Binuclear platinum(II) complex with thiocarbamide bridges

A binuclear complex, diamminedithiocarbamide-μ-diamminedithiocarbamideplatinum(II) nitrate, was prepared by the reaction of tetrathiocarbamideplatinum(II) and diaquadiammineplatinum(II) nitrates. The composition and structure of the prepared complex were determined by elemental analysis, conductometry, and cryoscopy.     

Photochemical reaction of anthracene with dioxygen catalyzed by platinum(II) porphyrin

Visible light irradiation of anthracene in the presence of platinum(II) porphyrin (PtPor) and dioxygen affords anthraquinone as the main product. This reaction involves two steps: the [4+2]cycloaddition of anthracene with singlet oxygen to afford anthracene-9,10-endoperoxide and the degradation of endoperoxide. PtPor catalyzes both reactions.     

Sulfur- and oxygen-containing platinum(II) complex

Russian Journal of General Chemistry - Mixed-ligand platinum(II) complex with ethylenedithiodiacetic acid (HSSH) and thioglycolic acid has been synthesized. Ethyleneditiodiacetate is coordinated to...     

Extraction of cobalt(II) with 7-(1-decenyl)-8-quinolinol into chloroform

Extraction of cobalt(II) with 7-(1-decenyl)-8-quinolinol (HRql) into chloroform was examined. The best cobalt extraction occurs in the pH region 5.5–9. In this region several other cations are extracted. The values of K_ex and pH_0.5 for cobalt extraction were found to be ?8.6 and 3.19 respectively. The composition of the extracted complex was found to be Co(Rql)₃. Cobalt is poorly reextracted from Co-HRql complex into the aqueous phase, the best results were obtained using HCl as a stripping agent.     

Organogel of an 8-quinolinol platinum(II) chelate derivative and its efficient phosphorescence emission effected by inhibition of dioxygen quenching

A newly synthesized 8-quinolinol platinum(II) chelate derivative gelates various organic solvents, and the gel formed shows unique thermo- and solvatochromism of visible and phosphorescent colour in response to a sol-gel phase transition and possesses an attractive ability to inhibit dioxygen quenching of excited triplet states.     

Thin-film conducting polymers based on Ni(II), Pd(II), and Pt(II) complexes with 8-quinolinol

New thin polymeric films were prepared electrochemically on the basis of Ni(II), Pd(II), and Pt(II) complexes with 8-quinolinol, and conditions of synthesis were optimized. Basic characteristics of the films such as the thickness, charge transfer rate in the polymeric matrix, and photovoltaic effect were determined.     

Studies of the reactions of platinum halo complexes with tin(II) halides

The reaction of a dichloromethane solution of a mixture of cis,trans-[PtCl₂(SMe₂)₂] with a tetrahydrofuran solution of SnBr₂ resulted in oxidation of platinum(II) with halogen exchange producing cis,trans-[PtBr₄(SMe₂)₂]. Reaction of a mixture of cis,trans-[PtCl₂(SEt₂)₂], potassium tetrachloroplatinate(II) or potassium hexachloroplatinate(IV) with SnBr₂ in hydrochloric acid solution resulted in formation of predominantly anionic five-coordinate trichlorostannyl platinum(II) complexes. Reaction of potassium tetrabromoplatinate(II) with SnCl₂ in hydrobromic acid in the presence of tetraphenylphosphonium bromide affords cis-[PPh₄]₂[PtBr₂(SnBr₃)₂]. The insertion of SnCl₂ into Pt–Cl bond of platinum(II) complexes cis-[PtCl₂(L₂)] {L₂ = (PPh₃)₂; (PMe₃)₂; {P(OMe)₃}₂; dppm (bis(diphenylphosphino)methane); dppa (bis(diphenylphosphino)amine); and dppe (1,2-bis(diphenylphosphino)ethane)} is described.     

Complexes of palladium(II) and platinum(II) with 2-hydrazinopyridine and 8-hydrazinoquinoline

The square planar complexes cis-[MCl₂(hypy)], cis-[MCl₂(hyqu)], [Pt(hypy)₂] [PtCl₄], [Pd(hypy)₂][ClO₄]₂ and [Pd(hyqu)₂][ClO₄]₂ (M = Pd or Pt, hypy = 2-hydrazinopyridine, hyqu = 8-hydrazinoquinoline), in which hypy and hyqu act as bidentate chelating ligands, have been prepared and characterized. Complexes containing hyqu do not appear to have been isolated previously.     

Rearrangement of a (dithiolato)platinum(II) complex formed by reaction of cyclic disulfide 7,8-dithiabicyclo[4.2.1]nona-2,4-diene with a platinum(0) complex: oxidation of the rearranged (dithiolato)platinum(II) complex

Reaction of the title bicyclic disulfide 16 with [(Ph3P)2Pt(eta2-C2H4)] (2) yielded the corresponding (dithiolato)platinum(II) complex 17 by oxidative addition. The initial product 17 isomerized at room temperature in a [1,5]-sulfur rearrangement to give another (dithiolato)platinum(II) complex 18 in high isolated yield. Oxidation reactions of 18 with dimethyldioxirane (DMD) provided (sulfenato-thiolato)platinum(II) 23, (sulfinato-thiolato)platinum(II) 24, (sulfenato-sulfinato)platinum(II) 25, and (disulfinato)platinum(II) 26 complexes, the structures of which were elucidated by NMR spectroscopy and X-ray crystallography. The oxidation process took place regioselectively in the first step and chemoselectively in the second. The selectivities are discussed.     

