Relevant bibliographies by topics / Heterocyclic ions

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Heterocyclic ions'

Author: Grafiati
Published: 24 April 2022

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Journal articles on the topic "Heterocyclic ions"

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Li, Chongyang, Yongli Huang, Chang Q. Sun, and Lei Zhang. "Acidic Stabilization of the Dual-Aromatic Heterocyclic Anions." Catalysts 11, no. 7 (June 24, 2021): 766. http://dx.doi.org/10.3390/catal11070766.

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Recently, we discovered that the delocalization of nitrogen lone-pair electrons (NLPEs) in five-membered nitrogen heterocycles created a second σ-aromaticity in addition to the prototypical π-aromaticity. Such dual-aromatic compounds, such as the pentazole anion, were proved to have distinct chemistry in comparison to traditional π-aromatics, such as benzene, and were surprisingly unstable, susceptible to electrophilic attack, and relatively difficult to obtain. The dual-aromatics are basic in nature, but prefer not to be protonated when confronting more than three hydronium/ammonium ions, which violates common sense understanding of acid−base neutralization for a reason that is unclear. Here, we carried out 63 test simulations to explore the stability and reactivity of three basic heterocycle anions (pentazole anion N5¯, tetrazole anion N4C1H1¯, and 1,2,4-triazole anion N3C2H2¯) in four types of solvents (acidic ions, H3O+ and NH4+, polar organics, THF, and neutral organics, benzene) with different acidities and concentrations. By quantum mechanical calculations of the electron density, atomistic structure, interatomic interactions, molecular orbital, magnetic shielding, and energetics, we confirmed the presence of dual aromaticity in the heterocyclic anions, and discovered their reactivity to be a competition between their basicity and dual aromaticity. Interestingly, when the acidic ions H3O+/NH4+ are three times more in number than the basic heterocyclic anions, the anions turn to violate acid−base neutralization and remain unprotonated, and the surrounding acidic ions start to show a significant stabilization effect on the studied heterocyclic anions. This work brings new knowledge to nitrogen aromatics and the finding is expected to be adaptable for other pnictogen five-membered ring systems.
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Schmid, Dirk, Denis Bubrin, Daniela Förster, Martin Nieger, Eric Roeben, Sabine Strobel, and Dietrich Gudat. "Unsymmetrically substituted N-heterocyclic phosphenium ions." Comptes Rendus Chimie 13, no. 8-9 (August 2010): 998–1005. http://dx.doi.org/10.1016/j.crci.2010.04.020.

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Frisch, Philipp, and Shigeyoshi Inoue. "NHC-stabilized silyl-substituted silyliumylidene ions." Dalton Transactions 48, no. 28 (2019): 10403–6. http://dx.doi.org/10.1039/c9dt02010a.

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Estrada, Jess, and Vincent Lavallo. "Fusing Dicarbollide Ions with N‐Heterocyclic Carbenes." Angewandte Chemie International Edition 56, no. 33 (August 7, 2017): 9906–9. http://dx.doi.org/10.1002/anie.201705857.

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Estrada, Jess, and Vincent Lavallo. "Fusing Dicarbollide Ions with N‐Heterocyclic Carbenes." Angewandte Chemie 129, no. 33 (July 17, 2017): 10038–41. http://dx.doi.org/10.1002/ange.201705857.

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Sousa, Rui P. C. L., Raquel C. R. Gonçalves, Susana P. G. Costa, Rita B. Figueira, and Maria Manuela M. Raposo. "Heterocyclic Aldehydes Based on Thieno[3,2-b]thiophene Core: Synthesis and Preliminary Studies as Ion Optical Chemosensors." Cells 3, no. 1 (November 13, 2020): 88. http://dx.doi.org/10.3390/ecsoc-24-08092.

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Heterocyclic aldehydes show a variety of optical properties and the versatility of their reactivity allows them to yield a wide range of more complex compounds, with application in areas such as medicinal, materials and supramolecular chemistry. The biological and environmental relevance of certain molecules and ions turns them into targets for the design of molecular recognition systems. Recently, heterocyclic aldehydes have been reported in the literature as ion chemosensors. Following the group’s work on optical chemosensors, for the detection and quantification of ions and molecules with environmental and medicinal relevance, this work reports the synthesis and characterization of two heterocyclic aldehydes based on the thieno[3,2-b]thiophene core, by Suzuki coupling, as well as the synthesis of the corresponding precursors. Preliminary chemosensory studies for the synthesized heterocyclic aldehydes in the presence of selected cations were also performed, in solution, in order to determine their potential application as optical chemosensors.
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Frisch, Philipp, and Shigeyoshi Inoue. "Coinage metal complexes of NHC-stabilized silyliumylidene ions." Chemical Communications 54, no. 97 (2018): 13658–61. http://dx.doi.org/10.1039/c8cc07754a.

