15274-33-6Relevant articles and documents
Enhanced Catalytic Activity of (DMSO)2PtCl2 for the Methane Oxidation in the SO3-H2SO4 System
Dang, Huyen Tran,Lee, Hee Won,Lee, Jieon,Choo, Hyunah,Hong, Soon Hyeok,Cheong, Minserk,Lee, Hyunjoo
, p. 11854 - 11862 (2018)
Among the various methane activation reactions, oleum-mediated (SO3-H2SO4) methane oxidation to methyl bisulfate (MBS), a methanol precursor, is one of the best methods in terms of methane conversion and product selectivity. In this report, we investigated the effect of the catalyst concentration on the MBS yield using the catalyst systems (bpym)PtCl2, K2PtCl4, and (DMSO)2PtCl2 at 180 °C for 3 h. (bpym)PtCl2 showed a very high stability as well as a high MBS yield of over 84%, but its catalytic activity expressed in terms of turnovers for 3 h was in the range 50-500. K2PtCl4 showed very high catalyst turnovers of over 17 000 at a low catalyst concentration; however, it deactivated rapidly to PtCl2 which prevents achieving a high MBS yield that was achieved by (bpym)PtCl2. However, (DMSO)2PtCl2 showed an enhanced catalytic performance for both the MBS yield and the turnovers. An MBS yield of over 84% with a selectivity of 94% was obtained at a catalyst concentration of 3.0 mM, and its turnovers reached over 19 000 at a low catalyst concentration. This higher catalytic performance of (DMSO)2PtCl2 compared to the other chloride-ligated Pt compounds is due to the DMSO ligand on the Pt, which increases the solubility of the Pt species in oleum. Furthermore, as the DFT study revealed, the low dissociation energy of DMSO from the Pt center can facilitate the coordination of methane on the Pt reaction center. Although (DMSO)2PtCl2 was deactivated to PtCl2 after the reaction like the other Pt compounds with the chloride ligand, it can be reactivated to some extent by adding DMSO.
Multinuclear magnetic resonance characterization and antiproliferative studies of novel dichlorido platinum(II) complexes containing kinetin riboside and 1-β-D-ribofuranosyl-4-(2-pyridyl)-1H-1,2,3-triazole
Jakubowski, Mateusz,?akomska, Iwona,Sitkowski, Jerzy,Pokrywczyńska, Marta,D?browski, Pawe?,Framski, Grzegorz,Ostrowski, Tomasz
, (2020/02/15)
The chemical reaction between cis-[PtCl2(dmso)2] and kinetin riboside (KR) or 1-β-D-ribofuranosyl-4-(2-pyridyl)-1H-1,2,3-triazole (PTR) has resulted in two novel platinum(II) complexes being obtained with different compositions of the coordination sphere: cis-[PtCl2(PTR)] (1) and cis-[PtCl2(dmso)(KR)] (2). Based on multinuclear NMR results (1H, 13C, 15N, 195Pt), we have demonstrated that the N-donor ligands PTR and KR are able to coordinate to the Pt(II) ion as bidentate via two nitrogen atoms (N(3) and N(7)) or monodentate via only one nitrogen atom (N(7)), respectively. On the other hand, biological studies showed that the novel platinum(II) complexes exhibit different in vitro cytotoxicity towards A549 (lung carcinoma epithelial cells), T24 (urinary bladder cancer cells) and CRL1872 (malignant melanoma cells). The complex cis-[PtCl2(dmso)(KR)] (2) shows in vitro cytotoxicity against T24 and CRL1872 cell lines (the IC50 parameters amount to 52.2 μM and 21.4 μM, respectively), whereas cis-[PtCl2(PTR)] (1) is not able to inhibit a proliferation of these cells in the range of tested concentrations.
Chelating and Bridging Roles of 2-(2-Pyridyl)benzimidazole and Bis(diphenylphosphino)acetylene in Stabilizing a Cyclic Tetranuclear Platinum(II) Complex
Nabavizadeh, S. Masoud,Niroomand Hosseini, Fatemeh,Niknam, Fatemeh,Hamidizadeh, Peyman,Hoseini, S. Jafar,Ford, Peter C.,Abu-Omar, Mahdi M.
, p. 14617 - 14625 (2019/11/03)
The reaction of complex [Pt(Me)(DMSO)(pbz)], 1, (pbz = 2-(2-pyridyl)benzimidazolate) with [PtMe(Cl)(DMSO)2], B, followed by addition of bis(diphenylphosphino)acetylene (dppac), gave the novel tetranuclear platinum complex [Pt4Me4(μ-dppac)2(pbz)2Cl2], 2, bearing both the pbz and dppac ligands. In this structure, the pbz ligands are both chelating and bridging to stabilize the tetraplatinum framework. The tetranuclear Pt(II) complex was fully characterized by NMR spectroscopy, X-ray crystallography, and mass spectrometry, and its electronic structure was investigated and supported by DFT calculations.
