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Yang X, Yuan L, Chen Z, Liu Z, Miao Q. A Trefoil Macrocycle Synthesized by 3-Fold Benzannulation. Org Lett 2018; 20:6952-6956. [DOI: 10.1021/acs.orglett.8b03099] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xuejin Yang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Luyan Yuan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Ziyi Chen
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Zhifeng Liu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Qian Miao
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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Kofman V, Witlox MJA, Bouwman J, Ten Kate IL, Linnartz H. A multifunctional setup to record FTIR and UV-vis spectra of organic molecules and their photoproducts in astronomical ices. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:053111. [PMID: 29864809 DOI: 10.1063/1.5027079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This article describes a new, multi-functional, high-vacuum ice setup that allows to record the in situ and real-time spectra of vacuum UV (VUV)-irradiated non-volatile molecules embedded in a low-temperature (10 K) amorphous solid water environment. Three complementary diagnostic tools-UV-visible (UV-vis) and Fourier Transform Infrared (FTIR) spectroscopy and temperature-programmed desorption quadrupole mass spectrometry-can be used to simultaneously study the physical and chemical behavior of the organic molecules in the ice upon VUV irradiation. The setup is equipped with a temperature-controlled sublimation oven that enables the controlled homogeneous deposition of solid species such as amino acids, nucleobases, and polycyclic aromatic hydrocarbons (PAHs) in ice mixtures prepared from precursor gases and/or liquids. The resulting ice is photo-processed with a microwave discharge hydrogen lamp, generating VUV radiation with a spectral energy distribution representative for the interstellar medium. The characteristics, performance, and future potential of the system are discussed by describing three different applications. First, a new method is introduced, which uses broadband interference transmission fringes recorded during ice deposition, to determine the wavelength-dependent refractive index, nλ, of amorphous solid water. This approach is also applicable to other solids, pure and mixed. Second, the UV-vis and FTIR spectroscopy of an VUV-irradiated triphenylene:water ice mixture is discussed, monitoring the ionization efficiency of PAHs in interstellar ice environments. The third and final example investigates the stability of solid glycine upon VUV irradiation by monitoring the formation of dissociation products in real time.
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Affiliation(s)
- V Kofman
- Sackler Laboratory for Astrophysics, Leiden Observatory, Leiden University, P.O. Box 9513, NL 2300 RA Leiden, The Netherlands
| | - M J A Witlox
- Fine Mechanical Department, Leiden Institute for Physics Research (LION), Niels Bohrweg 2, NL 2333 CA Leiden, The Netherlands
| | - J Bouwman
- Sackler Laboratory for Astrophysics, Leiden Observatory, Leiden University, P.O. Box 9513, NL 2300 RA Leiden, The Netherlands
| | - I L Ten Kate
- Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands
| | - H Linnartz
- Sackler Laboratory for Astrophysics, Leiden Observatory, Leiden University, P.O. Box 9513, NL 2300 RA Leiden, The Netherlands
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HIGH-RESOLUTION IR ABSORPTION SPECTROSCOPY OF POLYCYCLIC AROMATIC HYDROCARBONS IN THE 3μm REGION: ROLE OF PERIPHERY. ACTA ACUST UNITED AC 2016. [DOI: 10.3847/0004-637x/831/1/58] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Harthcock C, Zhang J, Kong W. Zero kinetic energy photoelectron spectroscopy of triphenylene. J Chem Phys 2014; 140:244308. [DOI: 10.1063/1.4884905] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Colin Harthcock
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Jie Zhang
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Wei Kong
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
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O'Connor GD, Bacskay GB, Woodhouse GVG, Troy TP, Nauta K, Schmidt TW. Excitation spectra of large jet-cooled polycyclic aromatic hydrocarbon radicals: 9-anthracenylmethyl (C15H11) and 1-pyrenylmethyl (C17H11). J Phys Chem A 2013; 117:13899-907. [PMID: 24079545 DOI: 10.1021/jp4088833] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The 9-anthracenylmethyl (C15H11) and 1-pyrenylmethyl (C17H11) radicals were identified by a combination of mass-resolved laser spectroscopy of a jet-cooled electrical discharge and quantum chemical methods. The 9-anthracenylmethyl radical was found to exhibit an origin band at 13757 cm(-1), with vibrational structure observed in a1 modes, and even quanta of b1 and a2 modes. The 1-pyrenylmethyl radical was found to exhibit an origin band at 13,417 cm(-1), with a more complex vibrational structure as compared to 9-anthracenylmethyl, on account of its lower symmetry and larger size. The origin bands of these species were predicted to within 250 cm(-1) by fitting a linear relationship between observed origin wavelengths of similar chromophores and the calculated TD-B3LYP transition energies. A refined fit including the title radicals provides estimated absorption energies for the larger 2-perylenylmethyl and 6-anthanthrenylmethyl species of 1.44 and 1.41 eV, respectively, with an estimated error of 30 meV.