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Valdés-Martı́nez, Jesús, James H. Alstrum-Acevedo, Rubén A. Toscano, Simón Hernández-Ortega, Georgina Espinosa-Pérez, Douglas X. West, and Brian Helfrich. "Tetrachlorocuprate(II) salts of heterocyclic aminoguanidonium (guanylhydrazonium) ions." Polyhedron 21, no. 4 (March 2002): 409–16. http://dx.doi.org/10.1016/s0277-5387(01)01006-3.

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Someya, Chika I., Shigeyoshi Inoue, Carsten Präsang, Elisabeth Irran, and Matthias Driess. "Formation of N-heterocyclic, donor-stabilized borenium ions." Chemical Communications 47, no. 23 (2011): 6599. http://dx.doi.org/10.1039/c1cc11789k.

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Novak, Michael, Lulu Xu, and Rebecca A. Wolf. "Nitrenium Ions from Food-Derived Heterocyclic Arylamine Mutagens." Journal of the American Chemical Society 120, no. 7 (February 1998): 1643–44. http://dx.doi.org/10.1021/ja974222h.

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Dissertations / Theses on the topic "Heterocyclic ions"

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Silva, Vignoli Muniz Gabriel. "Irradiation of aromatic heterocyclic molecules at low temperature : a link to astrochesmistry." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC214/document.

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Cette thèse porte sur l’étude de la radio-sensibilité de Molécules AromatiquesHétérocycliques (MAH) à basse température exposées à une irradiation avec des ionslourds rapides. La présence de ces molécules dans les météorites carbonées sur Terre estune forte indication pour l’existence de cette catégorie de molécules dans l’espace.L’objectif de ce travail est de simuler l’effet des rayons cosmiques sur des MAH enphase solide et d’estimer leur résistance à l’irradiation. Les lignes de faisceaux deGANIL et de GSI permettent de simuler cet effet. L’évolution des MAH en phase solidea été monitorée par spectroscopie infrarouge à transformée de Fourier. Cela permet dequantifier la destruction des MAH, de déterminer leur section efficace de destruction etde détecter les molécules produites. Les sections efficaces de destruction de l’adénine etde la cytosine suivent une loi puissance en fonction du pouvoir d’arrêt électronique :σd~ Se1.2. Les nouvelles bandes d’absorption observées après l’irradiation des MAH sontprincipalement attribuées à des nitriles (R-C≡N), des isonitriles (R-N≡C) et (R-C≡C).L’évolution de la section efficace en fonction du pouvoir d’arrêt électronique a permisd’estimer la durée de vie de l’adénine dans l’espace : (14×106) années. Ces résultatspermettront de comprendre la stabilité et la chimie de ces molécules complexes dansl’espace
The thesis concerns the study of the radio sensitivity of aromatic heterocyclic molecules(AHMs) at low temperature (12 K) exposed to swift heavy ion radiation. The presenceof aromatic heterocyclic molecules in carbonaceous meteorites on Earth is a strongindication that this class of molecules exists in outer space.The aim of this work was to study the effects of cosmic ray analogues on solid AHMsand to estimate their survival under radiation. The beam lines of GANIL and GSI allowto simulate the effects of cosmic rays in AHMs. The evolution of the solid AHMs underirradiation was monitored by Fourier transformed infrared absorption spectroscopy; thisallows to quantify the disappearance of AHMs, to determine their apparent destructioncross section and to detect their radioproducts. Furthermore, it was found that adenineand cytosine destruction cross sections (σd) follow a power law with the electronicenergy loss: σd~ Se1.2 .New IR absorption peaks arising from the AHMs degradationswere observed; these peaks can be attributed to nitriles (R-C≡N), isonitriles (R-N≡C),and (R-C≡C).The observed power law allowed the estimation of the lifetime of adeninein space exposed to galactic cosmic rays as (14×106) years. These findings may help tounderstand the stability and chemistry related to complex organic molecules in space
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Moore, Adam L. "N-heterocyclic carbenes with pendant arylamine donor substituents as supports for metal-metal interactions of closed shell metal ions." abstract, 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3326620.

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Melaiye, Abdulkareem M. "Synthesis and Antimicrobial Properties of Silver(I) N-Heterocyclic Carbene Complexes." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1124310734.

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Collett, Christopher J. "Mechanistic studies of azolium ions and their role in organocatalysis." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3868.

