UV Photolysis of Quinoline in Interstellar Ice Analogs
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Laboratory Studies for Planetary Sciences
Laboratory Studies for Planetary Sciences A Planetary Decadal Survey White Paper Prepared by the American Astronomical Society (AAS) Working Group on Laboratory Astrophysics (WGLA) http://www.aas.org/labastro Targeted Panels: Terrestrial Planets; Outer Solar System Satellites; Small Bodies Lead Author: Murthy S. Gudipati Ice Spectroscopy Lab, Science Division, Mail Stop 183-301, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109. [email protected], 818-354-2637 Co-Authors: Michael A'Hearn - University of Maryland [email protected], 301-405-6076 Nancy Brickhouse - Harvard-Smithsonian Center for Astrophysics [email protected], 617-495-7438 John Cowan - University of Oklahoma [email protected], 405-325-3961 Paul Drake - University of Michigan [email protected], 734-763-4072 Steven Federman - University of Toledo [email protected], 419-530-2652 Gary Ferland - University of Kentucky [email protected], 859-257-879 Adam Frank - University of Rochester [email protected], 585-275-1717 Wick Haxton - University of Washington [email protected], 206-685-2397 Eric Herbst - Ohio State University [email protected], 614-292-6951 Michael Mumma - NASA/GSFC [email protected], 301-286-6994 Farid Salama - NASA/Ames Research Center [email protected], 650-604-3384 Daniel Wolf Savin - Columbia University [email protected], 212-854-4124, Lucy Ziurys – University of Arizona [email protected], 520-621-6525 1 Brief Description: The WGLA of the AAS promotes collaboration and exchange of knowledge between astronomy and planetary sciences and the laboratory sciences (physics, chemistry, and biology). -
) Synthesis of Quinoline and Derivatives1)
Faculty of Science Damietta University Chemistry Department An Essay on : Evaluation of the Synthesis, Reactions and Biological Activities of Quinolines _______________________________________________________________________ ____________________________________________________________ Presented BY MOHAMED ELNEKETY b.s.C student (special 2016 chemistry) Acknowledgment First my thank and gratitude to Allah I am greatly indebted to Prof.Dr : FAWZIA EL-ABLACK Professor of Organic Chemistry Chemistry Department Faculty of Science Damietta University To his supervision on my research. He taught me How to design a research plan and how to write it. I appreciate your help, guiding and encouragement. Again many thanks for what you have done for me. Fourth year Chemistry Department 2015 - 2016 Contents : Page Introduction..……………………………………..…………………….…..3 (1) Synthesis of Quinolines………………….………….…….…....5 1.1 Skraup reaction…………………………………………………..5 1.2 Combes quinoline synthesis…………………………….…….…6 1.3 Doebner reaction..………………………………..…….………..6 1.4 Doebner–Miller reaction …………………………….………….7 1.5 Knorr quinoline synthesis…………………………….…………7 1.6 Friedlaender Synthesis……………………………….………….8 1.7 Pfitzinger Synthesis………………………………….…………..8 1.8 Green preparation of quinolone……………………….……….9 1.9 Quinolines by Forming the N–C-2 Bond……………….……...11 1.10 From Aldehyde and Aniline……………………………………11 1.11 By condensation reaction of ortho-acylanilines and Alkenyl iodides…………………………………………….……12 1.12 By dehydrogenation of tetrahydroquinolines………….……..12 1.13 By cyclization of 2-ethynylanilines -
Computational Surface Modelling of Ices and Minerals of Interstellar Interest—Insights and Perspectives
minerals Review Computational Surface Modelling of Ices and Minerals of Interstellar Interest—Insights and Perspectives Albert Rimola 1,* , Stefano Ferrero 1, Aurèle Germain 2 , Marta Corno 2 and Piero Ugliengo 2,3 1 Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain; [email protected] 2 Dipartimento di Chimica, Università degli Studi di Torino, 10125 Torino, Italy; [email protected] (A.G.); [email protected] (M.C.); [email protected] (P.U.) 3 Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, 10125 Torino, Italy * Correspondence: [email protected]; Tel.: +34-93-581-3723 Abstract: The universe is molecularly rich, comprising from the simplest molecule (H2) to complex organic molecules (e.g., CH3CHO and NH2CHO), some of which of