Academic department under which the project should be listed

CSM - Chemistry and Biochemistry

Faculty Sponsor Name

Martina Kaledin

All students have completed CiTi training.

Abstract (300 words maximum)

N2…HCO+ and N2H+…OC are predicted to exist in interstellar clouds. These complexes involve HCO+ and N2H+ fragments that are bound to N2 and CO, respectively using hydrogen-bonded interaction. The reason these molecules are important is that the existence of nitrogen can be measured indirectly through ion-molecular complexes studied in this work. The measured vibrational spectra of molecules is an excellent way to characterize and detect molecules. We used B3LYP, MP2, and CCSD(T) computational methods to predict the structure and vibrational frequencies of N2…HCO+ and N2H+…OC and their fragments. The aug-cc-pVDZ and aug-cc-pVTZ basis sets were used. The stability of the complexes was described in terms of dissociations energies De and their zero-point energy (ZPE) corrected values, Do. Both molecular complexes exhibit a linear geometry. Vibrational frequencies were obtained using normal mode analysis. The N2H+…OC proton transfer vibrations occur at around 1800 – 1900 cm-1. H+ bound within HCO+ exhibit C-H vibration at ~2500-2700 cm-1. The N2…HCO+. complex is more stable than N2H+…OC by ~7000 cm-1. The ZPE corrected values for dissociation energies, Do for N2…HCO+ --> N2 + HCO+ and N2H+…OC --> N2H+ + OC are ~3500 cm-1 and ~5000 cm-1, respectively.

Project Type

Poster

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Probing structure and energetics of proton-bound complexes N2…HCO+ and N2H+…OC using computational chemistry methods

N2…HCO+ and N2H+…OC are predicted to exist in interstellar clouds. These complexes involve HCO+ and N2H+ fragments that are bound to N2 and CO, respectively using hydrogen-bonded interaction. The reason these molecules are important is that the existence of nitrogen can be measured indirectly through ion-molecular complexes studied in this work. The measured vibrational spectra of molecules is an excellent way to characterize and detect molecules. We used B3LYP, MP2, and CCSD(T) computational methods to predict the structure and vibrational frequencies of N2…HCO+ and N2H+…OC and their fragments. The aug-cc-pVDZ and aug-cc-pVTZ basis sets were used. The stability of the complexes was described in terms of dissociations energies De and their zero-point energy (ZPE) corrected values, Do. Both molecular complexes exhibit a linear geometry. Vibrational frequencies were obtained using normal mode analysis. The N2H+…OC proton transfer vibrations occur at around 1800 – 1900 cm-1. H+ bound within HCO+ exhibit C-H vibration at ~2500-2700 cm-1. The N2…HCO+. complex is more stable than N2H+…OC by ~7000 cm-1. The ZPE corrected values for dissociation energies, Do for N2…HCO+ --> N2 + HCO+ and N2H+…OC --> N2H+ + OC are ~3500 cm-1 and ~5000 cm-1, respectively.