Elemental silicon and solid SiO give the same products as SiO2 upon reaction with alkali-metal glycolates

Donhärl, Wolfgang; Elhofer, Ines; Wiede, Petra; Schubert, Ulrich

doi:10.1039/a803672a

Cited by 20 publications

(8 citation statements)

References 9 publications

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“…It has been shown that glycols can complex with silica . Alkali cations in solution, such as sodium, bridge the anionic silicate ions of these complexes, holding sodium and silica in a certain spatial orientation with each other . As iron ions were freed from the magnetite surface, the silica–sodium–1,4‐BD complex may have coordinated with them, or simply having all three components in close proximity could be enough to have overcome the barriers to acmite formation.…”

Section: Discussionmentioning

confidence: 99%

Solvothermal Synthesis of Acmite Conversion Coatings on Steel

et al. 2013

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Acmite (NaFeSi 2 O 6 ) films were formed on steel coupons via solvothermal reaction of silica, sodium hydroxide, and 1, 4-butanediol in an autoclave under autogenous pressure. Systematic variation in processing variables led to homogenous coatings comprised of pinacoidal acmite grains with an average grain size of~33 lm. The coatings were produced on the steel coupons from reactant conditions of 0.635 m SiO 2 , 2.546 m NaOH, and 3.087 m 1,4-butanediol for 72 h at 240°C.

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Section: Discussionmentioning

confidence: 99%

Solvothermal Synthesis of Acmite Conversion Coatings on Steel

et al. 2013

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“…Compound 34 features the ¢rst structurally characterised Sn(II)^Sn(IV) bond. 66 For complexes of general formula Sn 2 R 4 , where R 2-Bu t -4,5,6-(Me) 3 C 6 H, 119 Sn NMR in the solid state reveals a single dimeric species but in solution a monomer^dimer equilibrium mixture. 67 The synthesis and crystal structure of (THF) 3 Na[(Sn-2,6-(Pr i ) 2 C 6 H 3 ) 2 ] from sodium anthracenide and Sn(Cl), (2,6-(Pr i ) 2 C 6 H 3 ) has been reported, with the product exhibiting Sn^Sn 2.8107, NaÁÁÁSn 3.240 Ð.…”

Section: Scheme 11mentioning

confidence: 99%

“…For ML n Fp, the structure has Fc^C 3 1.913^1.919 Ð and the carbon triangle is almost equilateral with C^C 1.375^1.394 Ð. 25 In an extensive investigation of M( 14) NMR behaviour (M(14) element of group 14), the chemically simple species M(SnMe 3 ) 4 (M C 19, Si 20, Ge 21 or Sn 22) and M(Me) 2 (SnMe 3 ) 2 (M C 19a, Si 20a, Ge 21a or Sn 22a) were investigated by 1 H, 13 C, 29 Si, 73 Ge and 119 Sn NMR. From this, 1 J 119 Sn^M was found to be b0 for all compounds prepared, for 19^22a 2 J 119 Sn^M^1 19 Sn are `0 and for 22a b0, and for 19a^22a all geminal couplings are b0.…”

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confidence: 99%

5 Carbon, silicon, germanium, tin and lead

Parr

2000

Annu. Rep. Prog. Chem., Sect. A

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A number of review articles relevant to this chapter have appeared. The area of carbon-rich ligands has been the subject of two timely publications, a special issue of the Journal of Organometallic Chemistry 1 on carbon-rich organometallic complexes and a complementary review on cumulenylidenes. 2 The catalytic applications of metal vinylidenes 3 and the occurrence of planar carbon in organometallic complexes of group 4 and 5 elements 4 have also been reviewed. For silicon, reviews have been in the area of the formation of monolayers 5 and the chemical processing of silicon wafers. 6 A review discussing the role of p-block elements, largely tin, in determining the structure of heterometallic complexes has been published. 7 Despite the discovery of fullerenes, the newest allotrope of carbon, much interest remains in one of the older examples, diamond. The reaction of carbon tetrachloride with four equivalents of sodium metal at 973 K in the presence of a Co/Ni catalyst yields C dia . The product, identi¢ed by Raman spectroscopy, is formed as a powder in a low (ca. 2%) yield, but nevertheless this is amongst the lowest energy routes to industrial diamonds yet known. 8 The same product can be prepared using conditions designed to mimic those found on Uranus and Neptune in which methane is heated to (2^3) Â 10 3 K at pressures of 10^50 gigapascals, whereupon the methane breaks down to form diamond and polymeric hydrocarbons. 9 A convincing argument has been presented for the formation of such a dense solid from a light gaseous phase contributing to the internal heat, magnetic ¢eld and luminosity of a celestial body, and hence the possible signi¢cance of this process in planet formation. A report of the synthesis and identi¢cation of C 6 CH 2 as :C( C C) 2 C CH 2 by removal of the charge from the C 6 CH 2 À. radical anion during neutralisationreionisation mass spectroscopy has been published and related to the cumulenes found in circumstellar dust. 10 Cumulene complexes of transition metals continue to attract much attention. Although synthetic protocols are well established, some new approaches have appeared outlined in Scheme 1. 11,12 The last compound shown is a very rare example of a linear ten atom chain C 8 Rh 2 . Cumulenes with extremely long carbon chains have also appeared, such as 3 which shows in the solid state a distinct twisting of the C 12 chain away from linear, 13 and 4 and 5 (Scheme 2). The crystal structure of 5 shows C^C bond lengths of 1.210^1.233 Ð for triple bonds

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“…It is only known that silicon monoxide is easily oxidized [16,17], reacts with aqueous HF to Si and polysilanes [18], it is degraded by alkaline glycolates to pentacoordinated silicon compounds [19] and reduced by Mg to MgSi 2 [13].…”

Section: Introductionmentioning

confidence: 99%