- Check from AHP to Sam Salisian for $30.49. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1954-February 1956), Box #4.023, Folder #23.1]
- Counter Receipt from Southern Commercial and Savings Bank for LP for $150.00. [Filed under LP Biographical: (Business and Financial: Bank Statements and Canceled Checks, December 1954-February 1956), Box #4.023, Folder #23.1]
- Handwritten note [in German] from Frau Berthel Heesch to AHP. [Filed under Ava Helen Pauling: (General Correspondence, Personal, A-M.), Box #1.001, Folder #1.2]
- Letter from Dr. L.J. Rather, Stanford University School of Medicine, RE: Thanks LP for his comments on Rather's proposed course. Seems that there is a very deep disagreement between LP and Rather. However, offers an excerpt from Antoine Lavoisier's Preface to Elements of Chemistry in support of his point of view. [Letters from LP to Rather November 23, 1955, December 6, 1955] [Filed under LP Correspondence: (R: Correspondence, 1955-1959), #341.1]
- Letter from LP to Dr. P.C. Dutta, Indian Association for the Cultivation of Science, RE: Has examined the manuscript by Hansa Raj Mehta which Dutta sent. Encloses a copy. Does not think that Mehta's discussion contains any significant new ideas. [Letter from Dutta to LP March 16, 1955] [Filed under LP Correspondence: (D: Correspondence, 1936-1959), #98.20]
- Letter from LP to Hansa Raj Mehta, Central Glass and Ceramic Research Institute, Calcutta, India. [Letter from LP to Dutta March 16, 1955] [Filed under LP Correspondence: (M: Correspondence, 1950-1955), #256.6]
29 November 1955
Mr. Hansa Raj Mehta
Central Glass and Ceramic Research Institute
Jadavpur, Calcutta 32
Dear Mr. Mehta:
I have read the manuscript that you prepared, and which was sent to me by Dr. Dutta, with much interest.
I have not been able to find anything in your manuscript that changes my opinion about the three-electron bond. This opinion is discussed in detail in my original paper on the three-electron bond, which was published in the Journal of the American Chemical Society, 53, 3325 (1931), and is also discussed in the corresponding chapter in my book. There is a sound quantum mechanical basis for the three-electron bond. It is known that a three-electron bond can be formed between two atoms by use of one orbital for each of the two atoms and of three electrons, and also that the energy of a three-electron bond is only about 60 percent as great as that of an electron pair bond. It is for this reason that the three-electron bond occurs so rarely. For example, a molecule for which a structure might be drawn involving two three-electron bonds should instead, in case that orbitals are available, be assigned a structure with a single bond and a double bond. A single bond and a double bond have about three times as much energy as a single bond alone, whereas two three-electron bonds have only 1.2 times the energy of a single bond. It is true that the single bond and the double bond require six atomic orbitals, whereas the two three-electron bonds require only four orbitals, and a molecule might be discovered in which only four orbitals are available. Nevertheless, this is a rare situation. For example, the structure that you have shown for the nitro group and the ozone molecule, involving two three-electron bonds, is much less stable than a structure in which one single bond and one double bond are shown, with, of course, resonance between the single bond and the double bond.
Now let us discuss the structure that you assign to naphthalene. In this structure there are ten three-electron bonds between carbon atoms, and one single bond. The conventional structures for naphthalene involve five double bonds and six single bonds. If you consider the energy of three-electron bonds, single bonds, and double bonds, you will find that your naphthalene structure is very unstable, relative to the others.
On the second page of your manuscript you give a long discussion of electronic structure in relation to the configuration of the nuclei of naphthalene. This discussion does not have significance because in fact electronic resonance occurs completely in the period of time required/ motion of the nuclei, as explained in the last chapter of my book.
The theory of the structure of aromatic and conjugated molecules has been pretty thoroughly developed by use of semi-empirical quantum mechanical methods, and the agreement between the results of calculations made by different methods (all of them being approximations to the solution of the Schrodinger equation for the molecule) is so good that there remains really no question about the electronic structure of these molecules. I do not think that there is any justification for attempting to introduce three-electron bonds in a discussion of their structure.
Perhaps I should mention one other point. In your paper you suggest a structure for nascent hydrogen. The idea that there exists a special form of hydrogen, nascent hydrogen, has been given up.
I should be pleased to have you write to me about any other ideas that you have.
cc: Dr. Dutta
- Letter from Stanley Schaefer, W.H. Freeman and Company, Publishers, to LP RE: Wonders if the McGraw-Hill contract gives LP the rights to take over the plates once the book is permitted to go out of print. Requests that LP contact McGraw-Hill to find out if the plates are available. [Letter from LP to Freeman November 4, 1955, January 18, 1956] [Filed under LP Books: (The Structure of Line Spectra), #1930b.6]
- Newspaper Clipping: "Right to Face Accusers and Know Charges is Upheld Again," Milwaukee (Wisconsin) Journal, November 29, 1955. [Filed under LP Newspaper Clippings: 1955n.37]