biological relevance (e.g., amino acids). This chemical richness is intimately linked to the different physical phases forming Solar-like planetary systems, in which at each phase, molecules of increasing complexity form. Interestingly, synthesis of some of these compounds only takes place in the presence of interstellar (IS) grains, i.e., solid-state sub-micron sized particles consisting of naked dust of silicates or carbonaceous materials that can be covered by water-dominated ice mantles. Surfaces of IS grains exhibit particular characteristics that allow the occurrence of pivotal chemical reactions, such as the presence of binding/catalytic sites and the capability to dissipate energy excesses through the grain phonons. The present know-how on the physicochemical features of IS grains has been obtained by the fruitful synergy of astronomical observational with astrochemical modelling and laboratory experiments. -
Interstellar Dust Within the Life Cycle of the Interstellar Medium K
EPJ Web of Conferences 18, 03001 (2011) DOI: 10.1051/epjconf/20111803001 C Owned by the authors, published by EDP Sciences, 2011 Interstellar dust within the life cycle of the interstellar medium K. Demyk1,2,a 1Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 2CNRS, IRAP, 9 Av. colonel Roche, BP. 44346, 31028 Toulouse Cedex 4, France Abstract. Cosmic dust is omnipresent in the Universe. Its presence influences the evolution of the astronomical objects which in turn modify its physical and chemical properties. The nature of cosmic dust, its intimate coupling with its environment, constitute a rich field of research based on observations, modelling and experimental work. This review presents the observations of the different components of interstellar dust and discusses their evolution during the life cycle of the interstellar medium. 1. INTRODUCTION Interstellar dust grains are found everywhere in the Universe: in the Solar System, around stars at all evolutionary stages, in interstellar clouds of all kind, in galaxies and in the intergalactic medium. Cosmic dust is intimately mixed with the gas-phase and represents about 1% of the gas (in mass) in our Galaxy. The interstellar extinction and the emission of diffuse interstellar clouds is reproduced by three dust components: a population of large grains, the BGs (Big Grains, ∼10–500 nm) made of silicate and a refractory mantle, a population of carbonaceous nanograins, the VSGs (Very Small Grains, 1–10 nm) and a population of macro-molecules the PAHs (Polycyclic Aromatic Hydrocarbons) [1]. These three components are more or less abundant in the diverse astrophysical environments reflecting the coupling of dust with the environment and its evolution according to the physical and dynamical conditions. -
Nitroaromatic Antibiotics As Nitrogen Oxide Sources
Review biomolecules Nitroaromatic Antibiotics as Nitrogen Oxide Sources Review Allison M. Rice, Yueming Long and S. Bruce King * Nitroaromatic Antibiotics as Nitrogen Oxide Sources Department of Chemistry and Biochemistry, Wake Forest University, Winston-Salem, NC 27101, USA; Allison M. Rice , Yueming [email protected] and S. Bruce (A.M.R.); King [email protected] * (Y.L.) * Correspondence: [email protected]; Tel.: +1-336-702-1954 Department of Chemistry and Biochemistry, Wake Forest University, Winston-Salem, NC 27101, USA; [email protected]: Nitroaromatic (A.M.R.); [email protected] antibiotics (Y.L.) show activity against anaerobic bacteria and parasites, finding * Correspondence: [email protected]; Tel.: +1-336-702-1954 use in the treatment of Heliobacter pylori infections, tuberculosis, trichomoniasis, human African trypanosomiasis, Chagas disease and leishmaniasis. Despite this activity and a clear need for the Abstract: Nitroaromatic antibiotics show activity against anaerobic bacteria and parasites, finding usedevelopment in the treatment of new of Heliobacter treatments pylori forinfections, these conditio tuberculosis,ns, the trichomoniasis, associated toxicity human Africanand lack of clear trypanosomiasis,mechanisms of action Chagas have disease limited and their leishmaniasis. therapeutic Despite development. this activity Nitroaro and a clearmatic need antibiotics for require thereductive development bioactivation of new treatments for activity for theseand this conditions, reductive the associatedmetabolism toxicity can convert -
