Abstract
The effect of substituents on the
electrical conductivity of some crystalline anils of salicylaldehyde is
reported. A correlation exists between specific conductivity (log K) and the
Hammett substituent constant (σ) for both the meta and para series of
substituents, and between the activation energy of conduction (Δє) and σ for the para series. In each case
the relationship between conductivity and temperature can be described by the
equation K = K0exp(-Δє/2kT).��� Certain current questions as to the validity
of measurements ~f electrical resistivities of polycrystalline pellets and of
the application of band theory considerations to organic crystals are
discussed.
The effect of chelating Schiff bases with
divalent metal ions is to lower the conductivity considerably. Copper(II)
chelates are less conductive than the corresponding nickel(II) chelates. The
conductivity of the anils increases abruptly by several orders of magnitude at
the melting point, and Δєc values
appropriate to the super- cooled liquids are much lower than the solid state
values.
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