125994-41-4Relevant academic research and scientific papers
Synthesis and structure of rare zwitterionic complexes involving the presence of N(py)MCl3? moieties (Mu202f=u202fPt(II), Pd(II))
Viola, Elisa,Donzello, Maria Pia,Ercolani, Claudio,Rizzoli, Corrado,Lever
, p. 101 - 107 (2018)
The monocation 2,3-dicyano-5-[(N-methyl)-2-pyridyl}-6-(2-pyridyl)pyrazine, [(CN)2(2-Mepy)PyPyz]+ (1) reacts, as the iodide salt (2), under mild experimental conditions, with dichloro-di(benzonitrile)platinum(II), [(C6H5CN)2PtCl2], forming trans-diiodo-di(benzonitrile)platinum(II), [(C6H5CN)2PtI2] (3), and the complex [(CN)2Py(2-Mepy)PyzPtCl3]?CH3CN (4), both structurally elucidated by single-crystal X-ray work. Using a parallel procedure, reaction of 2 with dichloro-di(benzonitrile)palladium(II), [(C6H5CN)2PdCl2], results in the formation of complex 5, [(CN)2Py(2-Mepy)PyzPdCl3]?CH3CN, isostructural with 4. Complex 5 is also formed by reaction of the same reactant 2 with PdCl2. Complexes 4 and 5, further characterized by IR and UV–vis spectral data, are neutral stable zwitterions presenting both a +1 pyridinium component neutralized by rare N(py)PtCl3? and N(py)PdCl3? anionic moieties, respectively (py = 2-pyridyl group). DFT calculations fit reasonably well with the observed UV–vis absorptions and provide information on the localization of the HOMO and LUMO within the species 4 and 5.
Synthesis and characterisation of mixed ligand Pt(ii) and Pt(iv) oxadiazoline complexes
Sarju, Julien,Arbour, Jannine,Sayer, James,Rohrmoser, Benjamin,Scherer, Wolfgang,Wagner, Gabriele
, p. 5302 - 5312 (2009/02/06)
The nitrile ligands in trans-[PtX2(PhCN)2] (X = Cl, Br, I) undergo sequential 1,3 dipolar cycloadditions with nitrones R 1R2C=N+(Me)-O- (R1 = H, R2 = Ph; R1 = CO2Et, R2 = CH 2CO2Et) to selectively form the Δ4-1,2,4- oxadiazoline complexes trans-[PtX2(PhCN) {N=C(Ph)-O-N(Me)-CR 1R2}] or trans-[PtX2{N=C(Ph)-O-N(Me)-CR 1R2}2] in high yields. The reactivity of the mixed ligand complexes trans-[PtX2(PhCN){N=C(Ph)-O-N(Me)-CR 1R2}] towards oxidation and ligand substitution was studied in more detail. Oxidation with Cl2 or Br2 provides the Pt(iv) species trans-[PtX2Y2(PhCN){N=C(Ph)-O-N(Me)- CH(Ph)}] (X, Y = Cl, Br). The mixed halide complex (X = Cl, Y = Br) undergoes halide scrambling in solution to form trans-[PtX(4-n)Y n(PhCN){N=C(Ph)-O-N(Me)-CH(Ph)}] as a statistical mixture. Ligand substitution in trans-[PtCl2(PhCN){N=C(Ph)-O-N(Me)-CR 1R2}] allows for selective replacement of the coordinated nitrile by nitrogen heterocycles such as pyridine, DMAP or 1-benzyl-2- methylimidazole to produce mixed ligand Pt(ii) complexes of the type trans- [PtX2(heterocycle){N=C(Ph)-O-N(Me)-CR1R2}]. All compounds were characterised by elemental analysis, mass spectrometry, IR and 1H, 13C and 195Pt NMR spectroscopy. Single-crystal X-ray structural analysis of (R,S)-trans-[PtBr 2{N=C(Ph)-O-N(Me)-CH(Ph)}2] and trans-[PtCl 2(C5H5N){N=C(Ph)-O-N(Me)-CH(Ph)}] confirms the molecular structure and the trans configuration of the heterocycles relative to each other. The Royal Society of Chemistry.
