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1Author    Valerie Bertagna, Francis Rouelle, Marius ChemlaRequires cookie*
 Title    Copper Contamination Mechanism of Silicon Substrates from HF Solutions  
 Abstract    The contamination of silicon wafers from dilute HF solutions containing ultratrace levels of metallic ion impurities is a subject of constant interest. The mechanism of copper electroless deposition from HF onto monocrystalline silicon was investigated using a new electrochemical cell, which proved to be a very sensitive detector for in situ characterization of silicon surfaces. Upon addition of copper trace amounts, the open-circuit potential was observed to shift rapidly towards more positive values at a rate nearly proportional to the copper concentration. All poten-tial/time curves tend to reach a limiting value of the potential, while quantitative measurements of radioactive tracers revealed that during a few tens of minutes, copper ions were continuously reduced on the silicon surface. Electrochemical potentials and voltammetric measurements were interpreted in terms of the mixed potential theory and led to the conclusion that copper nuclei act as a catalyst which enhances the cathodic activity for protons reduction. The model was supported by AFM observations which demonstrated the initiation of corrosion pits around the nuclei. 
  Reference    Z. Naturforsch. 52a, 465—176 (1997); received April 14 1997 
  Published    1997 
  Keywords    Silicon, contamination, copper, catalysis 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0465.pdf 
 Identifier    ZNA-1997-52a-0465 
 Volume    52 
2Author    Uwe Klingebiel, Mathias Noltemeyer, Hans-Jörg RakebrandtRequires cookie*
 Title    Difluorphosphorylcyclosilazane -Synthese und Kristallstruktur Difluorophosphorylcyclosilazanes -Syntheses and Crystal Structure  
 Abstract    The reaction of lithiated l,3-bis(fluorodimethyl)cyclotrisilazane with PF3 leads to the formation of a PF2-substituted six-membered Si-N ring (1). 1,5-Bis(difluorophosphanyl)-2,2,4,4,6,6,8,8-octamethyl-cyclotetrasilazane (2) is obtained in the reaction of the dilithium derivative of the cyclic tetrasilazane with trifluorophosphane in a molar ratio 1:2. The crystal structure of (F2P-N-SiMe2-NH-SiMe2)2 (2) has been determined. 
  Reference    Z. Naturforsch. 52b, 775—777 (1997); eingegangen am 14. April 1997 
  Published    1997 
  Keywords    Fluorophosphorylcyclosilazanes, Silicon, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0775.pdf 
 Identifier    ZNB-1997-52b-0775 
 Volume    52 
3Author    Uwe Klingebiel, Brigitte Tecklenburg, Mathias Noltemeyer, Dieter Schmidt-Bäse, Regine Herbst-IrmerRequires cookie*
 Title    Cyclodisilazane in cis-Konformation -eine einfache Synthese Cyclodisilazanes in cis Conformation -a Facile Synthesis  
 Abstract    Dilithium derivatives of bis(silylamino)fluorosilanes (1-3) react with chlorotrimethylsilane to give dilithium derivatives of the corresponding bis(silylamino)chlorosilanes and Me3SiF. LiCl-elimination in the presence of THF leads to the formation of silaamidides, which are 
  Reference    Z. Naturforsch. 53b, 355—360 (1998); eingegangen am 14. Januar 1998 
  Published    1998 
  Keywords    Silicon, Lithium, Silylamide, Silaamidide, Cyclodisilazane 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0355.pdf 
 Identifier    ZNB-1998-53b-0355 
 Volume    53 
4Author    Karl Hensena, Ralf Mayr-Steina, Björn Spangenberg3, Michael Bolteb, Stephan RühlbRequires cookie*
 Title    Komplexe gemischter Siliciumhalogenide mit 3,4-Lutidin Complexes o f M ixed Silicon Halides with 3,4-Lutidine  
 Abstract    The first single crystal X-ray investigations of 3,4-lutidine complexes with mixed silicon tetrahalides were carried out. 
