- Synthesis and Properties of a Methyl Derivative of Zeise's Dimer
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A methyl(ethylene)platinum(II) complex has been prepared and characterized; it forms complexes where L = pyridine, Me2S, or C2H4, undergoes exchange with unsaturated reagents (un) where (un) = PhCH=CHPh, CH(CO2Me)=CH(CO2Me), or PhCCPh to give , undergoes insertion with CF3CCCF3 to give, after treatment with pyridine, (py)2>, and reacts with Zeise's dimer to give the unsymmetrical dimer .
- Scott, John D.,Puddephatt, Richard J.
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- A matrix isolation and DFT study of the generation and characterization of monomeric vapour phase platinum chlorides
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Molecular platinum monochloride (PtCl) and platinum dichloride (PtCl2) have been prepared from platinum atoms and chlorine doped argon in a hollow-cathode sputtering device, matrix isolated in solid argon and characterized using electronic, infrared and X-ray absorption spectroscopies together with high level DFT calculations.
- Bridgeman, Adam J.,Cavigliasso, Germán,Harris, Neil,Young, Nigel A.
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- Reaction of PtCl4 with 18-crown-6 in aprotic solvents (Nitromethane, acetonitrile, and 1,2-dichloroethane)
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Specific features of the reaction of anhydrous PtCl4 with 18-crown-6 in anhydrous solvents with different donor and solvating abilities, such as nitromethane, acetonitrile, and 1,2-dichloroethane, under an inert atmosphere are studied. Ionic pl
- Guseva,Khasanshin,Zinkicheva,Yarkova,Polovnyak
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- Synthesis, physico-chemical characterization and bacteriostatic study of Pt complexes with substituted amine ligands
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Three complexes of general formula PtCl2R2 were synthesized, where R is the amine ligand with aromatic substituents. Coordination compounds [Pt(an)2Cl2] (1), [Pt(pa)2Cl2] (2) and [Pt(aph)s
- Barta Holló,Szilágyi,Várhelyi, Cs.,Hunyadi,Nagy,Tihi,Goga,Papp,Szalay,Pokol
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- Thermodynamic properties of α-platinum dichloride
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The heat capacity of crystalline α-platinum dichloride was measured for the first time in the temperature intervals from 11 to 300 K (vacuum adiabatic microcalorimeter) and from 300 to 620 K (differential scanning calorimetry). In the 300-620 K temperatur
- Semenova,Chusova
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- Thermodynamic characteristics of thermal dissociation of platinum dichloride
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The dissociation pressure for the process PtCl2(s) → Pt(s) + Cl2(g) was measured by the static method with diaphragm zero-pressure gauges. The approximating equation for the temperature dependence on the dissociation pressure for the
- Semenova,Chusova,Titov
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- Physicochemical investigation of platinum dichloride polymorphism
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The physicochemical characteristics of phase transitions of PtCl2 were investigated for the first time. The irreversible character of the transition from β-modification to α-form of PtCl2 and the temperature range of process were est
- Chusova, Tamara P.,Semenova, Zinaida I.
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- Thermodynamics of the Pt-Cl system
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Using a static method three individual compounds in system of Pt-Cl: PtCl4, PtCl3, and PtCl2 are shown to exist. PtCl was shown not to exist. The enthalpies of formation of platinum chlorides were measured by calorimetry by reduction of the compounds with gaseous hydrogen. The recommended values for the enthalpies of formation at 298.15 K are -137.7 ± 0.3, 194.2 ± 1.0, and 245.6 ± 1.9 kJ/mol for PtCl2(s), PtCl3(s) and PtCl4(s), respectively.
- Chusova, Tamara P.,Semenova, Zinaida I.
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- Structure and bonding of the hexameric platinum(II) dichloride, Pt6Cl12 (β-PtCl2)
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The crystal structure of Pt6Cl12 (β-PtCl2) was redetermined (R3m ah = 13.126 A, ch = 8.666 A, Z = 3; arh = 8.110 A, α = 108.04°; 367 hkl, R = 0.032). As has been shown earlier, the structure is in principle a hierarchical variant of the cubic structure type of tungsten (bcc), which atoms are replaced by the hexameric Pt6Cl12 molecules. Due to the 60° rotation of the cuboctahedral clusters about one of the trigonal axes, the symmetry is reduced from Im3m to R3m (I3m). The molecule Pt6Cl12 shows the (trigonally elongated) structure of the classic M6X12 cluster compounds with (distorted) square-planar PtCl4 fragments, however without metal-metal bonds. The Pt atoms are shifted outside the Cl12 cuboctahedron by Δ = +0.046 A (d(Pt-Cl) = 2.315 A; d(Pt-Pt) = 3.339 A). The scalar relativistic DFT calculations results in the full m3m symmetry for the optimized structure of the isolated molecule with d(Pt-Cl) = 2.381 A, d(Pt-Pt) = 3.468 A and Δ = +0.072 A. The electron distribution of the Pt-Pt antibonding HOMO exhibits an outwards-directed asymmetry perpendicular to the PtCl4 fragments, that plays the decisive role for the cluster packing in the crystal. A comparative study of the Electron Localization Function with the hypothetical trans-(Nb2Zr4)Cl12 molecule shows the distinct differences between Pt6Cl12 and clusters with metal-metal bonding. Due to the characteristic electronic structure, the crystal structure of Pt6Cl12 in space group R3m is an optimal one, which results from comparison with rhombohedral Zr6I12 and a cubic bcc arrangement.
