Memorandum from Linus Pauling to Sidney Weinbaum. June 12, 1950. Page 1  Larger Images / More Information. 2 pp.  View Transcript

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Activity Listings

• Check from AHP to Ray Edwards for $9.74. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-1950; 1960-1962), Box #4.019, Folder #19.2]
• Check from AHP to The New Yorker for $11.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]
• Check from AHP to Warren Jones for $100.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Check, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]
• Check from LP to Dakan Engineering Company for $2,000.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]
• Counter Receipt from Bank of America from LP’s Commercial Account for $150.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1948-November 1950; 1960-1962), Box #4.019, Folder #19.2]
• Interoffice Memorandum: from LP to Sidney Weinbaum. [Filed under LP Science: (Manuscript Notes by Linus Pauling re: Chemical Bonds, 1944-1953), Box #3.005, Folder #5.19]

  CALIFORNIA INSTITUTE OF TECHNOLOGY

  June 12, 1950

  To Sidney Weinbaum

  Subject_____Quantum mechanical calculations.________________________

  I would like you to make some calculations for me by the method described in a paper by L. Pauling and G. W. Wheland, J. Chem. Phys., 1, 362 (1933). I am interested in having calculations of the resonance energy in some free radicals made, similar to those reported in Table III, and using the method described on the preceding page. This calculation is made by considering only unexcited structures; the structures were all given equal weights. But I believe that this is sufficiently good for the purpose.

  The free radicals for which I would like these calculations made are the following:

  1. The radical obtained from a methyl radical, CH₃, by replacing one hydrogen by the butadiene group. In this radical there are 5 significant carbon atoms in a chain. We can describe the structure by placing a double bond between carbon atoms 1 and 2, then a single bond, then a double bond, then a single bond to the last carbon atom, which has a free valence on it. This would be carbon atom number 5. The free valence could, however, be on carbon atom number 3, or on carbon atom number 1, with the double bonds in other positions. The calculations are made by use of a phantom orbital to which the free valence is formally connected.

  2. A benzene ring, with a chain of 3 carbon atoms attached, there being a double bond between the first carbon atom and the second carbon atom, and a free valence on the third carbon atom. This free valence can move on to the first carbon atom or into any one of

  three positions in the benzene ring, by redistributing the four double bonds. There are thus seven structures altogether, the factor 2 coming in for each of the structures in which the free valence is in the side chain.

  3. A naphthalene molecule in which carbon atom number 2 is not considered. The free valence can then be on carbon atom number 1, there being a double bond between carbon atoms 2 and 3 and a completed benzene ring, or in any one of several other positions.

  4. Two benzene rings attached to the same carbon atom. The free valence can be on the central carbon atom, or in any one of three positions in either of the two benzene rings.

  5. A biphenyl group with a carbon atom attached to one of the ortho carbon atoms in one of the benzene rings. This is ortho-biphenyl methyl free radical - the results should be much like those given in the table for para-biphenyl methyl free radical. Would you also carry out the calculation for system number 1 above, using all five structures, instead of just three. Also, using just three, but not with equal weights.

• Letter from Alfred W. Kwiecinski to LP RE: Explains his theory and responds to LP’s objections. Encloses some drawings and his articles. [Letters from LP to Kwiecinski, June 9, 1950 and June 28, 1950] [Filed under LP Correspondence: (K: Correspondence, 1950), #200.15]
• Letter from Dr. Emil Ott to Dr. Hermann Heckel RE: Explains that the proposed plans for Chemical Abstract were adopted at the ACS board meeting and that an article will be put in News Edition that will clearly outline the new plan. [Filed under LP Science: (American Chemical Society: Materials re: Committees and Awards, 1944-1949), Box #14.009, Folder #9.4]
• Letter from Elliott R. Weyer, Charles, Pfizer and Company, Inc., RE: Denies LP’s request for a grant to the Division of Biology at Caltech. [Letter from Weyer to LP June 7, 1950 and Letter from LP to Weyer, June 21, 1950] [Filed under LP Correspondence: (Charles Pfizer and Company, Inc., 1950, 1969), #70.1]
• Letter from G. E. Burch, School of Medicine, Tulane University, to LP RE: States that he is pleased that LP will be able to take on Dr. Bresler next year. Tells LP that Dr. Bresler is thrilled to have this opportunity and will be contacting LP soon. Indicates that he received LP’s calculations on the flame photometer problem and will contact him after they have studied the data and equations thoroughly. [Letter from LP to Burch, June 7, 1950] [Filed under LP Correspondence: (Burch, George E.), #33.8]
• Letter from Hans Neurath, Department of Biochemistry, Duke University School of Medicine, RE: Asks for LP’s advice about whether or not he should take a job offer to be the Chairman of the Department of Biochemistry at the new medical school in Seattle, Washington. [Letter from LP to Neurath, June 21, 1950] [Filed under LP Correspondence: (Neurath, Hans), #276.8]
• Letter from Kosuke Ohki to LP RE: Conveys his ideas about levels of electrons, charges, and bonds. [Filed under LP Correspondence: (O: Correspondence, 1950), #300.12]
• Letter from Professor Robert J. Havighurst, Chairman of the Executive Board, Committee for Peaceful Alternatives, RE: Expresses their disappointment that LP was unable to participate in the Mid-Century Conference for Peace. Discusses the Conference, the many delegates in attendance, and the results of the elections. Encloses two documents about the event. Asks LP to sign and return the enclosed card indicating that they can count on LP for his counsel in the coming months. [Filed under LP Peace: (Assorted Peace Groups) Box #4.011 Folder #11.1]
• Letter from Walter A. Lawrance, Head of the Department of Chemistry, Bates College, to LP RE: Thanks LP for the courtesies he extended to him during his stay in Pasadena. Expresses his regret that LP was away when he visited his office to say goodbye. States that he hopes to see LP at a future ACS meeting. [Letter from LP to Lawrance, June 21, 1950] [Filed under LP Correspondence: (L: Correspondence, 1950), #230.16]
• Memo from Dr. David E. Price, Chief, Division of Research Grants & Fellowships to LP RE: Explains that his grant-in-aid has been recommended for funding but no action can be taken until the appropriation bill has been passed by Congress and signed by the President. Assures him he will be notified when the bill is enacted. [Letter from Seger to Green March 16, 1950, Letter from LP to Price July 27, 1950] [Filed under LP Science: (United States Public Health Service: “X-Ray Diffraction Investigations of the Structure of Protein Molecules”, grant RG 1987, [changed to H-2143 (Chemistry 1950)], 1948-1958), Box #14.041, Folder #41.1]