Linus Pauling and The Nature of the Chemical Bond: A Documentary History Narrative  
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The Seventh Paper
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All of chemistry was now re-forming itself in Pauling's mind. Like a jazz musician, he was taking themes suggested by quantum mechanics and improvising on them, drawing from his growing library of known molecular structures (much of it from his own x-ray crystallographic studies) and guides like Pauling’s Rules and the electronegativity scale. His was a new kind of chemistry that played in the spaces between the old categories. Pauling's quantum chemistry was not either/or: either this or that orbital, either ionic or covalent bonds, either single or double links. Pauling's chemical bond was a fluid, multiform thing that often resonated between different forms. This was exciting, beautiful chemical music, and he was the first to play it.

The last in his chemical bond series, "The Nature of the Chemical Bond VII. The calculation of resonance energy in conjugated systems," again written with Jack Sherman and published at the end of 1933, demonstrated the power of Pauling’s unique approach. In it, he explored a range of conjugated systems (molecules in which double and single bonds alternate in a hydrocarbon chain — examples include a number of biochemical compounds like the carotenes and lycopene) and aromatic groups. Pauling and Sherman concluded the paper with a set of rules for the structures and properties of conjugated systems.

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See Also: "Report on Wave Mechanics, Slater’s Theory of Complex Spectra." April 1932. 
See Also: "Halogen Oxides." December 11, 1932. 

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Jack Sherman and Linus Pauling. 1935.

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"The nature of the chemical bond. VII. The calculation of resonance energy in conjugated systems." July 3, 1933.

"I remember clearly how much different my own thinking about molecular structure and the chemical bond was in 1935 from what it had been ten years earlier. In 1925...I had no way of distinguishing between the good ideas and the poor ideas about the electronic structure of molecules."

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