Electron Density Studies on Quinoline Analogs of N,N'-Dimcthy\-P- Phenylazoaniline
[CANCER RESEARCH 30, 2089-2090, August 1970] Electron Density Studies on Quinoline Analogs of N,N'-Dimcthy\-p- phenylazoaniline Ellis V. Brown and William H. Kipp Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506 SUMMARY azobenzenes. The K for the addition of 1 proton to the quinolinium salt would be determined (designated pKfl). The This paper continues the study of the relationship between amino nitrogen of the quinolinium salt would be quater- electron density and carcinogenic activity for compounds nized, and then the K for the addition of a proton to the azo related to p-dimethylaminoazobenzene (Cancer Res., 29: nitrogen in the presence of 2 positive charges would be 1341-1344, 1969) and reports on the seven p-dimethyl- determined. It would then be possible to determine KT, aminophenylazoquinolines. A relationship was found pKam, and pKaz in the manner described in the previous between carcinogenic activity and the pKfl of the amino paper (Chart 1). nitrogen in these compounds, and in this new series a H relationship also was found for carcinogenic activity and the *;]-«•I pKa of the azo nitrogen. INTRODUCTION CH, C-H N -N=NC,H.N(CH,), ^=îiC_H,N - N' - "UC,H,N (CH, ) We have previously reported (2) on the resolution of KT y o o 4 J ¿ y o o 4 J ¿ into pKam and pKaz for a series of alkyl derivatives of AVV-dimethyl-p-phenylazoaniline. KT is the tautomerie a2 equilibrium between the aniline nitrogen and the azo nitro gens in 20% ethanol-sulfuric acid solution described by Isak's and Jaffe (5). -
Interstellar Ice Photochemistry and the Deuterium Enrichment and Chemical Properties of Meteoritic Polycyclic Aromatic Hydrocarbons S
63rd Annual Meteoritical Society Meeting 5003.pdf INTERSTELLAR ICE PHOTOCHEMISTRY AND THE DEUTERIUM ENRICHMENT AND CHEMICAL PROPERTIES OF METEORITIC POLYCYCLIC AROMATIC HYDROCARBONS S. A. Sandford1, M. P. Bernstein1,2, L. J. Allamandola1, J. S. Gillette3, and R. N. Zare3, 1NASA-Ames Research Center, MS 245-6, Moffett Field CA 94035 ([email protected]), 2SETI Institute, 2035 Landings Drive, Mountain View CA 94043, USA, 3Department of Chemistry, Stanford University, Stanford CA 94305, USA. Introduction: Polycyclic aromatic hydrocarbons surroundings over time. However, exchanged D atoms (PAHs) are known to be abundant and ubiquitous in at the other sites are labile only under UV irradiation; the interstellar medium (ISM) [1]. At the temperatures once irradiation ceases these atoms will not exchange typical of dense interstellar molecular clouds (T = 10–- with the environment. 50 K), the birth sites of stars and planetary systems, Because the aromatic fractions of meteoritic PAHs will be frozen out of the gas phase into icy grain organics are known to be enriched in deuterium [6], mantles. These mantles contain a number of molecular this raises the possibility that interstellar species, the most abundant being H2O, CH3OH, CO, photoprocessing of PAHs in D-enriched interstellar CO2, NH3, CH 4, and possibly N2 and O2 [2]. Many of ices has occurred [7]. The measured D/H ratios of these molecules are expected to be enriched in interstellar ices [8] and the observed exchange rates for deuterium via a number of interstellar chemical coronene (C 24H12)-D2O and d12-coronene (C24D12)-H2O processes [2]. While frozen in these D-enriched ices, isotopic substitution experiments show that PAHs in the PAHs will be exposed to ultraviolet photons from interstellar ices could easily attain the D/H levels nearby stars, the attenuated diffuse ISM radiation field, observed in meteorites [7]. -
Infrared Observations of Interstellar Ices
