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6. D. B. McCormick and H. Sigel, 'Discriminating behaviour of metal ions and ligands with regard to their biological significance', Accounts of Chemical Research, 3, 201, 1970. 7. C. A. Coulson, The Shape and Structure of Molecules, Clarendon Press, 1973. 34 2. 1 INTRODUCTION It is the purpose of this chapter to present an outline of the main structural facets of organic chemistry, particularly those which concern spatial relationships within molecules. The number of organic compounds known is so large that a systematic study of the structure and reactions (see chapter 4) is essential.

26). Outside these regions the pulse height (size) is proportional to the initial ionization produced, and, since rx. and fJ radiation produce different amounts of ionization, they will each produce a different pulse height. A further characteristic is that both types of radiation have separate plateaux. Such counting devices are called proportional counters. If the voltage applied to the electrodes is very high, then the electrons produced in the ionization chamber, as a result of radiation, are accelerated so much that when they strike the anode they produce emission of photons.

23(a). The remaining p orbitals would then project above and below the ring. They are then in an ideal position for multiple overlapping and multiple sharing of the six electrons they contain. This is shown in Fig. 23(b). The delocalization of the 1t orbitals produces a sandwich of electron charge distribution above and below the ring as shown in Fig. 23(c). 4). Another important group of unsaturated cyclic molecules in which there is extensive delocalization of a sextet of n electrons is in heterocyclic compounds.

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