Pernigraniline base is the first Peierls degenerate ground state polymer beyond trans- polyacetylene. It is similar to trans- polyacetylene in that is sustains neutral and charged solitons and charged polarons as photoexcitations. Pernigraniline base differs substantially from trans- polyacetylene in that photoexcited neutral solitons are stable for long times for temperatures below 150 K and that at high photoexcitation densities, photoexcited neutral solitons are stable, even at room temperature. The origin of this anomalous behavior is attributed to the central role of ring rotations and interchain interactions in the system.