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This thesis describes our physical organic and mechanistic investigations into N Heterocyclic Carbene (NHC) mediated organocatalytic transformations, through a collaboration with the research group of Dr AnnMarie O'Donoghue and PhD student Richard Massey at Durham University. Initial research focused upon the determination of kinetic acidities and associated pKₐ values for a range of triazolium salts using C(3) H/D exchange, monitored by ¹H NMR spectroscopy. Estimates for pKₐ values in the range 16.6 17.4 were obtained, which are some ~2 and ~3 5 pK units lower than analogous imidazolium and thiazolium species respectively, with modest N substituent (0.3 pK units) effects observed. At lower pD values, an altered pD dependence indicates a dicationic triazolium species is formed (through N(1) protonation) with an estimated pKₐᴺ¹ of -0.2-0.5 and C(3) H pKₐ values at least 2 units lower than their monocationic analogues. This methodology was subsequently extended to mesoionic NHCs, where pKa values of 23.0 27.1 for a range of triazolium and 30.2 31.0 for a range of imidazolium salts were estimated. A detailed study of the NHC catalysed intramolecular Stetter reaction was also undertaken using ¹H NMR spectroscopy. A range of 3 (hydroxybenzyl)azolium salts (adducts), formed from the addition of NHC to aldehyde were isolated, enabling the generation of reaction profiles and the determination of rate constants. The reaction proceeds via rapid and reversible adduct generation, followed by rate limiting Breslow intermediate formation, with electron withdrawing N aryl substituents increasing the rate of product formation. Consistent with rate limiting deprotonation, deuterium exchange studies of O methylated adduct analogues found electron withdrawing N-aryl units gave faster exchange. Examination of the equilibrium constants for adduct formation revealed that both in the case of NHCs bearing 2,6 disubstituted N aryl units and aldehydes bearing a 2 ether substituent, the equilibrium position is significantly shifted towards adduct. Finally, studies at sub-stoichiometric NHC concentrations, monitored by HPLC, imply the reaction is first order with respect to NHC precursor, but zero order in aldehyde, again indicative of rate limiting deprotonation.
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Veerman, Johannes Jacobus Nicolaas. "Novel parallel synthesis routes to nitrogen heterocycles via N-acyliminium ions." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/64476.

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Sokmen, Munevver. "Studies of the metal ion-catalysed oxidation of heterocyclic sulfur compounds." Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/20384/.

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Chemical oxidation by hydrogen peroxide is used for the treatment of hazardous organic materials present at low concentrations in contaminated soil and water. A knowledge of the oxidation of thiophene and its derivatives, with particular reference to oxidative destruction and the identification of intermediate oxidation products would be useful for a deeper understanding of reaction mechanisms in waste treatment and the optimization of conditions. In this thesis, the oxidation of thiophenes, namely thiophene and 2- and 3-methylthiophene, with hydrogen peroxide and catalyst systems, e.g. Fenton's reagent, Gif systems and titanium dioxide-assisted photocatalytic oxidations, all of which may involve the formation of free radicals, e.g. the hydroxyl radical (HO-), has been studied. Fenton-related catalyst systems, mixtures of iron salts (and sometimes also with copper salts) and hydrogen peroxide, have been suggested in the literature and their reactions with thiophenes have been investigated. Additionally, other catalytic systems that have also been suggested in the literature as having potential have been studied. The oxidation of thiophene derivatives with Fenton-like reagents involving a combinations of hydrogen peroxide with other metal salts including vanadium(IV), titanium(III), copper(I) and copper(II) have been explored, since all of these systems appear to form hydroxyl radicals. Further Fenton-related oxidations of reaction intermediates have been carried out in order to help understand whether the oxidation products described are derived directly from the original compound or from further oxidation of a reaction intermediate. The progress of the oxidation reactions was followed by chromatographic analysis, using Gas Chromatography-Mass Spectrometry and High Performance Liquid Chromatography, so as to establish the nature of the oxidation products and the possible reaction pathways. Components of the mixtures were identified by comparison with commercially available products or synthetic standards. Oxidation reactions were monitored over set time intervals and the amounts of residual thiophenes were determined. In all of the oxidation reactions investigated, Fenton-related and Fenton-like, heteroaromatic ring destruction was observed, together with the formation of small amounts of hydroxylated ring products and dimeric structures. The oxidative destruction of thiophenes was successfully achieved with the above catalyst systems in the presence of excess hydrogen peroxide. Recent literature has questioned the formation of hydroxyl radicals in Fenton-related systems, and in order to contribute to the debate regarding the oxidizing species responsible for the destruction of each of the thiophenes, the oxidation reactions have been carried out in the presence of a complexing agent such as ethylenediaminetetraacetic acid (EDTA), and a radical trapping reagent 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), respectively. Evidence of radical trapping was observed. Gif chemistry may involve the formation of high oxidation state iron complexes rather than free radicals. The oxidation of thiophenes was carried out using Fenton's reagent under Gif conditions and the results were compared with those from conventional Fenton and related conditions, to determine whether free radical species are involved in the latter. Radical derived products were again observed. Titanium-catalysed photooxidation has also formed part of this study to determine the nature of intermediate products which might be similar to those from Fenton-catalysed systems. For these reasons, the photocatalytic oxidation of 2-methylthiophene was studied in aqueous solution and the reaction was conducted in the presence and absence of titanium dioxide under an oxygen atmosphere. A similar range of radical derived products was found as in the conventional Fenton and related systems.
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Granitzka, Markus. "Aggregation Study on Lithiated Five-membered Heterocycles – Towards the Pentuple Ion." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E0A-C.

