120272-57-3Relevant academic research and scientific papers
Reactions of triphenylbenzylphosphonium and tetraphenylstibonium chlorides with potassium tetrachloroplatinates in dimethylsulfoxide
Sharutin,Senchurin,Pakusina,Sharutina,Kunkurdonova
, p. 1753 - 1757 (2011/02/24)
Platinum complexes [Ph3PhCH2P]+[(Me 2S=O)PtCl3]- I and cis-Cl2(Ph 3Sb)(Me2S=O)Pt II were synthesized by reaction of triphenylbenzylphosphonium and tetraphenylstibonium chlorides with potassium tetrachloroplatinate in DMSO. Crystal I is formed by triphenylbenzylphosphonium tetrahedral cations [P-CPh 1.791(4)-1.795(4) A, P-C Alk 1.811(4) A; CPC 107.57(18)°-111.46(17)°] and by square anions [(Me2S=O)PtCl3]- [Pt-Cl 2.3236(11), 2.2981(12), 2.2977(11) A; Pt-S 2.1950(10) A; trans-angles SPtCl 177.51(4)°, ClPtCl 178.74(4)°]. In a square-planar complex II [trans-angles SPtCl 178.01(6)°, ClPtSb 177.96(4)°] with central platinum atom the chlorine atoms [Pt-Cl 2.308(1), 2.350(1) A], triphenylstibine [Pt-Sb 2.5118(4) A] and dimethyl sulfoxide [Pt-S 2.195(1) A] molecules are coordinated. Compound II is a first example of mixed ligand complex of platinum(II), where in the coordination sphere of central atom the tertiary stibine is present along with DMSO ligand.
Reduction of (imine)Pt(IV) to (imine)Pt(II) complexes with carbonyl-stabilized phosphorus ylides
Wagner,Pakhomova,Bokach,Frausto da Silva,Vicente,Pombeiro,Kukushkin
, p. 1683 - 1689 (2008/10/08)
A novel method is reported for generation of the difficult-to-obtain (imine)Pt(II) compounds that involves reduction of the corresponding readily available Pt(IV)-based imines by carbonyl-stabilized phosphorus ylides, Ph3P= CHCO2R, in nonaqueous media. The reaction between neutral (imino)Pt(IV) compounds [PtCl4{NH=C(Me)-ON=CR1R2}2] [R1R2 = Me2, (CH2)4, (CH2)5, (Me)C(Me)=NOH], [PtCl4{NH=C(Me)ONR2}2] (R = Me, Et, CH2Ph), [PtCl4{N=C(Me)O-N(R3)-C(R1) (R2)}2] (R1 = H; R2 = Ph or C6H4Me; R3 = Me) as well as anionic-type platinum(IV) complexes (Ph3PCH2Ph)[PtCl5{NH=C(Me) ON=CR2}] [R2 = Me2, (CH2)4, (CH2)5] and 1 equiv of Ph3P=CHCO2R (R = Me, Et) proceeds under mild conditions (ca. 4 h, room temperature) to give selectively the platinum(II) products (in good to excellent isolated yields) without further reduction of the platinum center. All thus prepared compounds (excluding previously described Δ4-1,2,4-oxadiazoline complexes) were characterized by elemental analyses, FAB mass spectrometry, IR and 1H, 13C{1H}, 31P(1H} and 195Pt NMR spectroscopies, and X-ray single-crystal diffractometry, the latter for [PtCl2{NH=C(Me)ON=CMe2}2] [crystal system tetragonal, space group P42/n (No. 86), a = b = 10.5050(10) A, c = 15.916(3) A] and (Ph3PCH2CO2-Me)[PtCl3(NCMe)] [crystal system orthorhombic, space group Pna21 (No. 33), a = 19.661(7) A, b = 12.486(4) A, c = 10.149(3) A]. The reaction is also extended to a variety of other Pt(II)/Pt(IV) couples, and the ylides Ph3P=CHCO2R are introduced as mild and selective reducing agents of wide applicability for the conversion of Pt(IV) to Pt(II) species in nonaqueous media, a route that is especially useful in the case of compounds that cannot be prepared directly from Pt(II) precursors, and for the generation of systematic series of Pt(II)/Pt(IV) complexes for biological studies.
