P- versus P,O- coordination in complexes of N-(diphenylphosphino)arylamide ligands ArC(O)NHPPh2 (Ar=3-pyridyl, phenyl). X-ray crystal structures of [RhCl2(η5-C5Me5)L2] and [NiCl(EtOH)L22]·Cl·[NiCl2L22] (L2=C6H5CONHPPh2)

Synthesis and Structural Characterisation of an N-Phosphanyl Ferrocene Carboxamide and its Ruthenium, Rhodium and Palladium Complexes

[((Diphenylphosphanyl)amino)carbonyl]ferrocene (1) has been synthesized and coordinated to light platinum metals, ruthenium, rhodium and palladium, in diverse coordination modes. Specifically, compound 1 was used to prepare the following phosphane complexes, [(η⁶ -mes)RuCl₂ (1-κP)], [(η⁵ -C₅ Me₅ )RhCl₂ (1-κP)], trans-[PdCl₂ (1-κP)₂ ], and [(L^NC )PdCl(1-κP)] (mes=mesitylene, L^NC =[2-(dimethylamino-κN)methyl]phenyl-κC¹ ). They were subsequently converted into cationic O,P-chelate complexes by halide abstraction with AgClO₄ and into neutral O,P-chelate complexes by deprotonation with potassium tert-butoxide. All coordination compounds and phosphane chalcogenides 1E (P-bound chalcogen atom E=O, S and Se), which were also synthesised, were structurally characterised using spectroscopic methods (IR, multinuclear NMR and ESI MS) and single-crystal X-ray diffraction analysis. The electrochemical behaviour of the prepared compounds was studied by cyclic voltammetry, and the (L^NC )Pd-1 complexes were further studied by Mössbauer spectroscopy.