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Issue 21, 2005
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Synthesis and characterisation of second-generation metallodithiolene complexes of the type [Tp*ME(dithiolene)] (M = Mo, W; E = O, S) and a novel ‘organoscorpionate’ complex of tungsten

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Abstract

Paramagnetic, chalcogenido–M(V) dithiolene complexes, [Tp*ME{S2C2(CO2Me)2}] [M = Mo, E = O (1), S (2); M = W, E = O (3), S (4); Tp* = hydrotris(3,5-dimethylpyrazol-1-yl)borate] are generated in the reactions of dimethyl acetylenedicarboxylate (DMAC) and the sulfur-rich complexes NEt4[Tp*MoS(S4)] and NEt4[Tp*WS3]; the oxo complexes result from hydrolysis of the initial sulfido products. As well, a novel ‘organoscorpionate’ complex, [W{S2C2(CO2Me)2}{SC2(CO2Me)2–Tp*}] (5), has been isolated from the reactions of NEt4[Tp*WS3] with excess DMAC. Complexes 1, 4 and 5 have been isolated and characterised by microanalytical, mass spectrometric, spectroscopic and (for 4 and 5) X-ray crystallographic techniques. Complexes 2 and 3 have been partially characterised by mass spectrometry and IR and EPR spectroscopy. Six-coordinate, distorted-octahedral 4 contains a terminal sulfido ligand (W[double bond, length as m-dash]S = 2.108(3) Å), a bidentate dithiolene ligand (S–Cav = 1.758 Å, C[double bond, length as m-dash]C = 1.332(10) Å) and a fac-tridentate Tp* ligand. Seven-coordinate 5 contains a planar, bidentate dithiolene ligand (S–Cav = 1.746 Å, C[double bond, length as m-dash]C = 1.359(5) Å) and a novel pentadentate ‘organoscorpionate’ ligand formed by the melding of DMAC, sulfido and trispyrazolylborate units. The latter is coordinated through two pyrazolyl N atoms (κ2-N,N′) and a tridentate κ3-S,C,C′ unit appended to N-β of the third (uncoordinated) pyrazolyl group. The second-generation [Tp*ME(dithiolene)] complexes represent a refinement on first-generation [Tp*ME(arene-1,2-dithiolate)] complexes and their synthesis affords an opportunity to compare and contrast the electronic structures of true vs. pseudo-dithiolene ligands in otherwise analogous complexes.

Graphical abstract: Synthesis and characterisation of second-generation metallodithiolene complexes of the type [Tp*ME(dithiolene)] (M = Mo, W; E = O, S) and a novel ‘organoscorpionate’ complex of tungsten

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Publication details

The article was received on 29 Apr 2005, accepted on 04 Jun 2005 and first published on 26 Sep 2005


Article type: Paper
DOI: 10.1039/B506050H
Citation: Dalton Trans., 2005,0, 3552-3557
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    Synthesis and characterisation of second-generation metallodithiolene complexes of the type [Tp*ME(dithiolene)] (M = Mo, W; E = O, S) and a novel ‘organoscorpionate’ complex of tungsten

    S. A. Sproules, H. T. Morgan, C. J. Doonan, J. M. White and C. G. Young, Dalton Trans., 2005, 0, 3552
    DOI: 10.1039/B506050H

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