# Book Review Rechenseminar in physikalischer Chemie. (Problems in Physical Chemistry). By K. Torkar

код для вставкиСкачатьvolume one finds many differences from the earlier conception of Gmelin’s Handbook. The most important, in the reviewer’s opinion, appears to be the successful abandonment of the historical but long outdated division into an inorganic and a n organic section. A considerable part of the book is devoted to the organoruthenium compounds. If the same procedure is followed in future volumes, the value of “Gmelin” to the chemist will be greatly enhanced. Even a quick glance through the present volume gives the impression that it is a chemical reference book, and not merely a collection of physical constants, as many of the earlier volumes seemed t o be. Another innovation is the abandonment of the earlier, often excessively rigid arrangement in favor of a chemically more logical classification. Salts of complex acids of ruthenium are now dealt with under the various nonmetals. LiRuF6, for example, is to be found in the section on “Ruthenium and Fluorine“. Finally, a very welcome change is that the present volume almost attains the currency of progress reports. The literature is completely evaluated up to the end of 1968, and many important publications from 1969 are also taken into account. The first two main sections of the volume deal with the properties of the element and its alloys. Ruthenium, which was of no special importance in industry a relatively short time ago, has rapidly grown in importance during the past few years. It is a n efficient catalyst in many hydrogenation reactions, and the nuclear chemist is concerned with its isotopes as fission products of uranium and plutonium, while some of its alloys have superconducting properties. The third main section describes the compounds of ruthenium. Considerable space is devoted to the discussion of the very numerous nitrosyl compounds. This is followed by a description of the compounds with neutral and inner complex forming ligands, the carbonyl compounds, and the organometallic compounds of ruthenium. A further innovation is found at the end of the volume in the form of a n alphabetic subject index and a formula index for the ligands, which make it much easier t o find groups of compounds and individual compounds. Ekkehard Fluck P B 894 IE] Zahlentafeln zur Massenspektrometrie und Elementaranalyse (Numerical Tables for Mass Spectrometry and Elemental Analysis). By G . Ege. Verlag Chemie, Weinheim/Bergstr. 1970. 1st Edit., xxvi, 352 pp., 356 tables. The determination of empirical formulas from elemental analyses is made much easier with Ege’s “Zahlentafeln zur Elementaranalyse” (Numerical Tables for Elemental Analysis). However, if a n analysis is not exact, several possible formulas have to be considered; for example, the C and H analytical values of homologs are often situated so close together that i t is impossible to decide in favor of one or the other compound. In such cases i t is possible t o reach a decision on the basis of the molecular weight, which can be determined mass-spectrometrically. Acknowledging this fact, Ege has now expanded his original Tables into their present form. To keep the volume of the material within reasonable limits the tables are restricted to carbon compounds with not more than 40 carbon, 6 nitrogen, 12 oxygen, and a n appropriate number of hydrogen atoms. On the whole this should prove adequate. The numerical tables encompass compounds with molecular weights from 16 to 845 arranged according to increasing mass. The idea of grouping the theoretical analytical values into groups of ten is commendable, since i t greatly facilitates rapid location of the empirical formulas. In addition, one column gives the exact molecular weight of each compound, so that the tables can also be used t o 914 determine empirical formulas with the aid of high-resolution mass spectra. In such cases elemental analysis becomes superfluous. Data on double bond equivalents constitute another welcome feature. In contrast, the data on the intensity ratio of M+ and (M + 1)+peaks could well have been omitted, since in practice the intensity ratios of M+ and (M + 1)+ions obtainable from spectra are too inaccurate, a t any rate in the case of compounds of higher molecular weight, to enable useful conclusions to be drawn. Nevertheless, this point in no way detracts from the value of the tables, which can be warmly recommended to all laboratories engaged on the investigation of organic comGerhard Spiteller [NB 910 IE] pounds. Rechenseminar in physikalischer Chemie. (Problems in Physical Chemistry). By K . Torkar. Friedr. Vieweg u. Sohn, Braunschweig 1968. 1st Edit., xii, 172pp., 48 figures, 38 tables, bound D M 9.80. There are a considerable number of books dealing with physicochemical calculations. These generally list the laws of physical chemistry in a logical order and make use of them as a basis for examples of simple calculations. K . Torkar follows a n entirely different plan. He confines his book to four problems: 1. Calculation of the pressure relations in a n autoclave. 2. Calculation of a chemical equilibrium. 3. Boiling diagrams. 4. Chemical reaction kinetics. Under these headings he deals with 1) the formation of boehmite in a n autoclave or a n automobile COz fire extinguisher, 2) the reduction of chromium oxide by graphite or the conversion of carbon monoxide with steam, 3) the benzenetoluene system or the A-B system in general, and 4) reactions of the types A +products, aA + 6B +products, or H2 + Br2 + 2 HBr. The author thus starts with concrete problems from practice and explains the calculation procedure for the examples named in the smallest detail. He compares the various calculation methods, indicates where the necessary numerical values are to be found, and compares the data from different tabulated values. The clarity of presentation is improved by tables and graphs. This book offers the student a bridge between formula and application, and should encourage the teacher to hold similar problem seminars. Gerd Wedler [NB 898 IE] Practical Manual of Gas Chromatography. Ed. by J . Tranchanf. Elsevier Publishing Company, AmsterdamLondon-New York 1969. 1st Edit., xix, 387 pp., numerous illustrations, bound, Dfl. 85.-. English translation of the second French edition. When a book on chromatography is translated from the French into English and joins the long ranks of works already published in English in this field, it is only natural t o wonder whether the translation was simply motivated by the existence of the wider readership, or whether this readership may itself derive some benefit. The far-reaching and most welcome exclusion of theoretical ballast - a n intention already proclaimed by the title- as well as the typically Gallic conciseness and precision of thepresentation add up to a positivereply to thelatter question. The content of the book and its points of emphasis can be conveniently indicated by enumerating the titles and numbers of pages of the nine chapters contributed by six authors: 1. Principles and retention values (11 pp.); 2. Isothermal-isobaric chromatography (15 pp.); 3. Programmed chromatography (18 pp.); 4. Apparatus (37 pp.); 5. Columns (73 pp.); 6. Detectors (40 pp.); 7. Qualitative analysis; separation and identification (39 Angew. Chem. internat. Edit. / Vol. 9 (1970) No. I1

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