Infrared Observations of Interstellar Ices Adwin Boogert NASA Herschel Science Center IPAC, Caltech Pasadena, CA, USA 05 June 2012 Interstellar Dust School (Cuijk): Interstellar Ices (Boogert) 1 Scope ●Lecture 1 (Monday): What you need to know when planning, reducing, or analyzing infrared spectroscopic observations of dust and ices. ●Lecture 2 (Tuesday): Basic physical and chemical information derived from interstellar ice observations. Not discussed: laboratory techniques (see Palumbo lectures) and surface chemistry (see Cuppen lectures). ●Lecture 3 (Tuesday): Infrared spectroscopic databases. What's in them and how (not) to use them. ●Drylabs (Tuesday): Using databases of interstellar infrared spectra and of laboratory ices. Deriving ice abundances and analyzing ice band profiles. NOTE: Please download all presentations and drylab tar file: spider.ipac.caltech.edu/~aboogert/Cuijk/ 05 June 2012 Interstellar Dust School (Cuijk): Interstellar Ices (Boogert) 2 Topics ●Basics ● Ice mantle formation ● Deriving ice column densities and abundances ●YSO and background source selection ●Continuum determination ●Vibrational modes ●The interstellar ice inventory ●Ice band profile analysis: ● Polar versus apolar ices ● Amorphous versus crystalline ices ● Segregation in the ices ● Grain size and shape effects ●Location of ices ●Processing of ices by YSOs ●Complex molecules in ices? 05 June 2012 Interstellar Dust School (Cuijk): Interstellar Ices (Boogert) 3 Background Reading ● For the basics: Dust in the galactic environment, 2nd ed. by D.C.B. Whittet. Bristol: Institute of Physics (IOP) Publishing, 2003 Series in Astronomy and Astrophysics, ISBN 0750306246. ● More advanced: Chapter 10 in “The Physics and Chemistry of the Interstellar Medium”, A. G. G. M. Tielens, ISBN 0521826349. Cambridge, UK: Cambridge University Press, 2005. -
Heterocyclic Chemistrychemistry
HeterocyclicHeterocyclic ChemistryChemistry Professor J. Stephen Clark Room C4-04 Email: [email protected] 2011 –2012 1 http://www.chem.gla.ac.uk/staff/stephenc/UndergraduateTeaching.html Recommended Reading • Heterocyclic Chemistry – J. A. Joule, K. Mills and G. F. Smith • Heterocyclic Chemistry (Oxford Primer Series) – T. Gilchrist • Aromatic Heterocyclic Chemistry – D. T. Davies 2 Course Summary Introduction • Definition of terms and classification of heterocycles • Functional group chemistry: imines, enamines, acetals, enols, and sulfur-containing groups Intermediates used for the construction of aromatic heterocycles • Synthesis of aromatic heterocycles • Carbon–heteroatom bond formation and choice of oxidation state • Examples of commonly used strategies for heterocycle synthesis Pyridines • General properties, electronic structure • Synthesis of pyridines • Electrophilic substitution of pyridines • Nucleophilic substitution of pyridines • Metallation of pyridines Pyridine derivatives • Structure and reactivity of oxy-pyridines, alkyl pyridines, pyridinium salts, and pyridine N-oxides Quinolines and isoquinolines • General properties and reactivity compared to pyridine • Electrophilic and nucleophilic substitution quinolines and isoquinolines 3 • General methods used for the synthesis of quinolines and isoquinolines Course Summary (cont) Five-membered aromatic heterocycles • General properties, structure and reactivity of pyrroles, furans and thiophenes • Methods and strategies for the synthesis of five-membered heteroaromatics -
Gudipati Keck Comet Physical and Chemical Composition of Comet
Present Understanding of Comet Nucleus Physical and Chemical Composition Murthy S. Gudipati Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 Keck Study – Comet – June 5, 2017 Outline Comet – Physical Composition Comet - Chemical Composition Comet – History 2 Comet – Physical Composition Physical Composition of Comets 3 Comet Physical Composition Gas (Volatiles, now Super Volatiles) Dust (Silicate Grains) Water (in the form of Ice – major component) The Elephant in the Room: How these three components are put together in a comet’s nucleus? 4 Porosity Science, 349, aab0639, 2015 Dust/Ice = 0.4 – 2.6 Porosity = 75 -85% Enrichment of Dust Regions and vice versa? Dust = Carbonaceous Chondrites (high percentages of water & organics; silicates, oxides, sulfides, olivine, serpentine, etc.) 5 Density Icarus 277 (2016) 257–278 Density = 532 ± 7 kg m−3 Crystalline water-ice = 920 kg m−3 Amorphous water-ice = ~500 - 800 kg m−3 Carbonaceous chondrites = ~3 to 3.7 kg m−3 6 Thermal Inertia Science, 349, aab0464, 2015 Thermal Inertia:85±35 J m-2K-1s-1/2 Thermal gradient? How Deep to reach <30 K? 7 Surface Science, 349, aaa9816, 2015 ~20 cm granular (soft) Below hard crust How thick is the crust – cm range or m range? 8 Simultaneous UV & IR Absorption + Fluorescence Pyrene in H2O Ice UV - PAH IR - Ice Flu - PAH Lignell & Gudipati J. Phys. Chem A. 119 (2015) 2607 9 Are Comets Like Deep Fried Ice Cream? ~0.1 m Comet CG/67P Lignell & Gudipati J. Phys. Chem A. 119 (2015) 2607 10 Comet – Chemical Composition Chemical Composition of Comets 11 Composition of Interstellar Medium At 1 atm. -
