Platinum optical properties

The metal-metal interaction and conductivity increase with pressure using bulkier ammines increases the Pt-Pt distance. Although palladium-containing ions can be substituted for the platinum species, the optical properties and metal-metal interaction causing pronounced dichroism are... 

The localized-valence halogen-bridged platinum(II)/platinum(IV) complexes (175) are of interest because of their highly anisotropic electrical and optical properties. The complexes are characterized by broad and intense intervalence bands in their electronic spectra.542 Partial oxidation of [PtCl(dien)]Cl with iodine yields the mixed valence species [PtI(dien)][PtI3(dien)]I2,543 but when 4Me-dien is used, the mixed valence compound is only obtained if it is trapped quickly, before isomerization of the meridional platinum(IV) complex to a facial form.544 Although these species nominally have localized valences, the extent of delocalization increases as the bridging halide... 

It is insoluble in water, microcrystallinc, and lilac in colour.1 Many of these derivatives of platinum containing organic bases have been obtained in optically active forms. Those containing 1-propylene-diamine will serve as examples. These are easily prepared, and as they are remarkably stable are easily examined for optical properties. The compounds are prepared by the interaction of cis-dichloro-l-propylenc-diamino-platinum, [Pt pnCl2], with the calculated quantity of the corresponding base, 1-propylcnediamine, ammonia, ethylenediamine, or trimethylenediamine. The liquid obtained is evaporated on a water-bath and precipitated with alcohol. The di-derivative of 1-propylene-diamine, [Pt pns]Cla, has rotation [a]o+46-37°, [M]r>+192-0°. 

Optical Properties.—The refractive index of tantalum is 2-05, the coefficient of absorption 2-31, and the reflexion capacity 43-8 per cent, when measured with yellow light of wave-length A=5790.5 The spectral emissivity and the radiation intensity and their variation with temperature have been measured by Worthing.6 For a comparison of the radiation constants of tantalum, platinum, osmium and carbon, see the references cited.7 The flame spectrum of tantalum between carbon electrodes consists of a blue cone with a reddish-yellow edge.8... 

Optical Properties and Photophysics of Platinum-Containing Poly(aryleneethynylene)s... 

Gold received much attention due to their unique size-dependent optical properties, insolubility in nitric acid and resistance to heat, moisture, oxygen and most corrosive reagents. For substrates in surface-enhanced Raman Spectroscopy (SERS), ergonomic electronic contacts, ultra fast data communication and biomedicine surface modified gold nanoparticles are perspective agents, while in the industry of catalysis platinum nanoparticles (Pt NPs) exhibiting excellent anticorrosive and catalytic properties are usually employed. 

It may be worthwhile to point out that the term abnormal infrared effects refers to the phenomenon of different spectral properties of adsorbates at thin film electrodes in comparison with those at massive metal electrodes. The origin of the AIREs relates certainly to the particular properties of thin film material and the interaction of adsorbates with the nanometer-scale thin film. A change in optical properties of the adsorbate-thin film system may be consequently expected. Bjerke et al. [21] have simulated the variation of IR features of CO adsorption on platinized platinum electrodes, which may have thrown a light on interpreting the phenomenon. However, thoroughly understanding the origin of the AIREs is yet... 

Bimetallic nanoparticles are of wide interest since they lead to many interesting size-dependent electrical, chemical, and optical properties [1]. They are particularly important in the field of catalysis since they often exhibit better catalytic properties than their monometallic counterparts [2-6]. Gold is very useful as an alloying metal and it has been used in conjunction with metals such as palladium [1,3,4,7-11] and platinum [6,10,11,20-24] for various catalytic reactions. The structure of bimetallic combinations depends mainly on the preparation conditions and the miscibility of the two components. Among the bimetallics, Au-Pd is one of the combinations that has been extensively studied in terms of preparation, stabilisation, and catalytic activity. Particularly, the use of preformed metallic sol as precursor of heterogeneous catalysts apparently shows the more tuneable method for preparing bimetallic particle. Turkevich and Kim have studied the morphology of Au-Pd bimetallic particles, prepared... 

Optical Crystallographic Properties. As prepared by the thermal decomposition of ammonium hexafluorovanadate-(III), vanadium(III) fluoride has too fine a crystal size for the determination of optical properties with a polarizing microscope. Heating to 1350° in a platinum tube forms twinned crystals that are easily studied. According to Weaver, these crystals are biaxial (y=-) with optic angle (2V) of 5 to 10°. The a- and y-refractive indexes are, respectively, 1.536 and 1.544. 

Platinates, bis(oxalato)-, 139 cadmium complexes superstructure, 142 cobalt complexes, 140 electrical conductivity, 14] superstructure, 141 thermopower, 141 divalent cation salts, 140 iron complexes structure, 142 lead complexes superstructure, 142 magnesium complexes, 140 electrical conduction, 142 structure, 142 thermopower, 142 modulated superstructure, 139 monovalent cation salts, 139 nickel complexes structure, 141 partially oxidized, 139 Platinates, tetracyano-, 136 anion-deficient salts, 136 electrical conduction, 138 optical properties, 138 cation-deficient salts, 138 oxidation states, 136 partially oxidized, 138 semiconductors, 134 Platinum colloidal... 

There is now sufficient evidence to validate, in principle, the long-held expectation that metallic SWNTs may ultimately be used in transparent electrodes, or at least as alternatives to the ITO technology. In practice, many technical issues from materials (separated metallic SWNTs) to fabrication have yet to be fully addressed. Beyond transparent electrodes, metallic SWNTs may find other applications in which extremely high electrical conductivity and excellent optical properties are both required, or even some in which optical transparency is not necessary. Again for DSSCs, as an example, great benefits for using metallic SWNTs to replace the presently used platinum metal in the cathode may be expected on the basis of available experimental results. " ... 

Uses Encapsulant, molding and coating compd. tor electronic devices, optical devices, supported membranes Features Filler-tree high optical transmission relatively low vise. extended pot life flexible RTV vinyl-addition (platinum) curing Properties Vise. 1750-2500 cSt (1 1 catalyzed) Cured props. ret. index 1.407 tens. str. > 300 psi elong. 140-200% tear str. 5-15 pli hardness (Shore A) 15-30 Gelest OE 42 [Gelest]... 

Platinum polyynes represent one of the most interesting and well-studied classes of linear metallopolymers (Chapters, Section 5.2). Dendritic analogues of these materials have been prepared by a variety of methodologies [94—96]. One example is the nonametallic dendrimer 8.43, which was prepared by a convergent route as illustrated in Eq. 8.9 [94]. Dendrimers based on ruthenium polyyne architectures have also been prepared, and promising nonlinear optical properties have been identified [97, 98]. 

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