  Reference    Z. Naturforsch. 55b, 248—252 (2000); eingegangen am 22. November 1999 
  Published    2000 
  Keywords    Coordination Chemistry, Halogen Exchange, Silicon 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0248.pdf 
 Identifier    ZNB-2000-55b-0248 
 Volume    55 
5Author    HerbertW. Roesky, Klaus AmbrosiusRequires cookie*
 Title    Über Reaktionen von 3-trifluormethylphenylsubstituierten silicium-und zinnorganischen Verbindungen Reactions of 3-Trifluoromethylphenyl Substituted Silicon and Tin Organic Compounds  
 Abstract    Several routes were investigated for the preparation of 3-CF3C6H4N[Si(CH3)3]2 2 and 3-CF3C6H4N[Sn(CH3)3]2 3. The latter compound reacts with 3-CF3C6H4NCO to yield [3-CF3C6H4(CH3)3SnN]2CO 4. A substituted urea 5 is also formed from [(CH3)3Si]2NCH3 and 3-CF3C6H4NCO. 5 is used for the preparation of cyclic compounds, with S2CI2 the ten-membered ring (3-CF3C6H4NCONCH3S2)2 6 is formed. 5 and HN(S02C1)2 yield the six-membered ring 3-CF3C6H4NC0NCH3(S02)2NH 7. SeOCl2 and 5 react under formation of a spiro compound (S-CFsCeHjNCONCHs^Se 8. The compounds were characterized on the basis of mass and 19 F NMR spectra. Am Beispiel des CF3S02N[Sn(CH3)3]2 und seiner 
  Reference    Z. Naturforsch. 33b, 759—762 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    Fluoro Compounds, Cycles, Silicon, Tin, Metal Organic Derivatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0759.pdf 
 Identifier    ZNB-1978-33b-0759 
 Volume    33 
6Author    E. Klüver, Hk Müller-BuschbaumRequires cookie*
 Title    Uber einen Lanthanoid-Mangan-Apatit: Nd4M n(Si04)30 On a Lanthanoid Manganese Apatite: Nd4M n(S i04)30  
 Abstract    Single crystals of Nd4M n (S i0 4)30 have been prepared by a Bi20 3 flux in closed copper tubes. The colourless crystals show hexagonal symmetry, space group C |h-P 6 3/m, a -9,4986(9), c = 6,944(2) A, Z = 2. Nd4M n (S i0 4)30 crystallizes in the A patite structure and shows Nd3+ and Mn2+ with partly statistical distribution. A s a consequence of this, 0 (2) and 0 (4) are occupying split positions. 
  Reference    (Z. Naturforsch. 50b, 61 [1995]; eingegangen am 25. Juli 1994) 
  Published    1995 
  Keywords    Neodymium, Manganese, Silicon, Apatite, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0061.pdf 
 Identifier    ZNB-1995-50b-0061 
 Volume    50 
7Author    Max Herberhold, Silke Gerstmann, Bernd WrackmeyerRequires cookie*
 Title    Tetrakis(sulfurdiimido)silane, -germane and -stannane  
 Abstract    Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 1 l9Sn CP/MAS NMR. Whereas la,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of la by using one, two, three or four equivalents of K[(NSN)rBu] led to mixtures of la with Cl3Si(NSNrBu) 4a, Cl2Si(NSN/Bu)2 5a, and ClSi(NSNfBu)3 6a. Only one sulfurdiimido ligand of the silane la reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds. 
  Reference    Z. Naturforsch. 53b, 573—580 (1998); received March 30 1998 
  Published    1998 
  Keywords    Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0573.pdf 
 Identifier    ZNB-1998-53b-0573 
 Volume    53 
8Author    B. Wedelb, K. Sugiyama3, K. Hiraga3, K. ItagakibRequires cookie*
 Title    Zur Kristallchemie des ersten Blei-Zink-Silicium-Telluroxids: PbZn4SiTeOio On the Crystal Chemistry o f the First Lead Zinc Silicon Tellurium Oxyde PbZn4SiTeO 10  
 Abstract    Single crystals of the new lead zinc silicon tellurium oxide PbZn4SiTeO10 have been prepared by solid state reaction in air. The compound is colourless and crystallizes in orthorhombic symmetryj space group Dih Pnma, with the cell parameters: a = 6.542 (5), b = 15.624(4), c = 8.280(4) A, Z = 4. The structure has been determined from a single crystal X-ray study and refined to the conventional values R = 0.032 and wR(F2) = 0.050. Zn~+ and Si4+ show tetrahedral and Te6+ octahedral coordination by 0 2~.The crystal structure is dominated by a ^ [Zn4O l0]12-framework with isolated Te066+ and Si044+ polyhedra. Pb2+ ions are incorporated in the network. The centres of negative charge of the lone of the Coulomb term of the lattice energy. 
