - the first examples with phosphine co-ligands

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Publication details

The article was received on 29 Jun 2010, accepted on 17 Aug 2010 and first published on 30 Sep 2010


Article type: Paper
DOI: 10.1039/C0DT00747A
Citation: Dalton Trans., 2010,39, 10264-10271
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    Taking TiF4 complexes to extremes - the first examples with phosphine co-ligands

    M. Jura, W. Levason, E. Petts, G. Reid, M. Webster and W. Zhang, Dalton Trans., 2010, 39, 10264
    DOI: 10.1039/C0DT00747A

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