Hexafluoro-antimonate

Antimonate, hexafluoro-, 3, 276 Antimonate, tris(cthyl dithioearbonate)-electron pair, 1, 37 Antimonates, 3, 265 Antimonic acids, 3, 265 Antimony, 3, 237-294 biology, 3,277 carcinogenicity, 3, 278 coordination number, 3, 256 determination... 

Antimonates, hexafluoro-, 276 Antimonic adds, 265 Antimony, 237-294 biology, 277 cardnogenidty, 278 coordination number, 256 electronic structure, 256 in medidne, 278 pharmacology, 278 teratogenidty, 278 toxicology, 277... 

As mentioned above, the conventional diazonium salts have good optical properties as CEL dyes and negative working sensitizers for the two-layer resist system. However, almost all diazonium salts are stabilized with metal-containing compounds such as zinc chloride, tetrafluoroborate, hexafluoro-antimonate, hexafluoroarsenate, or hexafluorophosphate, which may not be desirable in semiconductor fabrication because of potential device contamination. To alleviate the potential problem, new metal-free materials have been sought for. 

They had also found that t-butyloxocarbonium (pivalyl) hexafluoro-antimonate easily loses carbon monoxide in sulphur dioxide solution even at low temperature, and a new, electron-deflcient species, the trimethylcarbonium ion, is formed... 

The possibility of obtaining stable alkylcarbonium hexafluoro-antimonate salts by interaction of alkyl fluorides with antimony pentafluoride (neat or in sulphur dioxide and later in sulphuryl fluoride or sulphuryl chloride fluoride solution) was then evaluated in detail, extending the investigations to all isomeric C3-, C4-, C5- alkyl fluorides. 

JT-Ray powder photographs of the oxyfluoride have been indexed on the basis of a cubic unit cell, a = 10 032 0 002 k, U = 1010 A, /) = 4-20 (by CCI4 displacement), Z = Dc = 4-48. The powder photograph shows a close resemblance to that of nitrosyl hexafluoro-osmate(v), NOOsF, a = 10-12 k, Z = 8, U = 1038 A, which has been prepared recently in this laboratory. Both patterns closely resemble that of potassium hexafluoro-antimonate(v), KSbF, a = 10-15, Z = 8, (/ = 1046 A, the structure of which has been described by Bode and Voss. ... 

As the nitrosyl ion, NO, is similar in size and shape to the dioxygenyl ion, a resemblance of the dioxygenyl hexafluoroplatinate(v) diffraction patterns to those of nitrosyl hexafluoro-osmate(v), -ruthenate(v), and -antimonate(v) is expected. Moreover, since the first ionisation energy of the nitric oxide molecule is 62 kcal. mole lower than that of oxygen, nitrosyl salts are not uncommon. From the unit-cell sizes and molar... 

Of course several formulations are possible for the compound. Fortuntely the solid gave a simple X-ray powder diffraction photograph which was indexed on the basis of a cubic unit cell, a = 10.032A. The compound was apparently structurally similar to potassium hexafluoro-antimonate (V) the structure of which had been given by Bode and Voss Furthermore we found that nitro-syl hexafluoro-osmate (V) and nitrosyl hexafluoro-anti-monate (V) were also isomorphous with the compound. Figure 4 shows the close resemblance of the X-ray powder... 

SuFi,IjSbi2AsF, cyc/o-heptasulfur(3-H), p-iodo-bis(4-iodo-, tris hexafluoro-antimonate( I -))— 2(arsenic trifluo-ride), 27 335... 

One of us with Franta et al.162) used methacryloyl chloride and silver hexafluoro-antimonate to initiate the polymerization of THF with subsequent termination with sodium phenolate ... 

For the methoxydiazonium ion (H3CO—Nj ), Olah et al. (1986) methylated dinitrogen oxide at the O-atom with methyl fluoride and SbF5 in SO2F2, or with CH3O+ —SOCIF —SbFg" in SO2CIF at — 80°C. The methoxydiazonium hexafluoro-antimonate precipitates and can be dissolved in methyl fluoride. 

As an example, when the photoacid generator triphenylsulfonium hexafluoro-antimonate is exposed to radiation, it decomposes to release the superacid hexafluoroantimonic acid in the resist film. While this photochemical reaction can occur at room temperature, the acid-catalyzed deprotection of the pendant t-butyl group of the resist polymer occurs at reasonable rates only at elevated temperature. It is therefore necessary to heat the resist film to an appropriate temperature (PEB) to provide the energy that is required for the acid-catalyzed deprotection of the t-butyl group of the ester, which in mrn affords the base-soluble norbomene carboxylic acid unit the isobutylene volatilizes. The extent of deprotection at constant temperamre is dependent on the dose of applied radiation. By monitoring the carboxylic acid OH stretch 3000-3600 cm and the ester carbonyl (C O) around 1735 cm acid carbonyl (C O) around 1705 cm , and ester (C-O-C) stretch around 1150 cm it is possible to determine by means of IR spectroscopy the extent of dose-dependent deprotection, as well as the influence of baking temperature on the extent of deprotection for each resist system. Doses ranging from 0 to 50 mJ/cm were applied to each resist system, after which they were baked at 120, 130, 140, and 150°C for 60 seconds and analyzed by FTIR. ... 

FgFe205PC,(,H,j, lron(l+), p-acetyl-C 0-bis dicarbonyl(ri-cyclopentadienyl)-, hexafluorophosphatefl—), 26 235 FgISjSb, Antimonate(l-), hexafluoro-, iodo-cyc/o-heptasulfur(l+), 21222 FgIi07P2S2C3,Hj Iridium(lII), caibonyl-... 

I2S1JUC22H42, UraniumaV), bis(ii -l,3-bis(trimethylsilyl)cyclopenta-dienyljdiiodo-, 27 176 IjYb, Ytterbium diiodide, 27 147 IjF gS,4Sb3 2AsF3, cyc/o-heptasulfur(3+), p-iodo-bis(4-iodo-, tris[hexafluoro-antimonate(l—) —2(arsenic trifluoride), 27 335 IjNCigHjg, Ammonium, tetrabutyl-, (triiodide), 29 42... 

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