The ditopic ligands 4′-(diphenylphosphino)-2,2′ : 6′,2 ″-terpyridine L1 and 4′-(oxodiphenylphosphanyl)-2,2′ : 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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Abstract
The new compound 4′-(diphenylphosphino)-2,2′:6′,2 ″-terpyridine L 1 has been prepared; in solution it readily oxidises to the corresponding phosphine oxide, L 2 . The reaction between L 1 and FeCl 2 ·4H 2 O yielded salts containing [FeL 1 2 ] 2+ , however, oxidation resulted in the formation of [FeL 2 2 ] 2+ . The corresponding ruthenium(II) complex of L 2 has also been prepared and structurally characterised as the hexafluorophosphate salt; attempts to prepare [RuL 1 2 ] 2+ always resulted in oxidation of the ligand to L 2 . The reaction of L 1 with cobalt(II) acetate gave [CoL 1 2 ] 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 L 1 also reacts with [PdCl 2 (NCMe) 2 ] to give trans-[PdCl 2 L 1 2 ] which has been fully characterised; results of an X-ray diffraction study confirm the trans configuration of the complex.

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