An Electron Diffraction Study of Structures of Tetramethylorthosilicate, Hexamethyldisiloxane, and Hexachlorodisiloxane

Yamasaki, Kazuo; Kotera, Akira; Yokoi, Masatoki; Ueda, Yoshimitsu

doi:10.1063/1.1747492

Cited by 58 publications

(3 citation statements)

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“…By means of electron diffraction measurements, the Si-O bond distance in siloxane has been shown to be 1.65 A. (7,41). This value was much less than that calculated for a covalent Si-O bond, 1.83 A.…”

Section: Discussion Of Resultsmentioning

confidence: 85%

Kinetics of Filler-Polymer Interaction between Fine Particle Silica and SBR or Butyl Rubber

Wagner¹,

Sellers²

1959

Ind. Eng. Chem.

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Section: Discussion Of Resultsmentioning

confidence: 85%

Kinetics of Filler-Polymer Interaction between Fine Particle Silica and SBR or Butyl Rubber

Wagner¹,

Sellers²

1959

Ind. Eng. Chem.

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“…One possible synthesis utilizes the reaction between oxygen and silicon tetrachloride at temperatures between 900–1000 °C [37] . The molecule geometry of this compound has been elucidated by gas phase electron diffraction [38] . Hexachlorodisilathiane, S(SiCl 3 ) 2 , is obtained by high temperature reaction between silicon tetrachloride and hydrogen sulfide, or by the reaction of silver sulfide with trichloroiodosilane or silicon sulfide with chlorine [39,40] …”

Section: Neutral Trichlorosilyl Compounds Of P‐block Elementsmentioning

confidence: 99%

Trichlorosilyl Anions of p‐Block Elements – New Applications for Simple Molecules

Böhme

Riedel

2022

Eur J Inorg Chem

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Recently several trichlorosilyl anions of main group elements have been isolated and characterized. Since 2015 anions [E(SiCl 3 ) n ] À , which are stabilized solely by trichlorosilyl groups, have been prepared with E=B, C, Si, Ge, P, S. These compounds have long been overlooked due to their high reactivity. This disadvantage is also an advantage, since the high reactivity makes these anions useful as reagents in a number of transformations. Anions of this kind have been used so far in substitution reactions, as superacids, and weakly coordinating anions. This review summarizes present methods for the synthesis of these compounds. Possible applications and future developments are outlined.

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“…. tetramethylorthosilicate (CHaO)4Si(46), and hexamethylcyclotrisiloxane [(CHahSiOla(47) have been determined by electron. diffraction.…”

mentioning

confidence: 99%

Experimental Molecular Structure

Roth¹

1951

Annu. Rev. Phys. Chem.

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The principal sources of information about the structure of molecules in the free state are electron diffraction of gases, spectroscopy in the infrared, Raman and microwave regions, and x-ray diffraction of crystals. The past year has seen a continuation of the trends noted in the previous review by Beach (1). The general structural principles for most small molecules are reasonably well understood, and interest now is directed toward the under standing of variations of bond distances and angles in different molecules and the study of more complicated systems, such as larger molecules and the nature of intramolecular motions.The advances in experimental technique in electron and x-ray diffraction and the striking interpretations of pure rotational spectra in the microwave region are beginning to provide a body of information relating to interatomic parameters where the distances are reliable to 0.01 'A or better and the angles reliable to 30'. Some success is obtained in accounting for the observed inter atomic distances by modifying the sum of the covalent radii (14) with cor rections for ionic or multiple bond character (18), but it is apparent that there is a need for precise data from a largernumberof molecules. Accordingly, much of the work at the present time is concerned with improving experi mental techniques or with redetermining the structures of many molecules by the newer methods.Electron diffraction.-The need for the determination of a larger number of parameters has led many workers in the field of electron diffraction to search for increased sensitivity and objectivity. The early electron diffraction investigations were accomplished by the visual correlation technique, where calculated intensity patterns based on assumed models were compared with the visually observed diffraction pattern. As the complexity of the molecules studied increased and it became necessary to determine a larger number of parameters, it became increasingly difficult to arrive at a unique model. At the present time, many molecules are being reinvestigated and extensive work is being done to increase the accuracy and sensitivity of the experimen tal techniques.Recent papers by . the Karles (2, 3, 4) and Hastings & Bauer (5, 8) con tain detailed discussions of the effects of various experimental factors on the diffraction patterns: the proper design of a gas nozzle for introducing the sample into the electron beam, the effect of finite sampJe size and divergence of the beam, mUltiple scattering, the use of beam stops and rotating sectors, and the response characteristics of photographic emulsions.1 This review is a continuation of that of Beach (1) and covers approximately the year 19 50.

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An Electron Diffraction Study of Structures of Tetramethylorthosilicate, Hexamethyldisiloxane, and Hexachlorodisiloxane

Cited by 58 publications

References 4 publications

Kinetics of Filler-Polymer Interaction between Fine Particle Silica and SBR or Butyl Rubber

Kinetics of Filler-Polymer Interaction between Fine Particle Silica and SBR or Butyl Rubber

Trichlorosilyl Anions of p‐Block Elements – New Applications for Simple Molecules

Experimental Molecular Structure

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