  Reference    Z. Naturforsch. 54b, 469—472 (1999); eingegangen am 3. Dezember 1998 
  Published    1999 
  Keywords    Lead, Zinc, Silicon, Tellurium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0469.pdf 
 Identifier    ZNB-1999-54b-0469 
 Volume    54 
9Author    Nils Wiberg, Hans-Wolfram Lemer, Susanne Wagner, Heinrich Nöth+, Thomas Seifert+Requires cookie*
 Title    On an Octastannanediide R*6Sn8[Na(THF)2]2 and the Possible Existence of an Octastannane R*6Sn8 [ 1 ]  
 Abstract    The black, air and moisture sensitive octastannanediide R*6Sn8[Na(THF)2]2 (4) (R* = Si/Bu3) is prepared by reaction of Sn[N(SiM e3)2]2 with R*Na in rBuOMe at -78°C . Red brown octa­ stannane R*6Sn8 (5) is formed by thermolysis of the tristannacyclopropene R*4Sn3 in benzene at 100 °C. According to the result of the X-ray structural analysis, 4 contains a Sn8 cubane with six Sn atoms each connected with R* and two at the end o f a space diagonal connected with Na(THF)2. A preliminary X-ray structure analysis shows 5 to adopt the same Sn8 cubane structure as 4 with two bare Sn atoms at the end of a space diagonal. 
  Reference    Z. Naturforsch. 54b, 877—880 (1999); eingegangen am 1. April 1999 
  Published    1999 
  Keywords    Silicon, Tin, Sodium, Tincluster, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0877.pdf 
 Identifier    ZNB-1999-54b-0877 
 Volume    54 
10Author    E. Bengsch, J. Polster, M. SchwenkRequires cookie*
 Title    Effects of Simultaneous Supply of Silicon and Boron on Plant Growth and on Herbicide Toxicity  
 Abstract    An optimal supply of biodisposable silicon and boron shows a synergistic stimulation effect on plant growth. U nder these optim al growth conditions herbicides may become particularly toxic for cultural plants. Plants inhibited by herbicides show distinctly higher boron contents than that of untreated samples. 
  Reference    Z. Naturforsch. 44c, 781—786 (1989); received April 24 1989 
  Published    1989 
  Keywords    Silicon, Boron, Plant G row th, H erbicide, Spinach 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0781.pdf 
 Identifier    ZNC-1989-44c-0781 
 Volume    44 
11Author    J. Polster, M. Schwenk, E. BengschRequires cookie*
 Title    The Role of Boron, Silicon and Nucleic Bases on Pollen Tube Growth of Lilium longiflorum (L.)  
 Abstract    It is possible to obtain pollen germination and pollen tube growth in vitro if boric acid is present. In this work the effect was studied using as a semiquantitative parameter the mean length (J) o f Lilium longißorum pollen tubes. Pollen tube growth was examinated in depend­ ence on boric acid, ortho-silicic acid, nucleic bases, Ca2+ and Zn2+ in 10% sucrose solution. The maximum o f 7is obtained for concentrations between 2 -2 0 ppm boron. The simultaneous supply o f silicon added as water glass leads to a synergistic stimulation effect on pollen tube growth and facilitates branching. The silicon action is preceded o f a pollen tube growth inhibi­ tion period during 3 h. Adenine and guanosine are able to substitute partially boron as pollen germination and pollen tube growth stimulator. Concentrations o f 100 ppm adenine leads to half the boron effect. The same stimulation effect is obtained by guanosine. Ca2+ can partially substitute boron as well. The stimulation action o f boron is significantly attenuated by Zn2+ and by the herbicide Dicuran. These and preceding results from physiological studies indicate that boron and silicon should be essential trace elements for the regulation o f molecular bio­ logical processes. 
