up to t,he laws of conservation, definite and multiple proportions, the author builds ball and stick models of simple molecule5-CCL, HlOs and CO1-and expands these models in a later longer chapter to the classes of organic compounds. Almost all of these structures covered in some 50 pages shoold be well known to the chemistry teacher and the drawings are to he found in most textbooks, except, perhaps, for some "threedimensional" diagrams of geometric and stereoisomeru. A brief chapter deals with atomic orbital molecular models involving s and p orbitals and structures such as H1O and NHa. Not inclnded here but which would he of use to many presentations of modern chemistry are the more complex structrlrd representations of hybridiaation, multiple bonding, and electron delocalization, as in the ozone molecule. The most attractive part of the book is that dealing with aocrrate molecular and crystal models, where space-filling and sphere-and-dowel (a ball and stick variety) models are developed. Examples are HsO, P,, Ss, polyatomic ions, e.g., NO8-, complex ions, e.g., Cr(NHs),Cb'., and the unit cell and lattice representations of cubic close packing, body centered cubic, NaCl, CsCI, CaF,, graphite, diamond, and ice structures. Although the book is profusely illustrated, diagrams of "sliced" models of cubic close packing and body centered cubic would have been helpful here in "seeing" eighths, halves, etc. Following the crystal models is a final chapter of some quantitative applications of $he crystal models useful to the teacher 'who wishes to make B convincing presentation of crystal pstterns. Calcnlations of metal ntomio radii, alkali halide internuelectr distances, ionic radii, and radius ratios of ionio structures are explored with comparisons of calculated and otherwise reported values. The Appendix has tables of atomic, Van der Waal, ionic radii, and unit cell dimensions for ccp, bco, diamond, MX, MIX, and MX. crystals. Also in the Appendix is a listing of sources that snpply construction materialu, and a reference listing of standard texts on structural chemistry. Constrmtion details in the text descriptions and in the diagrams appear plentiful for successful results.
organization of each ohapter is best understood by a consideration of the chapter on niobium and tantalum. The known halides and oxyhalides of hoth metals are tabulated. Methods of preparation, physical properties, and structural information are d l presented in tabular form and discussed. No attempt is made to review exhaustively the simple adducts formed by the compounds (i.e., MX5.D, where D = donor group). Halides and oxyhalides of one oxidation state are placed together. The several oxidation states are taken up in order of decreasing oxidation number. The halometallrttes, e.g., compounds of NhF?, NbFa-, N h C k , NhCla2-, etc, and oxohlometallates, e.g., compounds of NbOClF, NbOCL-, NbOP-, etc., make up the second half of the chapter, again in order of decreasing oxidation number. Referencing starts anew with each chapter and includes the literature through 1966. An addenda adds new information up to March 1968. The 298 references to the niobium and tantalum chapter is placed immediately followingthe text of the chapter. An example of the completeness of information included may be estimated from reviewing the text on ZrF,. A table list,v 13 methods of preparation, with reference numbers. The thermodynamic properties of the eompormd are tabdated in two tables. The two polymorphs are compared with respect to preparation and structural relationship. The projection of the ZrF, struct~rrealong the c-axis is shown in a clear figure. A few errors are noted, some of which are the result of carelessness, others just oversight. For example the authors state the "direct chlorination of oxides has been well investigated for the transition metals of Groups IV to VII, inclusive." HANSB. JONASSEN Such is simply not so. Also from Table Tulane University 2.2 one learns that ZrOn can he converted N m Orleans. Louisiana 70118 to ZrCI. at elevated temperature, according to ref. 9. On page 103 of ref. 9 the dear statement read8 "chlorine alone does not Halides of the Transition Elernenlr. attack ZrO* appreciably a t any observed Halides of the Second and Third Row temperature." Transition Metals The thorough coverage and clear presentation of information combine to J . H. Canterford and R. Collon, Univermakc this hook a. valuable addition to the sity of Melbourne, Parkville, Victoria. research library. I t is required reading John Wiley & Sons h e . , New York, for anvone startine out in the field. It is a 1968. xxx 409 pp. Figs. and tables. 16 X 23.5 cm. $15.95. G s o n ~ l rMARTINS Newton Junior College This volume is a carefully-planned and Newtaville, dlassachuselts well-executed monograph on the title S. Y. TYREE,JR. subject. k., a worker in the field this College of William and M a y reviewer can testify that the authors Williamsburg, V i r ~ i n i a25185 have covered the literature very well. In fact oxyhdides and halometsllllste and Reaclions of TmnsitionMetal Complexes oxohalometdlllate comnlexes are included J . P. Candlin, K . A. Taylor, and D. T . Thompson, Imperial Chemical IndusPrinciples of Modern tries, Ltd., Petrochemical and Polymer Helerocyclic Chemistry reviews. General preparative techniques Laboratory, The Heath, Runcorn, CheLeo A. Pquette, Ohio State University, and physical properties of the fluorides shire (England), American Elsevier Columbus. W. A. Benjamin, Inc., are the subjects of Chapter 1. The other Publishing Ca., New York (1968). xvi 401 pp. Figs. New York, 1968. xiv halides are discussed together in Chapter 483 pp. $30. and tables. 14.5 X 22 cm. $11.95. 2. Chapter 3 considers "closter comWritten by three research scientists who pounds." Each suoceeding chapter re Certainly the author has done the right have been active in the field of transition capitdates in detail the present state of thing; he bas described heterocyclic ring metalorganic complexes practically since knowledge for a pair of metals, zirconium systems from a. mechanistic approach, and its beginning, this hook is a comprehensive and hafnium, niobium and tantalum, review of this field. The compilation of . . . . , silver and gold. Group 111 t,he result is simply magnifiertnt. The literature references is practically commetal compounds are not included. The (Continued a page A628)
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plete through the early part of 1967. The first of the three parts of this book considers the mechanisms of three of the important types of reactions of these complexes: substitution, combination, and Red-Ox. This area is covered in about 200 pages in a. manner which is all-inclusive. Its lack of selectivity makes this nmt therefore not as mod as some of the well-known text b o o k in this area. The second part reviews in about 200 pages the various reactions with organic and inorganic reagents such as hydrocarbons, organic halogens, CO, CN-, ORas well as H f , H-, Rap (As, Sh) and mole cules such as Hz,X., SOzand others. The third and shortest section (20 pages) deals with reactions by which stable and unstable new organic systems can he made and it includes metalloeene, carhenes, r-bonded heterocycles and many others. This book was written for research scient,ists in this area and presupposes an excellent chemistry background. This, depending upon one's point of view, may he an advantage or disadvantage but it makes it possible to leave out much of the theories and principles usually found in books of this type. It also produces a book full of a wealth of information and facts even for a reader with some familiaritv.. in this field. Maximum benefit from rhc comprehcn~ivrdimw-ions mn only he resiirod nftrr scvcrnl ronrcntrntd rcsdings. Even though this reviewer must mention the high price ($30) as a shortcoming this is a book which should be readily available to all working in this area. The format of the book is pleasing, typographical errors seem to be absent, and the reaction schemes, formulas, and structures are clearly presented.
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Journal of Chemical Education
