Synthesis and properties of monometallic, homo- and heterobimetallic complexes based on {(η6-arene)RuCl}+ and {(η6-arene)OsCl}+ fragments with tetrathioether and tetraselenoether ligands
作者:William Levason、Catherine Marshall、Luke P. Ollivere、Gillian Reid、Nikolaos Tsoureas、Michael Webster
DOI:10.1016/j.jorganchem.2010.05.010
日期:2010.8
The reaction of [Ru(eta(6)-p-cymene)Cl-2](2) with 2.0 mol equivalents of C(CH2SMe)(4), C(CH2SeMe)(4), 1,2,4,5-C6H2(CH2SMe)(4) or 1,2,4,5-C6H2(CH2SeMe)(4) (L-4) and [NH4][PF6] in ethanol solution forms the [RuCl(eta(6)-p-cymene)kappa(2)-L-4}][PF6] complexes. Similar Os(II) complexes are obtained starting with [Os(eta(6)-p-cymene) Cl-2](2). Treatment of [RuCl(eta(6)-p-cymene)kappa(2)-L-4}][PF6] with a further 0.5 mol equivalents of [Ru(eta(6)-pcymene) Cl-2](2) or reaction of [Ru(eta(6)-p-cymene) Cl-2](2) directly with 1.0 mol equivalent of L-4 forms the homobimetalllic [RuCl(eta(6)-p-cymene)} 2kappa(2) k'(2)-L-4}][PF6](2). Reaction of [OsCl(eta(6)-p-cymene)-kappa(2)-C (CH2SeMe)(4)}][PF6] with [Ru(eta(6)-p-cymene) Cl-2](4) or [PtCl2(MeCN)(2)] affords the heterobimetallic [OsCl(eta(6)p- cymene)}RuCl(eta(6)-p-cymene)}kappa(2) k'(2)-C(CH2SeMe)(4)}][PF6](2) and [OsCl(eta(6)-p-cymene)}PtCl2}kappa(2)k'(2)-C (CH2SeMe)(4)}][PF6] respectively. The complexes have been characterised by multinuclear NMR and IR spectroscopy and X-ray crystallography. (C) 2010 Elsevier B. V. All rights reserved.
Synthesis of sterically encumbered organoselenium species and their selectivity towards Hg(II) ions
作者:Monika Maheshwari、Shabana Khan、Jai Deo Singh
DOI:10.1016/j.tetlet.2007.05.020
日期:2007.7
The synthesis and characterization data for an intriguing family of sterically encumbered tetrasubstituted organoselenium species are described. The open exterior geometry and flexibility of the multiple soft selenium-containing donor arms enhances conformational organization thus allowing the molecule to reveal a propensity for trapping Hg(II) ions. Preliminary studies on the ion-sensing properties of these molecules revealed that they can act as selective ionophores for Hg(II) ions. (c) 2007 Elsevier Ltd. All rights reserved.