  Reference    Z. Naturforsch. 47c, 102—2 (1992); received June 13/September 16 1991 
  Published    1992 
  Keywords    Pollen Tube Growth, Boron, Silicon, Lilium longiflorum, Germination 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0102.pdf 
 Identifier    ZNC-1992-47c-0102 
 Volume    47 
12Author    E. Bengsch12, F. K. Orte2, J. Polster3, M. Schwenk3, V. ZinkernagelRequires cookie*
 Title    Reduction in Symptom Expression of Belladonna Mottle Virus Infection on Tobacco Plants by Boron Supply and the Antagonistic Action of Silicon  
 Abstract    Boron and silicon have a dram atic influence on the expression of symptoms caused by plant virus infections. For tobacco plants, boron decreases and silicon enhances symptom expression after belladonna m ottle virus infection. Infected leaf tissues are highly enriched on both trace elem ents. Boron supply stim ulates the silicon accumulation. In the applied concentrations the trace elem ents have no phytotoxic effects on the host. Except endogeneous ß-interferones, this could be the first example of antiviral action without any cytotoxicity. 
  Reference    Z. Naturforsch. 44c, 777—780 (1989); received February 13/April 18 1989 
  Published    1989 
  Keywords    Plant Virus Infection, B oron, Silicon, Tobacco, Belladonna M ottle Virus 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0777.pdf 
 Identifier    ZNC-1989-44c-0777 
 Volume    44 
13Author    Nils Wiberg, Angelika Wörner, Hans-Wolfram Lerner, Konstantin Karaghiosoff1, Heinrich Nöth1Requires cookie*
 Title    Darstellung  
 Abstract    , Struktur und Reaktivität des Pentaphosphids (/Bu3Si)3P5Na2 und des Pentaphosphans (fBu3Si)3P5 [2] Supersilyl Compounds of Phosphorus, V [1]. Preparation, Structure, and Reactivity of the Pentaphosphide (?Bu3Si)3P5Na2 and the Pentaphosphane (?Bu3Si)3P5 [2] The orange THF adduct (fBu3Si)3 P5Na2(THF)4 of the pentaphosphide (rBu3Si)3P5Na2 (3) has been prepared, (i) by protolysis of the tetraphosphide (?Bu3Si)2P4Na2(THFj;! (2) with CF3C 0 2H in THF (molar ratio 2 : 1) , (ii) by dissolving crystalline 2 in toluene, and (iii) by the reaction of P4 with /Bu3 SiNa(THF)2 in benzene (molar ratio 1 : 4). According to an X-ray structural analysis, the THF adduct of 3 contains a P3 ring with two PNa(Si?Bu3) substituents in cis position and one SifBu3 substituent in trans position to the former groups. The protolysis of 3 with CF3C 0 2H leads to the pentaphosphane P5 H2(SifBu3) 3 (9), the silylation of 3 with Me2SiCl2 to the pentaphosphane P5(SiMe2)(Si?Bu3) 3 (10), and the oxidation of 3 with C2(CN)4 to the pentaphosphane P5 (Si/Bu3) 3 (5). The structures of 3,5,9, and 10 have been assigned from 1|P and ~4Si NMR data. The pentaphosphane 5 contains a hitherto unknown Ps backbone of a P3 ring anellated with a P4 ring. Supersilylverbindungen des Phosphors, V [1]. 
  Reference    Z. Naturforsch. 53b, 1004—1014 (1998); eingegangen am 17. April 1998 
  Published    1998 
  Keywords    Silicon, Phosphorus, Supersilyl, Oligophosphides and -phosphanes, NMR Data, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1004.pdf 
 Identifier    ZNB-1998-53b-1004 
 Volume    53