Production of N<sub>3</sub> upon Photolysis of Solid Nitrogen at 3 K with Synchrotron Radiation

Recent results in prebiotic chemistry implicate hydrogen cyanide (HCN) as the source of carbon and nitrogen for the synthesis of nucleotide, amino acid and lipid building blocks. HCN can be produced during impact events by reprocessing of carbonaceous and nitrogenous materials from both the impactor and the atmosphere; it can also be produced from these materials by electrical discharge. Here we investigate the effect of high energy events on a range of starting mixtures representative of various atmosphere-impactor volatile combinations. Using continuously scanning time–resolved spectrometry, we have detected ·CN radical and excited CO as the initially most abundant products. Cyano radicals and excited carbon monoxide molecules in particular are reactive, energy-rich species, but are resilient owing to favourable Franck–Condon factors. The subsequent reactions of these first formed excited species lead to the production of ground-state prebiotic building blocks, principally HCN.

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“…N radical is very reactive species 53 . It can be assumed that this particle reacts with a ∙CH 3 radical produced by C–H homolysis of methane:…”

Section: Resultsmentioning

confidence: 99%

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth

Ferus

Kubelík

Knížek

et al. 2017

Sci Rep

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“…1 A . According to previous work (14), the formation of threshold wavelength for N ( 2 D) and l -N 3 from the icy N 2 is 145.6 nm, 8.52 eV, as Eq. 1 .normalN2(normalX)+normalN2(normalX)+hv→N(normalD2)+lnormal-N3(normalX2normalΠnormalg)λth=145.6 nm.Generation of N ( 2 D) and l -N 3 could occur and the emission from the excited N ( 2 D) hence appeared upon 121.6 nm as displayed in Fig.…”

Section: Icy N2 Upon 1216-nm Illuminationmentioning

confidence: 94%

“…The first excited state, A, of N 2 has a long lifetime, on the order seconds (9), and seems to serve as a steppingstone of energy for further reactions, or an energy reservoir to transfer its energy to its surroundings (10–13). Although the lowest resonance absorption of N 2 is the Lyman–Birge–Hopfield system (9), for a N 2 ice at 145.6 nm (8.52 eV) (14), the measured threshold of emission for A → X, the Vegard–Kaplan system (VK) (9), extends to 175 nm (7.08 eV) (15). With this steppingstone in state A, the dissociation barrier of icy N 2 becomes greatly decreased; the important evidence is that emission from the photofragment N ( 2 D → 4 S) (16, 17) has a threshold energy of 8.52 eV (18).…”

mentioning

confidence: 99%

Thermal reaction and luminescence of long-lived N ² D in N ₂ ice

Lo¹,

Chou²,

Peng³

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceN2 is present as ice in cold outer space. In this work, photochemical experiments with concurrent detection of infrared absorption and visible emission spectra provide evidence for the generation of energetic products N 2D atom and l-N3 radical after photolysis of icy N2 with vacuum-ultraviolet radiation. We found that the photolysis of icy N2 may also produce the long-lived N 2Dlong atom which can be triggered to release emission or to induce the synthesis of l-N3 upon raising of the temperature. This work enhances our understanding of the transformation of nitrogen species in cold astroenvironments; the results also open a window into photochemical processes in solid state.

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“…In order to determine the binding modes of the ligands, 2-aminobenzonitrile and octanoate ion to copper(II) in the complex, FT-IR spectra of free ligands were compared with copper(II) complex. The 2-aminobenzonitrile shows in characteristic absorption bands in the 3433 cm −1 , 3388 cm −1, and 2206 cm -1 region, assignable to asymmetric, symmetric stretching frequencies of ν(NH 2 ) and ν(C≡N) respectively 19,20 . A small band noticed at 3040 cm −1 is due to aryl ν(CH).…”

Section: Ft-ir Spectramentioning

confidence: 99%

Untitled

2019

IJPSR

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A novel coordination complex of 2-aminobenzonitrile (ABN) and octanoate ion (OC) with Cu(II) metal ion has been prepared by using microwave irradiation. The molecular formula and the geometry of the complex have been deduced from elemental analysis, molar conductance, magnetic moment, electronic spectra, FT-IR spectra, cyclic voltammetry, thermal analysis and EPR spectra. The molar conductance value indicates that the complex is nonelectrolyte (1:0) type. The electronic spectrum and the magnetic moment indicate the geometry of the complex is octahedral. FT-IR spectra show that 2aminobenzonitrile is coordinated to the metal ion in a bidentate and octanoate ion in a monodentate manner. The metal-ligand covalency of Cu(II) complex has been arrived at from EPR spectrum. The antimicrobial activities of ligands and their Cu(II) complex were studied against the microorganisms, viz., staphylococcus aureus, streptococcus, Klebsiella, pseudomonas aeruginosa, salmonella typhi, Enterobacter, E. coli, C. albicans, Aspergillus flavus and Aspergillus niger by agar-well diffusion method. The complex shows potential activity against the bacteria and fungi as compared to the free ligands. The free radical scavenging activity of the complex and the ligands have been determined by measuring their interaction with the stable free radical DPPH. The complex has larger antioxidant activity as compared to the ligands. The DNA-binding properties of the free ligand ABN and its Cu(II) complex have been investigated by fluorescence measurements. The results suggest that ABN and its Cu(II) complex both bind to DNA via an intercalative binding mode and the affinity for DNA is more strong in case of Cu(II) complex when compared with ABN.

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Production of N₃ upon Photolysis of Solid Nitrogen at 3 K with Synchrotron Radiation

Cited by 28 publications

References 18 publications

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth

Thermal reaction and luminescence of long-lived N ² D in N ₂ ice

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Production of N3 upon Photolysis of Solid Nitrogen at 3 K with Synchrotron Radiation

Cited by 28 publications

References 18 publications

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth

Thermal reaction and luminescence of long-lived N 2 D in N 2 ice

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Production of N₃ upon Photolysis of Solid Nitrogen at 3 K with Synchrotron Radiation

Thermal reaction and luminescence of long-lived N ² D in N ₂ ice