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Book Review Valence Theory. By J. N. Murrell S. F. A. Kettle and J. M

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the only information offered regarding a table containing
values of heats of formation, free energies of formation, the
logarithms of the equilibrium constants of the formation
reactions, and the entropies of compounds is that “all values
are expressed as kilo-cals”. The Handbook contains such a
wealth of information that it would be regrettable if its value
were to be diminished by inaccuracies of this nature.
If. Griinewold
[ N B 512 IE]
The Organic Chemistry of Titanium. By R . Feld and P . L .
Cowe. Butterworths, London 1965. 1st ed., viii, 213 pp.,
6 illustrations, several tables, bound L2112j6.
The chemistry of organic titanium compounds has been
developing rapidly for more than ten years. Research in this
field has received impetus from the discovery of Ziegler
catalysts. The scientific and patent literature has become so
extensive that a survey of the entire field in the form of this
monograph is very welcome. The material has been concisely
and lucidly arranged in 12 chapters, and the numerous compounds discussed are summarized in tables togeqer with
their properties. Extensive lists of references, also covering
the patent literature, are given at the end of each chapter.
The following classes of compounds are discussed : organometallic compounds of titanium, titanate esters and ester
chlorides, chelates, products of the reaction of titanium
compounds with polyalcohals, carboxylic acid derivatives
(titanium acylates), compounds af titanium with organic
derivatives of other metals,compounds containing the group
Ti-0-Si, addition compounds of titanium halides, and
derivatives of bi- and trivalent titanium.
The chaptcrs on the organometallic cornpounds of titanium
and their use as polymerization catalysts will find particular
interest among specialists, but the selection of the references
leaves something to be desired. A welcome feature of this
book is the fact that the many applications are illustrated on
the basis of an extensive patent literature.
On the whole, this handy book provides a n excellent survey
of the organic compounds of titanium.
H . Bestinn
[NB 522 1EI
L‘alence Theory. By J . N . Murrell, S . F. A . Kettle, and J . M .
Tedder. John Wiley & Sons Ltd., London 1965. 1st edit.,
xiii+ 401 pp., numerous figs., bound L2.10.- (about F7.-).
In recent years theoretical chemistry has become of ever increasing importance in the training of chemists. So it 1s
understandable why the number of new‘ books, and in
particular of introductory textbooks, in this fietd is very
great. According to the preface, Murrell.\Ketfle and Tedder’s
“Valence Theory” is intended for first year chemistry
students and for graduates who have not spzcialized in
theoretical chemistry. It IS divided into two parts: The first
five chapters give a descriptive account of the atomic theory
and the foundations of the theory of chemical bmding; it is
intended for the beginnet. The second and by hluch the larger
part of the book demands a knowledge of the fundamentals
of differential, integral, and vector calculus; it offers a more
mathematical description of the quantum-mechanical methods of theoretical chemistry. In 13 chapters it treats atomic
theory, MO and VB theory, ligand-field theory, ?s-electron
systems, and chemical reactivity. Individual sections are concerned also with electron-deficient compounds, the inductive
and the resonance effect, donor-acceptor complexes, and the
hydrogen bond. In this way the theoretical methods of
organic and inorganic chemistry are clearly presented and
explained with examples. Particular mention should be
made of the chapter on symmetry and ligand-field theory,
which introduces the concepts of group theory extremely
briefly but in easily intelligible form and includes detailed
examples of its use.
The authors state their aim as closing the gap between the
more qualitative description in Coulson’s “Valence” and the
formal-mathematical treatment in E y i n g , Wnlrer, and Kimhall‘s “Quantum Chemistry”. In this they have been completely successful, not least by means of the numerous problems at the end of each chapttr; indeed the mathematicallj
less advanced chemist obtains a complete understanding of the
methods of quantum chemistry only by personal intensive
participation. There is, therefore, value in the idea of giving
indications for solution of the problems in a first appendix and
complete solutions in a second.
Mirrrell, Kettle, and Tedder’s “Valence Theory” is a book
which, it is to be hoped, as many chemists as possible will
work through. It is very warmly recommended to all.
[NB 490 I € ]
pH and potentiometrische Titrierungen (pH and Potentiometric Titrations). By F. L. Hahn and R . E. Fresenius. Methoden der Analyse in der Chemie (Methods of Chemical
Analysis), Vol. 3, Akademische Verlagsgesellschaft, Frankfurt a.M. 1964, 1st ed., x, 110 pp., D M 18.- (ca. $4.50).
The first part of this book deals with the calculation of the
pH value of aqueous solutions of acids and bases. In keeping
with the limited size of this section (12 pages), which is
evidently intended as a sort of introduction, the discussion
of pH and the calculation c r estimation of pH values stops
at a rather elementary stage. At the same time a new terminology for acid-base systems (“basacid systems”) is
suggested, which at first seems rather unfamiliar and unconventional, but which on closer examination convinces
by its consistence. The remainder of the book is mainly
devoted to the determination of the end-point in potentiometric titrations, and it is repeatedly emphasized that the
end-point of a potentiometric titration does not always
coincide with the maximum of the recorded curve. Around
this central theme are grouped a number of further discussions on various S O M C ~ S of error and on the determination
of end-points by intwpolation and extrapolation. Unfortunately, the advances in eaulpment in the last 25 years
are completely ignoredapart from a passing reference to
the glass electrode and automatic recording titration instruments; moreover, no mention is made of titrations in nonaqueous systems. This is undoubtedly a good book, but it has
unfortunately been published 25 years too late. However, the
theoretical discussions in the book are still valid; they are
consistently thought out and clearly formulated. However, in
present-day determinations requiring extreme accuracy,
dropwise titrations with a tap buret are no longer used, but
are replaced by instrumental methods.
J . T . CIerc
[NB 508 IE]
Registered names, trademarks, etc. used in this journal, even without specific indication thereof, are not t o be considered unprotected b y law.
0 1966 by Verlag Chemie,
- Printed in Germany by Druckerei Winter, Heidelberg.
All rights reserved. N o part of this journal may be reproduced in any form whatsoever, e.g. by photoprint, microfilm, or any other means, without
written permission from the publishers.
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Chief Editor: W . Foerst Editor: H . Grunewald.
Publishers: Verlag Chemie GmbH. (President Eduard Kreurhage), Pappelallee 3, Weinheim/Bergstr., Germany, and Academic Press Inc. (President
Walter J. Johnson), 1 1 1 Fifth Avenue, New York 3, N.Y., USA, and Berkeley Square House, Berkeley Square, London, W. 1, England.
Correspondence concerning advertisements should bc addressed to Verlag Chemie. GmbH. (Advertising Manager W.Thiel), Pappelallee 3, Weinheim!
Bergstr., Germany, Telephone Weinheim 3635, Telex 465516 vcbwh. Cable address: Chemieverlag Weinheirnbergstr.
Cheni. internat. Edit.
Vol. 5 (1966) , N o . I0
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