In this paper a method is proposed to calculate diamagnetic susceptibilities of organic compounds. This method uses the extended Hückel formalism generalized to include the perturbation due to a magnetic field ℋ. Parameters are varied to obtain agreement with experimental results. The diamagnetic properties of the alkanes are examined and all the terms contributing to the susceptibility are analyzed. The importance of a coupling term between matrix elements of first order in ℋ and London terms is shown. Some results are discussed, particular to methane and the cycloalkanes.
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