R.B. Heimann – författare
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3 produkter
3 produkter
Del 21 - Physics and Chemistry of Materials with Low-Dimensional Structures
Carbyne and Carbynoid Structures
Inbunden, Engelska, 1999
2 156 kr
Skickas inom 10-15 vardagar
A collection of topical and mostly critical reviews written by professionals who are working or have been working in this and related fields, this book intends to provide a complete, ordered and concise summary of what is known (or not known) about carbyne at this date. The authors have tried to be critical of overstated results and expectations and have made an effort to provide a balanced approach to the controversial topic. The book provides a sound approach to this elusive carbon allotrope. This book will be of interest to research scientists (both experimentalists and theoreticians), postgraduate and graduate students working in the field of chemistry and physics of carbon (including diamond and diamond-like materials, graphite intercalation compounds, fullerenes, carbon nanotubes and related areas), conjugated and/or bio-polymers, and one-dimensional molecular systems.
760 kr
Skickas inom 10-15 vardagar
2 156 kr
Skickas inom 10-15 vardagar
1.1. THE DISCOVERY OF CARBYNE Yu.P. KUDRYA VTSEV A.N. Nesmeyanov Institute ofOrganoelement Compounds, Russian Academy of Sciences, 117813 Moscow, Russia Abstract - The history of the discovery of carbyne is briefly recalled. The existence of carbyne was first disclosed by Russian researchers in 1960. It was obtained for the first time via oxidative dehydropolycondensation of acetylene based on the Glaser coupling of ethynyl compounds. 1. Introduction The polymeric nature of carbon was first pointed out by Mendeleev. He wrote: "The molecules of coal, graphite, and diamond are very complicated, and carbon atoms exhibit the capability of binding one to another to form complex molecules in all compounds of carbon. None of the elements possesses an ability of complicating in such an extent as does carbon. There is still no basis to define the polymerization degree of the coal, graphite, or diamond molecules. One should believe, however that they contain en species, where 'n' is a large value" [IJ. Until the 1960s only two allotropic forms of carbon were known, viz., graphite and diamond, including their polymorphous modifications. For a long time 'amorphous carbon' was also included among the simple forms. Presently, however, the structure of amorphous and quasi-amorphous carbons (such as carbon blacks, soot, cokes, glassy carbon, etc.) is known to approach that of graphite to various degrees [2J.