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The Journal of Physical Chemistry 1955 Volume.59 No.11

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The Journal of Physical Chemistry 1955 Volume.59 No.11 Vol. 59 NOVEMBER, 1955 No. 11 THE JOURNAL OF PHYSICAL CHEMISTRY (Registered in U. S. Patent Office) SYMPOSIUM ON BOND MOMENTS, KANSAS CITY, MO., MARCH 24, 1954 Charles P. Smyth: Bond Moment and T ype............................................................................................................................. 1121 D. F. Eggers, Jr., I. C. Hisatsune and L. Van Alten: Bond Moments, their Reliability and Additivity: Sulfur Dioxide and Acetylene.............................................................................................................................................................................. 1124 Gordon M. Barrow: The Intensities of Infrared Hydroxyl Bands........................................................................................ 1129 D. F. Hornig and D. C. McKean: Bond Moments and Molecular Structure..................................................................... 1133 A. Packter: Studies on the Crystal Growth of Soluble Metal Salts. I. The Effect of “ Protecting Agents” on the Interface Reaction...................................................................................................................................................................... 1140 H. Tracy Hall: The Melting Point of Germanium as a Function of Pressure to 180,000 Atmospheres..................... 1144 Mei Chio Chen, Carl J. Christensen and Henry Eyring: Kinetics of Oxidation of Pyrolytic Carbon........................... 1146 Ole Lamm: The Dynamics of the Diffusion of Fluids in Relation to the Choice of Components................................. 1149 R. Greene-Kelly: Lithium Absorption by Kaolin Minerals................................................................................................ 1151 L. J. E. Hofer, E. Sterling and J. T. McCartney: Structure of Carbon Deposited from Carbon Monoxide on Iron, Cobalt and Nickel...................................................................................................................................................................... 1153 W . A. Pliskin and R. P. Eischens: The Effect of Using the Pressed Salt Technique to Obtain the Spectrum of Chemi­ sorbed Ammonia......................................................................................................................................................................... 1156 Alvin S. Gordon and R. H. Knipe: The Explosive Reaction of Carbon Monoxide and Oxygen at the Second Explosion Limit in Quartz Vessels............................................................................................................................................................. 1160 W. R. Krigbaum and D. K. Carpenter: The Configuration of Polymer Molecules: Polystyrene in Cyclohexane... 1166 David L. Camin and Frederick D. Rossini: Physical Properties of Fourteen API Research Hydrocarbons, C9 to C16.. 1173 Note: James M. Schreyer and C. F. Baes, Jr.; .TbnSolpbilitJ',qf TJQ^JP04-4HS0 in Perchloric Acid Solutions. 1179 Note: John P. Ryan and Joseph Wm. Shepard” i SfrliBjiJrfc'c# ftyeqrati* Acid Monolayers in the Region Le-G.. .. 1181 Note: Elton M. Baker: The Ternary System n-Propyl AlcohcdV^ofuene-Water at 25°.............................................. 1182 Communication to the Editor: A. Klinkenbergr • A Molecular Dynamic Theory of fjhromatography........................ 1184 THE JOURNAL OF PHYSICAL CHEMISTRY (Registered in U. S. Patent Office) W. Albert N otes, Jr., E ditor Allen D. Bliss Assistant Editors Arthur C. Bond Editorial B oard R. P. Bell Paul M. D oty S. C. Lind E. J. B owen G. D. Halset, Jr. H. W. M elville R. E. Connick J. W. K ennedy W. 0 . M illigan R. W. D odson E. A. M oelwyn-Hughes Published monthly by the American Chemical Society at Symposium papers should be sent in all cases to Secre­ 20th and Northampton Sts., Easton, Pa. taries of Divisions sponsoring the symposium, who will be responsible for their transmittal to the Editor. The Secre­ Entered as second-class matter at the Post Office at Easton, tary of the Division by agreement with the Editor will Pennsylvania. specify a time after which symposium papers cannot be accepted. The Editor reserves the right to refuse to pub­ The Journal of Physical Chemistry is devoted to the pub­ lish symposium articles, for valid scientific reasons. Each lication of selected symposia in the broad field of physical symposium paper may not exceed four printed pages (about chemistry and to other contributed papers. sixteen double spaced typewritten pages) in length except Manuscripts originating in the British Isles, Europe and by prior arrangement with the Editor. Africa should be sent to F. C. 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Bliss, received more than sixty days from date of issue (because of Department of Chemistry, Simmons College, 300 The delivery hazards, no claims can be honored from subscribers Fenway, Boston 15, Mass. in Central Europe, Asia, or Pacific Islands other than Hawaii), (2) if loss was due to failure of notice of change of Business Office: Alden H. Emery, Executive Secretary, address to be received before the date specified in the pre­ American Chemical Society, 1155 Sixteenth St., N. W., ceding paragraph, or (3) if the reason for the claim is “ miss­ Washington 6, D . C. ing from files.” Subscription Rates (1955): membersof American Chemi­ Advertising Office: Reinhold Publishing Corporation, 430 cal Society, 18.00 for 1 year, $15.00 for 2 years, $22.00 for 3 Park Avenue, New York 22, N. Y. years; to non-members, $10.00 for 1 year, $18.00 for 2 years, Articles must be submitted in duplicate, typed and double $26.00 for 3 years. Postage free to countries in the Pan spaced. 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All footnotes and refer­ Canadian postage $0.05. ences to the literature should be numbered consecutively The American Chemical Society and the Editors of the and placed in the manuscript at the proper places. Initiais Journal of Physical Chemistry assume no responsibility for of authors referred to in citations should be given. Nomen­ the statements and opinions advanced by contributors to clature should conform to that used in Chemical Abstracts, T h is J o p b n a l . mathematical characters marked for italic, Greek letters TIM ‘American Chemical Society also publishes Journal o f carefully made or annotated, and subscripts andÇftJeÿscirlplâ * Ihe'Amiifichn Chemical Society, Chemical Abstracts, Industrial clearly shown. Articles should be written as brieflyjastflofe- Î \ajid Engineering Chemistry, Chemical and Engineering News, sible consistent with clarity and should avoiti'histdriehf * ' Analytical 'Chemistry, and Journal of Agricultural and Food. background unnecessary for specialists. * Chemistry. Rates on request. • ••* THE JOURNAL OF PHYSICAL CHEMISTRY (Registered in U. S. Patent Office) (Copyright, 1955, by the American Chemical Society) V o l u m e 59 NOVEMBER 17, 1955 N u m b e r 11 BOND MOMENT AND TYPE1 B y C h a r l e s P. S m y t h Department of Chemistry, Princeton University, Princeton, New Jersey Received May 18, 1955 A bond moment is a measure of the asymmetry of charge distribution in the bond and its immediate vicinity and is affected by the environment of the molecular section in question. The moment values, 0-2.0 X 1(R18, for typical covalent single bonds lie, for the most part, between zero and about 0.2 of the values which they would have if they were pure, undistorted ionic bonds, and those of coordinate single bonds, 3-4.5 X 10_18, lie between 0.35 and 0.65 of the undistorted ionic bond values. The lower limits, 2-4 X 10~IS, established for bonds between metallic and acidic elements in organometallic com­ pounds indicate polarities roughly intermediate between those of typically covalent and those of typically ionic bonds. The moments found for salt molecules, 6-20 X 10-18, are lowered by inductive distortion of the electronic shells below' those calculated for the undistorted ionic structures. The covalent single bond moments tend to increase roughly with increase in the electronegativity
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