Infrared Spectra of Protonated Phenanthridine (C<sub>13</sub>H<sub>9</sub>NH<sup>+</sup>) and Isomers of Monohydrogenated Phenanthridine (C<sub>13</sub>H<sub>9</sub>NH and 1-, 2-, 7-, 9-, and 10-HC<sub>13</sub>H<sub>9</sub>N) Isolated in Solid Para-Hydrogen.
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ABSTRACT: Laboratory infrared (IR) spectra of protonated or hydrogenated polycyclic aromatic nitrogen heterocycles offer valuable insights for identifying potential carriers of interstellar unidentified infrared (UIR) emission. We report the IR spectra of protonated phenanthridine (5-phenanthridinium cation, C13H9NH+), its neutral radical counterpart (5-phenanthridinyl radical, C13H9NH), and additional monohydrogenated phenanthridine, produced via the electron bombardment of a mixture of phenanthridine (C13H9N) in excess para-hydrogen (p-H2) during matrix deposition at 3.2 K. Complementary experiments involving ultraviolet/IR irradiation of a C13H9N/Cl2/p-H
SUBMITTER: Yang ML
PROVIDER: S-EPMC12670388 | biostudies-literature | 2025 Nov
REPOSITORIES: biostudies-literature
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