Scandium halide complexes of phosphine- and arsine-oxides: synthesis, structures and Sc-45 NMR studies


Hill, N. J., Levason, W., Popham, M. C., Reid, G. and Webster, M. (2002) Scandium halide complexes of phosphine- and arsine-oxides: synthesis, structures and Sc-45 NMR studies. Polyhedron, 21, (16), 1579-1588. (doi:10.1016/S0277-5387(02)01016-1).

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Description/Abstract

The reactions of ScCl(3)(.)6H(2)O, ScBr(3)(.)6H(2)O and Scl(3)(.)8H(2)O with Ph3PO, Ph3AsO, Ph2MePO, Me3PO and Me3AsO have been examined in EtOH or Me2CO solution. The new complexes [ScCl(Me3PO)(5)]Cl-2, [Sc(Me3PO)(6)]X-3 (X = Br or 1), [ScX,(Ph3PO)4]X (X = Cl, Br or 1), [ScX2(Ph3AsO)(4)]X, [Sc(Me3AsO)(6)]X-3 (X = Cl, Br or 1), [ScCl3(Ph2MePO)(3)] and [ScBr2(PhMePO)(4)]Br were isolated as solids and were characterised by analysis, IR and multinuclear (H-1, P-31{H}: and Sc-45) NMR spectroscopy and conductance measurements. The crystal structures of [ScBr2(Ph3PO)(4)]Br(.)1/2Et(2)O, [ScCl2(Ph3AsO)(4)]Cl and [Sc(Me3AsO)(6)]Br-3 are also reported. The solution speciation (in CH2Cl2 or MeNO2) in the various systems was examined by multinuclear NMR spectroscopy. The Sc-45 NMR chemical shifts and line widths show systematic trends with donor set and symmetry. which are described. No reaction between these ligands and ScF3.1/2H(2)O was observed.

Item Type: Article
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Keywords: scandium, phosphine oxide, arsine oxide, x-ray structures, sc-45 nmr crown-ether complexation, spectroscopic characterization, yttrium
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 19774
Date Deposited: 16 Feb 2006
Last Modified: 27 Mar 2014 18:09
URI: http://eprints.soton.ac.uk/id/eprint/19774

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