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DOI: 10.1039/A702023F (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 2427-2434

The ditopic ligands 4′-(diphenylphosphino)-2,2′[hair space]:[hair space]6′,2 ″-terpyridine L1 and 4′-(oxodiphenylphosphanyl)-2,2′[hair space]:[hair space]6′,2 ″-terpyridine L2: co-ordination to iron(II), ruthenium(II), cobalt(II) and palladium(II); crystal structures of [RuL22][PF6]2·H 2O·MeCN and trans-[PdCl2L12]· 2.5CH2Cl2

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Edwin C. Constable, Catherine E. Housecroft, Markus Neuburger, Alain G. Schneider and Margareta Zehnder

Abstract

The new compound 4′-(diphenylphosphino)-2,2′[hair space]:[hair space]6′,2 ″-terpyridine L1 has been prepared; in solution it readily oxidises to the corresponding phosphine oxide, L2. The reaction between L1 and FeCl2·4H2O yielded salts containing [FeL12]2+, however, oxidation resulted in the formation of [FeL22]2+. The corresponding ruthenium(II) complex of L2 has also been prepared and structurally characterised as the hexafluorophosphate salt; attempts to prepare [RuL12]2+ always resulted in oxidation of the ligand to L2. The reaction of L1 with cobalt(II) acetate gave [CoL12]2+ which has been isolated as the hexafluorophosphate salt. The complexes have been characterised by IR and NMR spectroscopies, mass spectrometry and elemental analysis. Compound L1 also reacts with [PdCl2(NCMe)2] to give trans-[PdCl2L12] which has been fully characterised; results of an X-ray diffraction study confirm the trans configuration of the complex.

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