FIGURE 5-9 p sheets are held together by hydrogen bonds, {a) A p steel is shown from above. Note that the oxygens and nitrogens of the backbone are fully hydrogen-bonded, (b) A p sheet shown from a side v»ew This illustrates the location of the side groups, which alternate between emerging from above ck below the plane of the p sheet (Source: Molecular structure adapted from Pauling L I960. The nature of the chemical bond and the structure of molecules and crystals. An introduction to modern structural chemistry, 3rd edition, p 501. Copyright © I960 Cornell University. Used by permission of the publisher)

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