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Cosmic infrared emission and absorption spectra often carry a well-definedand invariant 6.2 micron band that has been proposed to emanate from very smalldust grains that may carry polyaromatic hydrocarbons. Hemoglycin, awell-defined polymer of glycine that also contains iron, has been found inmeteorites of the primordial CV3 class and therefore originated in the solarprotoplanetary disc. In approximate calculations, the principal amide Iinfrared absorption band of hemoglycin is at 6.04 microns. Hemoglycin, anantiparallel beta sheet structure with two 11-mer glycine chains, has an exactstructural analog in antiparallel poly-L-lysine beta sheets which in thelaboratory have an absorption peak at 6.21 microns. This wavelengthcoincidence, the demonstrated propensity of hemoglycin 4.9nm rods to formaccreting lattice structures, and its proven existence in the solarprotoplanetary disc strongly suggest that the cosmic 6.2 micron emission andabsorption could be from small grains that are hemoglycin lattices orshell-like vesicles carrying internal organic molecules of various types.Calculated hemoglycin ultraviolet absorptions associated with iron in themolecule match the observed ultraviolet extinction feature at nominal 2175Angstroms.

Polymer amide as a source of the cosmic 6.2 micron emission and absorption