- Von Schnering, Hans Georg,Chang, Jen-Hui,Peters, Karl,Peters, Eva-Maria,Wagner, Frank R.,Grin, Yuri,Thiele, Gerhard
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p. 516 - 522
(2008/10/08)
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- Variety in the coordination modes of the ligand hexakis(pyrazol-1-yl)benzene (Hpzb) to PdII, PtII and CuI centres
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The structure and conformational analysis of eight complexes derived from hexakis(pyrazol-1-yl)benzene (hpzb) have been carried out by means of X-ray crystallography and NMR spectroscopy. The metallic fragments [Pd(C6F5)2,
- Guerrero, Ana M.,Jalon, Felix A.,Manzano, Blanca R.,Claramunt, Rosa M.,Santa Maria, Maria Dolores,Escolastico, Consuelo,Elguero, Jose,Rodriguez, Ana M.,Maestro, Miguel A.,Mahia, Jose
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p. 3178 - 3189
(2007/10/03)
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- New routes to the synthesis of chloro-carbonyls of palladium(II) and platinum(II)
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[Pt(CO)x]n (x～2), the already described species obtained by the reaction of platinum(0) olefin complexes with carbon monoxide, reacts promptly at room temperature with SO2Cl2 under CO affording cis-PtCl2/s
- Belli Dell'Amico, Daniela,Labella, Luca
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p. 427 - 430
(2007/10/03)
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- INTERACTION OF BORON TRIFLUORIDE ADDUCTS WITH PLATINUM(II) COMPLEXES (NEW METHOD FOR OBTAINING beta -PtCl2 AND CLATHRATES BASED ON beta -PtCl2).
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The objective in this work is to develop a simple, rapid method for the preparation of PtCl//2 from the compound K//2 left bracket PtCl//4 right bracket . Experimental results show that the yield of platinum(II) chloride amounts to 200 mg per g of K//2 left bracket PtCl//4 right bracket ; however, it should be noted that the authors occasionally observed complete dissolution of the brown precipitate without any recovery of PtCl//2. This phenomenon may be related to the formation of water-soluble clathrates based on beta -PtCl//2, and it also may be related to various processes of replacement of chloride ligands in the left bracket PtCl//4 right bracket **2** minus anion in the H//2SO//4/H//2O system.
- Vorob'ev-Desyatovskii,Smorodina,Paramonov,Postnikova,Sibirskaya,Marchenko,Kukushkin
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p. 891 - 897
(2008/10/08)
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- Process for producing p-xylene
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In a process for producing p-xylene which comprises catalytically methylating toluene with a methylating agent in the gaseous phase, the improvement wherein (a) said methylation is carried out continuously in a multi-stage reaction system consisting of a plurality of separate series-connected fixed catalyst layers without separating the resulting xylenes in an intermediate stage, (b) said toluene is fed together with hydrogen gas into only the first-stage fixed catalyst layer and passed successively through the subsequent fixed catalyst layers, the amount of toluene fed being such that the total weight hourly space velocity of toluene is from 1 to 300 hr-1, (c) said methylating agent is fed into each of said fixed catalyst layers, if desired together with hydrogen gas, the amount of the methylating agent fed into each catalyst layer being 0.01/t moles to 1/t moles, in which t is the number of methyl groups in the methylating agent, per mole of toluene fed into the first-stage catalyst layer, and the total amount of the methylating agent fed into all of the catalyst layers being within the range of 0.1/t moles to 2/t moles, in which t is as defined, per mole of toluene fed into the first-stage catalyst layer, and (d) each fixed catalyst layer is filled with a catalyst composed of a crystalline aluminosilicate containing magnesium oxide or lanthanide oxide.
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- Synthesis and properties of platinum metal oxides of the type MxPt3O4
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Methods were developed for high-yield syntheses of MxPt3O4 where M = Li, Na, Mg, Ca, Zn, Cd, Co, and Ni. A new technique involving reaction of a mixture of nitrates and fluorides with PtO2 gives 60-95% yields based on PtO2. Another efficient and novel technique is vapor-phase hydrolysis of chloride mixtures. This method produces samples with surface areas of 10-40 m2/g and has yielded the compositions HxPt3O4-yCly and NixPt3O4-yCly, probably the first example of the introduction of H and Cl into the MxPt3O4 lattice. Plots of a vs. x are linear for NaxPt3O4 and parabolic for CdxPt3O4 while plots of a vs. percent Co, Ni, or Mg are linear for CoxNayPt3O4, NixNayPt3O4, and MgxNayPt3O4, respectively. Magnetic susceptibility and XPS data on CoxPt3O4 and NixPt3O4 suggest the presence of Co2+ and Ni2+. Metallic conductivity in NaPt3O4, Ni0.25Pt3O4, and Li0.8Pt3O4 is consistent with short Pt-Pt bonds in the MxPt3O4 structure and conflicts with recent claims of semiconducting behavior. LixPt3O4, CoxPt3O4, and NixPt3O4 have high O2 reduction activity and voltammetric properties similar to those of Pt3O4 electrodes.
- Shannon,Gier,Carcia,Bierstedt,Flippen,Vega
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p. 3372 - 3382
(2008/10/08)
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