Glycine structural classification

Later the MINDO/2 CO calculation was repeated for the two-dimensional parallel-chain pleated sheet / -polyglycine network (two glycine molecules in the unit cell) using second neighbours interactions.101 These resulted in values of 6ev 1.2 eV, 6ec 1.7 eV and a forbidden band width of 4.8 eV. It should be mentioned that while in the case of the polyformamide we had planar structures and could therefore define n- and -electron bands (in both cases the valence band was a n- and the conduction band a parallel-chain pleated sheet conformation of / -polyglycine because it is not planar. 

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