Kinetic studies of ion-exchange of cobalt(II) and nickel(II) on a resin loaded with 5-sulpho-8-quinolinol

The mechanism of ion-exchange of cobalt(II) and nickel(II) on a resin loaded with 5-sulpho-8-quinolinol has been studied, and the chelate-forming reaction in the resin matrix shown to be rate-determining. The observed rate seems to be related to the rate of water-exchange with the metal ion in the aqueous phase, suggesting that complexation in the resin matrix may proceed according to the Eigen mechanism.     

Synthesis and characterization of a platinum(II) complex with N-acetyl-L-cysteine

Synthesis and spectroscopic studies in the solid-state of a platinum(II) complex with N-acetyl-L-cysteine are described. Elemental analyses are consistent with composition Pt₂(C₅H₈NO₃S)₄ · 3H₂O. Solid-state ¹³C NMR, infrared, and U-Vis spectroscopic results are consistent with coordination of the ligand to platinum(II) through sulfur. Thermal analyses confirmed water in the complex composition. Final residue of the thermal treatment was identified by powder X-ray diffractometry as metallic platinum.     

Extraction equilibrium of palladium(II) with 2-methyl-8-quinolinol into supercritical carbon dioxide fluid

The present study is concerned with the extraction behavior and equilibrium of Pd(II) with 2-methyl-8-quinolinol (HMQ) into supercritical fluid CO(2) (SF-CO(2)). Pd(II)-HMQ complex extracted from a weakly acidic solution (pH 2-3) into SF-CO(2) was determined to be Pd(MQ)(2) on the basis of a slope analysis. The extraction constant K(ex,SF) (=[Pd(MQ)(2)](SF)[H(+)](2)[Cl(-)](4)[PdCl(4)(2-)](-1)[HMQ](-2)) was determined to be 10(4.3+/-0.2) at 8.5 MPa, 45 degrees C and I=0.4 M (H,Na)Cl (1 M=1 mol dm(-3)). The distribution behavior of HMQ between an aqueous and a SF-CO(2) phase was examined so as to discuss quantitatively the extraction equilibrium. The extraction constant (K(ex,Cy)) of Pd(II) with HMQ into cyclohexane with a similar polarity to SF-CO(2) was determined and the K(ex,SF) was compared with the K(ex,Cy). Pd(II) at the concentration range of 10(-5)-10(-4) M in the aqueous solution (pH<3) containing relatively high concentration of chloride ion was found to be extracted efficiently by the SF-CO(2) extraction.     

Extraction of platinum with Astrafloxin FF from aqueous-organic solutions: Separative extraction-spectrophotometric determination of platinum(II) and platinum(IV) species

The optimum conditions of the extraction of the ion associates of platinum with the thiocyanate ions and the polymethine basic dye Astrafloxin FF by aromatic hydrocarbons and acetic acid esters from aqueous and aqueous-organic solutions were studied. The introduction of water-soluble donor-active solvents (hexamethylphosphoric triamide, N,N-diethylacetamide, N,N-dimethylformamide, and N,N-diethylformamide) leads to a considerable increase in the extraction of the ion associates of platinum and the simultaneous suppression of the extraction of the simple dye salt. The molar absorption coefficients of the extracts of ion associates are as high as (8.1?C13.3) × 10⁴. 84?C96% platinum is extracted in the form of ion associates by a single extraction. The conversion of platinum into ion associates makes it possible to separate platinum from many elements, including Cu, Cd, Ni, Co, Cr, Pb, In, Ag, Pd, Ir, Rh, and Ru, by extraction. In this case, platinum(II) is extracted in the form of ion associates under standard conditions, whereas platinum(IV) is extracted only after the preliminary thermal treatment of the test sample. A new procedure was developed for the extraction-spectrophotometric determination of the trace amounts of platinum(II) and platinum(IV), in particular, in their mixtures.     

Supercritical carbon dioxide extraction equilibrium of gallium(III) with 2-methyl-8-quinolinol and 2-methyl-5-butyloxymethyl-8-quinolinol

This work performed fundamental studies for the extraction of gallium(III) with 2-methyl-8-quinolinol (HMQ) and 2-methyl-5-butyloxymethyl-8-quinolinol (HMO(4)Q) into supercritical carbon dioxide (SF-CO(2)) from a weakly acidic solution. The distribution constants of HMO(4)Q between aqueous and SF-CO(2) phases were determined at 45 degrees C, 8.6-20.4 MPa and I=0.1 M (H, Na)NO(3) (M=mol dm(-3)). At 45 degrees C and 15.7 MPa, gallium(III) was hardly extracted with HMQ into SF-CO(2), but was quantitatively extracted with HMO(4)Q in the pH range of 2.20-2.84. The extraction constant, K(ex, SF-CO(2)) (=[Ga(OH)(MO(4)Q)(2)](SF-CO(2))[H(+)](3)[Ga(3+)](-1)[HMO(4)Q](SF-CO(2))(-2)), of gallium(III) with HMO(4)Q was determined to be 10(-2.6+/-0.1) at 45 degrees C, 15.7 MPa and I=0.1 M (H, Na)NO(3), which was 63 times larger than that in heptane at 45 degrees C and 0.10 MPa. It was also found that the addition of 3,5-dichlorophenol as a synergist enhanced the extractability of gallium(III) with HMO(4)Q into SF-CO(2).