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Kunishige S, Kawabata M, Baba M, Yamanaka T, Morita Y, Higashibayashi S, Sakurai H. Jet spectroscopy of buckybowl: electronic and vibrational structures in the S0 and S1 states of triphenylene and sumanene. J Chem Phys 2013; 139:044313. [PMID: 23901986 DOI: 10.1063/1.4816636] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Sumanene is a typical buckybowl molecule with C3v symmetry. We observed a fluorescence excitation spectrum and a dispersed fluorescence spectrum of sumanene in a supersonic jet. Bowl effects were clarified by comparing the spectra with those of triphenylene (D3h symmetry), which is a planar prototype of nonplanar sumanene. The S1 (1)A1 ← S0 (1)A1 transition is symmetry allowed. We found the 0(0)(0) band in the fluorescence excitation spectrum at 357.78 nm; this band was missing in the forbidden S1 (1)A1(') ← S0 (1)A1(') transition of triphenylene. The transition moment was shown to be along the oblate symmetric top axis (out of plane) by the observed rotational contour. A large number of vibronic bands were observed, unlike in triphenylene. Some were considered to be out-of-plane vibrational modes, which lead to a bowl-to-bowl inversion reaction assisted by in-plane vibrations. We found that the vibronic bands were markedly weak in the high energy region of triphenylene-d12. This indicates that the fluorescence quantum yield is very low at the high vibrational levels in the S1 state due to the rapid radiationless transition. The main process is considered to be internal conversion to the S0 state. The nonplanar structural distortion may also enhance radiationless transitions. We could not, however, observe weakening of the vibronic bands in the fluorescence excitation spectrum of sumanene.
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Affiliation(s)
- Sachi Kunishige
- Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Di Donato E, Vanzo D, Semeraro M, Credi A, Negri F. Tuning Fluorescence Lifetimes through Changes in Herzberg−Teller Activities: The Case of Triphenylene and Its Hexamethoxy-Substituted Derivative. J Phys Chem A 2009; 113:6504-10. [DOI: 10.1021/jp9005247] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eugenio Di Donato
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Davide Vanzo
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Monica Semeraro
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Alberto Credi
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Fabrizia Negri
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
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Callahan MP, Abo-Riziq A, Crews B, Grace L, de Vries MS. Isomer discrimination of polycyclic aromatic hydrocarbons in the Murchison meteorite by resonant ionization. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:1492-1495. [PMID: 18571977 DOI: 10.1016/j.saa.2008.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Accepted: 05/07/2008] [Indexed: 05/26/2023]
Abstract
We have used two-color resonant two-photon ionization (2C-R2PI) mass spectrometry to discriminate between isomers of polycyclic aromatic hydrocarbons in the Murchison meteorite. We measured the 2C-R2PI spectra of chrysene and triphenylene seeded in a supersonic jet by laser desorption. Since each isomer differs in its R2PI spectrum, we can distinguish between isomers using wavelength dependent ionization and mass spectrometry. We found both chrysene and triphenylene in sublimates from carbonaceous residue obtained by acid demineralization of the Murchison meteorite. Their R2PI mass spectra show only the molecular ion, even though these samples contain a complex inventory of organic molecules.
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Affiliation(s)
- Michael P Callahan
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA
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Bridgeman AJ. Modeling the Vibronic Spectra of Transition Metal Complexes: The Ligand-Field Spectrum of [PtCl4]2−. Inorg Chem 2008; 47:4817-25. [DOI: 10.1021/ic800091y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Adam J. Bridgeman
- School of Chemistry, Building F11, Eastern Avenue, The University of Sydney, NSW 2006, Australia
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