H2O Ice Mixtures with CH3OH and NH3 in the Far-IR Region B
A&A 592, A81 (2016) Astronomy DOI: 10.1051/0004-6361/201628324 & c ESO 2016 Astrophysics Interstellar ice analogs: H2O ice mixtures with CH3OH and NH3 in the far-IR region B. M. Giuliano1; 4, R. Martín-Doménech1, R. M. Escribano2, J. Manzano-Santamaría1; 3, and G. M. Muñoz Caro1 1 Centro de Astrobiología, INTA-CSIC, Carretera de Ajalvir, km 4, Torrejón de Ardoz, 28850 Madrid, Spain e-mail: [email protected] 2 Instituto de Estructura de la Materia-Consejo Superior de Investigaciones Científicas (IEM-CSIC), 28006 Madrid, Spain 3 Dept. de Matemática Aplicada, Ciencia e Ingeniería de Materiales, ESCET, Universidad Rey Juan Carlos. C/ Tulipán s/n, Móstoles 28933 Madrid, Spain 4 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany Received 17 February 2016 / Accepted 29 May 2016 ABSTRACT Context. New spectroscopic observations in the far-infrared (IR) range are expected from future planned missions. Although water ice is the only species detected so far in interstellar ices in this range, the presence of ice mixtures requires laboratory characterization of the corresponding spectra. Aims. We present an investigation on far-IR spectra of binary ice mixtures relevant in various astrophysical environments. The fore- most goal is to compare the spectroscopic features of the ice mixtures to those of pure ices, and to search for changes in peak frequencies, intensities, and band strengths of the main bands. Methods. Mixtures H2O:CH3OH and H2O:NH3 of different ratios have been deposited on a diamond substrate at astrophysically relevant conditions. We measured the spectra in the near- and mid-IR regions to derive ice column densities that were subsequently used to calculate the apparent band strengths in the far-IR region. -
Polycyclic Aromatic Hydrocarbons As Plausible Prebiotic Membrane Components
Polycyclic Aromatic Hydrocarbons as Plausible Prebiotic Membrane Components Joost Groen, David W. Deamer, Alexander Kros & Pascale Ehrenfreund Origins of Life and Evolution of Biospheres The Journal of the International Astrobiology Society ISSN 0169-6149 Volume 42 Number 4 Orig Life Evol Biosph (2012) 42:295-306 DOI 10.1007/s11084-012-9292-3 1 23 Your article is published under the Creative Commons Attribution license which allows users to read, copy, distribute and make derivative works, as long as the author of the original work is cited. You may self- archive this article on your own website, an institutional repository or funder’s repository and make it publicly available immediately. 1 23 Orig Life Evol Biosph (2012) 42:295–306 DOI 10.1007/s11084-012-9292-3 PREBIOTIC CHEMISTRY Polycyclic Aromatic Hydrocarbons as Plausible Prebiotic Membrane Components Joost Groen & David W. Deamer & Alexander Kros & Pascale Ehrenfreund Received: 21 May 2012 /Accepted: 21 June 2012 / Published online: 15 July 2012 # The Author(s) 2012. This article is published with open access at Springerlink.com Abstract Aromatic molecules delivered to the young Earth during the heavy bombardment phase in the early history of our solar system were likely to be among the most abundant and stable organic compounds available. The Aromatic World hypothesis suggests that aromatic molecules might function as container elements, energy transduction elements and templat- ing genetic components for early life forms. To investigate the possible role of aromatic molecules as container elements, we incorporated different polycyclic aromatic hydrocar- bons (PAH) in the membranes of fatty acid vesicles. The goal was to determine whether PAH could function as a stabilizing agent, similar to the role that cholesterol plays in membranes today.