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In order to find out capable chemical evolution step from astronomicallycreated organic in interstellar space to biological organic on the earth,infrared spectrum of nitrogen substituted carbon pentagon-hexagon coupledpolycyclic aromatic hydrocarbon was analyzed by the density functional theory.Ionization was modeled from neutral to tri-cation. Among one nitrogen and twonitrogen substituted NPAH, we could find good examples showing similar IRbehavior with astronomically well observed one as like C8H6N1, C7H5N2, andC7H5N2. We can imagine that such ionized NPAH may be created in interstellarspace by attacks of high energy nitrogen and photon. Whereas, in case of threeand four nitrogen substituted cases as like C6H4N3 and C5H3N4, there were nocandidate showing similar behavior with observed one. Also, IR of typicalbiological organic with four and five nitrogen substituted one as like purineand adenine resulted no good similarity with observed one. By such theoreticalcomparison, one capable story of chemical evolution of PAH in interstellarspace was that one and two nitrogen substituted carbon pentagon-hexagonmolecules may have a potential to be created in interstellar space, whereasmore than three nitrogen substituted molecules including biological organicpurine and adenine may not be synthesized in space, possibly on the earth.

Nitrogen Substituted Polycyclic Aromatic Hydrocarbon As Capable  Interstellar Infrared Spectrum Source Considering Astronomical Chemical  Evolution Step To Biological Organic Purine And Adenine