Titanium(IV) iodide complexes with phosphine and arsine donor ligands and the crystal structures of the iron(II)/(III) redox pair [FeI2{o-C6H4(AsMe2)2}2]0/+
摘要:
Red-brown [TiI4{o-C6H4(PMe2)(2)}] and [TiI4{o-C6H4(AsMe2)(2)}] have been prepared from the ligands and TiI4 in a 1:1 molar ratio in anhydrous CH2Cl2. They have been characterised by analysis, IR, H-1 and P-31{H-1} NMR and UV-Visible spectroscopy as appropriate and have six-coordinate (cis) octahedral geometries. Investigation of the yellow or fawn products from reactions of TiI4 and the ligands in a 1:2 molar ratio, and suggested in the literature to be bis(ligand)-Ti(IV) complexes, have shown that these are mixtures containing iodinated and oxidised ligands, but do not contain Ti(IV)-iodide complexes. The crystal structures of two iron-diarsine complexes [FeI2{o-C6H4(AsMe2)(2)}(2)] and [FeI2{o-C6H4(AsMe2)(2)}(2)]I-3 . 2CH(2)Cl(2) arising from iron iodide impurities in one commercial sample of TiI4 are reported. The complexes constitute a redox pair and the iron(III) complex is the first pseudo-octahedral iron(III) iodide complex to be structurally characterised. (C) 2003 Elsevier Ltd. All rights reserved.
Titanium(IV) iodide complexes with phosphine and arsine donor ligands and the crystal structures of the iron(II)/(III) redox pair [FeI2{o-C6H4(AsMe2)2}2]0/+
摘要:
Red-brown [TiI4{o-C6H4(PMe2)(2)}] and [TiI4{o-C6H4(AsMe2)(2)}] have been prepared from the ligands and TiI4 in a 1:1 molar ratio in anhydrous CH2Cl2. They have been characterised by analysis, IR, H-1 and P-31{H-1} NMR and UV-Visible spectroscopy as appropriate and have six-coordinate (cis) octahedral geometries. Investigation of the yellow or fawn products from reactions of TiI4 and the ligands in a 1:2 molar ratio, and suggested in the literature to be bis(ligand)-Ti(IV) complexes, have shown that these are mixtures containing iodinated and oxidised ligands, but do not contain Ti(IV)-iodide complexes. The crystal structures of two iron-diarsine complexes [FeI2{o-C6H4(AsMe2)(2)}(2)] and [FeI2{o-C6H4(AsMe2)(2)}(2)]I-3 . 2CH(2)Cl(2) arising from iron iodide impurities in one commercial sample of TiI4 are reported. The complexes constitute a redox pair and the iron(III) complex is the first pseudo-octahedral iron(III) iodide complex to be structurally characterised. (C) 2003 Elsevier Ltd. All rights reserved.