Chemie polyfunktioneller Moleküle, 121. Mitt. Cyclopentadienylruthenium(II)-Komplexe desBis(diphenylphosphanyl)amins und -amids sowie des N,N-Bis(diphenylphosphanyl)-methylamins und -ethylamins

Summary

This synthetic and structural work describes a series of half-sandwich cyclopentadienylruthenium(II) complexes containing the diphosphazane ligands [(C₆H₅)₂P]₂NR (R=H:Hdppa,1a;R=CH₃:dppma,1b;R=C₂H₅:dppea,1c;R=Li:Lidppa,1d). Treatment of1a, d with CpRuCl(PPh₃)₂ (Cp=η⁵-C₅H₅, Ph=C₆H₅,2) in a molar ratio of 1:1 in boiling aromatic hydrocarbons affords the neutral complexes CpRuCl(Hdppa) (3) and CpRu(dppa)PPh₃ (6). The ionic complexes [CpRu(Ph₂P-NR-(PPh₂)PPh₃)Cl (R=CH₃:4a;R=C₂H₅:4b) are formed by the reaction of1b,c with2. One pot reactions of1a–c with2 in the presence of NH₄PF₆ in boiling CH₃OH give only the ionic compounds [CpRu(Ph₂P-NR-PPh₂)(PPh₃)]PF₆ (R=H, CH₃, C₂H₅;5a–c). The sulfur dioxide and hydride complexes [CpRu(Hdppa)η¹-SO₂]Cl (7) and CpRu(H)Hdppa (8) are obtained by the interaction of3 with SO₂ or NaOCH₃. All compounds are characterized as far as possible by IR, Raman,³¹P{¹H} NMR,¹H NMR,¹³C{¹H} NMR, FD mass spectra, and their conductivity in CH₂Cl₂ solution. The X-ray crystal structures of3 and5a reveal that the P(1)-N(1)-P(2) angle of the coordinated ligand1a in both complexes is reduced to about 100° in comparison to free uncoordinated1a (119°). This small angle leads to a short P(1)–P(2) bond distance of 259.4 pm in3 and 254.3 pm in5a. The molecules of3 are connected by intermolecular (NH...Cl) hydrogen bridging bonds forming chains along thez axis of the unit cell. The crystals of5a contain two independent pairs of ions in the unit cell (Z=8). In5a no hydrogen bonds exist between the NH-groups and the PF ⁻₆ anions.