= Solution
\b[Neither backbone has a partially filled, extended electronic band available for easy charge transport.] In <polysiloxanes> the bonding and nonbonding states are filled and separated from empty states by a large <band gap>. <phosphazene> local lone-pair interactions do not create the continuously delocalized, partially occupied pi band suggested by a naive P=N drawing. Their flexibility or formal multiple-bond notation does not imply electronic conductivity. This comparison concerns the undoped materials, not conductivity supplied by added mobile ions.
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