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The volume is concerned exclusively with all the binary species formed between the elements silicon and fluorine such as SiF, SiF2, SiF3, SiF4, and Sif62-. Most of the volume, i.e. 144 pages, is devoted to the description of the well known physical and chemical properties of the SiF4 as well as to its preparation. This is followed in length by the report on SiF2 with its interesting chemistry, along with a section on the diatomic radical SiF. Species with fivefold and sixfold coordination of silicon are exemplified by SiF5- and by the well known SiF62-. Interestingly, the detailed models for describing the bonding situation in both ions are still a matter of discussion. While for Si2F6 most of the basic data are known, information on the chemical and physical properties of the higher members of the acylic perfluorosilanes, SinF2n+2, is scarce. All available information on the unstable cyclic perfluorosilanes of composition (SiF2)n and some even more exotic species is also included.
Includes list of replacement pages.
The volume provides complete and up-to-date information on the few chemical species composed of silicon, fluorine, and noble gases and in the major part on the species composed of silicon, fluorine, and hydrogen. Among the numerous experimentally confirmed and theoretically predicted monosilicon Si-H-F species with Si coordination numbers 2, 3, and 4, the most prominent and best investigated molecules by far are Si H3F, Si H2F2, and Si H F3. Even more has been reported about aqueous solutions of hexafluorosilicic acid, "H2Si F6", a system which is not yet completely understood. Some of the isomers of partially fluorinated di-, tri-, and tetrasilanes are known to some extent, but information on the higher acyclic and cyclic polysilanes is increasingly sparce.
This is the first supplementary volume on silicon-nitrogen compounds. It begins with the system silicon-nitrogen and continues with the binary silicon nitrides, except for Si3N4 that will be the subject of a separate Handbook volume. A chapter describes anionic formula units of the type SixNr and includes a condensed description of a series of ternary silicon nitrides. A treatment follows of the molecular and polymeric silicon-nitrogen-hydrogen compounds in which hydrogen is bonded either to silicon, or to nitrogen, or to both. In other words, those compounds have been selected for this chapter in which one or more nitrogen atoms are bonded to silicon and also those compounds in which additional silicon and/or hydrogen have been bonded to the initial silicon. About 60% of this volume contains a description of predominantly molecular silicon nitrogen compounds that are substituted at the nitrogen with groups containing other elements. According to the Gmelin System the substituting groups may be bonded through sulfur, boron, carbon, or both sulfur and carbon, or both boron and carbon. As may be expected, the largest quantity of information exists for compounds that have organyl substi tuents on the nitrogen, including the class of silicon coordination compounds that fulfill the criteria. In particular in these chapters, sections and subsections have been formed grouping compounds of the same class together. Compounds containing silicon--carbon bonds any where in the molecule are not covered in this volume. General remarks have been given to introduce chapters and to link chapters and sections.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Superphosphate

United States. Agricultural Research Service. Soil and Water Conservation Research Division

Published: 1964

Total Pages: 364


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