525602-28-2Relevant academic research and scientific papers
Organoplatinum complexes containing bis(diphenylphosphino)amine as ligand: Uncommon case of N-H?I-Pt hydrogen bonding
Hoseini, S. Jafar,Mohammadikish, Maryam,Kamali, Katayon,Heinemann, Frank W.,Rashidi, Mehdi
, p. 1697 - 1704 (2007/10/03)
The complex [PtMe2(dppa)], 1a, dppa = Ph2PNHPPh2, which has previously been prepared as a mixture with the dimeric form [Pt2Me4(-dppa)2], was synthesized in pure form by the reaction of [PtCl2(dppa)] with MeLi. The aryl analogue [Pt(p-MeC6H4)2(dppa)], 1b, was prepared by replacement of SMe2in cis-[Pt(p-MeC6H4)2(SMe2)2] with dppa. The reaction of the chelate complexes 1 with one equiv. of dppa afforded the complexes [PtR2(dppa-P)2], RMe, 2a and R = p-MeC6H42b. The reaction of [PtR2(dppa)], 1, with neat MeI gave the organoplatinum(iv) complexes [PtR2MeI(dppa)], RMe, 5a and R = p-MeC6H4, 5b. The structure of 5a, determined by X-ray crystallography, indicated that the complex undergoes self-assembly by intermolecular N-H?I-Pt hydrogen bonding. MeI was also double oxidatively added to organodiplatinum(ii) complex cis,cis-[Me2Pt(-SMe2)(-dppa)PtMe2], to give diorganoplatinum(iv) complex [Me3Pt(-dppa)(-I)2PtMe3], 4. The aryl analogue organodiplatinum(ii) complex cis,cis-[(p-MeC6H4)2Pt(-SMe2)(-dppa)Pt(p-MeC6H4)2], 3b, was prepared by the reaction of cis-[Pt(p-MeC6H4)2(SMe2)2] with half equiv. of dppa, but 3b refused to react with MeI, probably because of the steric effects of the aryl ligands. The tetramethyl complex [PtMe4(dppa)], 6, was prepared either by reaction of 5a with MeLi or by replacement of SMe2in [Pt2Me8(-SMe2)2] with dppa. All the complexes were fully characterized in solution by multinuclear NMR (1H,13C,31P and195Pt) methods and their coordination compared with that of the corresponding known dppm complexes. The Royal Society of Chemistry.
Synthesis and thermochemical study of ligand substitution reactions of aminobis(phosphines), Ph2P(R)NPPh2, with [Me 2Pt(COD)]
Balakrishna, Maravanji S.,Priya, Srinivasan,Sommer, William,Nolan, Steven P.
, p. 2817 - 2820 (2008/10/09)
The reactions of aminobis(phosphines), Ph2PN(R)PPh2 (R = H, Me, Et, nPr, nBu, Ph), with Me2Pt(COD) led to the formation of four-membered metallacycles in good yield. The enthalpies of the ligand subst
Binuclear dimethylplatinum (II) complexes each containing monodentate phosphine ligands and a bridging diphosphine ligand X(PPh2) 2, X = CH2 or NH. Molecular structure of cis,cis-[Me 2(pyPh2P)Pt(μ-Ph2PNHPPh2) Pt(PPh2py) Me2]·2CH2Cl2
Rashidi, Mehdi,Kamali, Katayoon,Jennings, Michael C.,Puddephatt, Richard J.
, p. 1600 - 1605 (2007/10/03)
Displacement of the labile bridging SMe2 ligand in the organodiplatinum(II) complexes cis,cis-[Me2Pt(μ-SMe 2){μ-X(PPh2)2}PtMe2], in which X(PPh2)2 is either bis(diphenylphosphino)amine [dppa (X = NH)], 1a, or bis(diphenylphosphino)methane [dppm (X = CH2)], 1b, with 2 equiv of some monodentate phosphine ligands, L, gave a series of organodiplatinum(II) complexes with general formula cis,cis-[Me 2LPt(μ-dppa)PtLMe2][L = PPh3, 2a, PPh 2py(2-diphenylphosphinopyridine, PN), 3a, or P(O-iPr) 3, 4a] or cis,cis-[Me2LPt(μ-dppm)PtLMe2][L = PPh3, 2b, PN, 3b, or P(O-iPr)3, 4b] in good yields. In these complexes the two metallic centers are held together by only one bridging diphosphine ligand with no metal-metal bond. When L is PPh 2Me or PPhMe2, the diplatinum(II) complexes are split to the corresponding monomers, [PtMe2{X(PPh2)2}] and cis-[PtMe2L2]. No reaction was observed when L is pyridine or SMe2. The complexes were fully characterized using multinuclear NMR (1H, 13C, 31P and 195Pt) methods, and the structure of cis,cis-[Me 2(pyPh2P)Pt(μ-Ph2PNHPPh2) Pt(PPh2py)Me2]·2CH2Cl2, 3a, has been determined crystallographically.
A comparison of binuclear dimethylplatinum(II) complexes with the bridging ligands X(PPh2)2, X = CH2 or NH
Jamali, Sirous,Rashidi, Mehdi,Jenning, Michael C.,Puddephatt, Richard J.
, p. 2313 - 2317 (2007/10/03)
The reaction of [Pt2Me4(μ-SMe2)2], 1, with dppa = Ph2PNHPPh2 gave the complex [Pt2Me4(μ-SMe2)(μ-dppa)] and, with more dppa, a mixture of the binuclear complex [Pt2Me4(μ-dppa)2] and the mononuclear complex [PtMe2(dppa)]. In contrast, reaction of [Pt2Me4(μ-