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Zahid, Abdul. "Nitrogen heterocycles by tandem cationic cyclisation-aziridinium ion formation-nucleophilic ring opening." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426848.

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Knipe, Peter Clarke. "Chiral counter-ion controlled asymmetric electrocyclic reactions." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:c981f724-c783-4913-b224-92fcebf94d37.

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The aim of this project was to develop new catalytic methods to control asymmetry in electrocyclic reactions, and to apply these methods to generate complex molecules. Initial efforts were directed towards the catalysis of anionic 8π electrocyclizations (Chapter 2 and Figure i). 8π electrocyclization was not achieved due to issues with alkene geometry and anion stability. Our efforts were then directed towards using phase-transfer catalysis to generate complex polycyclic compounds via a cascade electrocyclization-1,4-addition (Chapter 3 and Figure ii). Pyrrolidines and indolizidines were generated in excellent yield from simple starting-materials with high levels of stereocontrol. Finally, we investigated the catalysis of a 6π [1,6] electrocyclization to generate dihydroquinolones (Chapter 4 and Figure iii). A novel BINOL-derived copper(II) catalyst was developed, and afforded dihydroquinolones directly from their amine and aldehyde precursors with good yields and enantioselectivities.
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Diantouba, Bertin Aimé. "Effets structuraux des acyl-4-pyrazolones-5 dans l'extraction liquide-liquide des cations metalliques divalents." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13093.

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Etude de l'effet de l'acidite de la lipophilie et effets structuraux des acyl-4 pyrazolones-5 dans l'extraction de cu, co, zu et pb divalents. Extraction de 3 types de complexes metalliques : mononucleaires de type m(l-n-lh)::(2) ou m(l-n-l) et polynucleaires (m(l-n-l))::(j). Meilleures possibilites des bis-acyl-4 pyrazolones-5
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Book chapters on the topic "Heterocyclic ions"

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Joule, J. A., K. Mills, and G. F. Smith. "Typical reactivity of pyrylium and benzopyrylium ions, pyrones and benzopyrones." In Heterocyclic Chemistry, 146–47. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-3222-8_7.

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Davies, A. G. "17.10.4 Radical cations of aromatic and heterocyclic sulphur compounds." In Phosphorus-Centered Radicals, Radicals Centered on Other Heteroatoms, Organic Radical Ions. Part 2, 552–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-87641-0_54.

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Santamaría, Javier, and Carlos Valdés. "Six-Membered Rings with One Oxygen: Pyrylium Ion, Related Systems and Benzo-Derivatives." In Modern Heterocyclic Chemistry, 1631–82. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527637737.ch18.

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Gale, Philip A., and Chang-Hee Lee. "Calix[n]pyrroles as Anion and Ion-Pair Complexants." In Topics in Heterocyclic Chemistry, 39–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/7081_2010_30.

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La-Venia, Agustina, Pilar Ventosa-Andrés, and Viktor Krchňák. "Peptidomimetics via Iminium Ion Chemistry on Solid Phase: Single, Fused, and Bridged Heterocycles." In Topics in Heterocyclic Chemistry, 105–26. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/7081_2015_194.

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Joule, J. A., K. Mills, and G. F. Smith. "Typical reactivity of pyrylium and benzopyrylium ions, pyrones and benzopyrones." In Heterocyclic Chemistry, 146–47. CRC Press, 2020. http://dx.doi.org/10.1201/9781003072850-7.

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Dunne, Aideen, Enrica Pascarella, and Mike Casey. "Natural Product Synthesis Using Cyclisations of Iodonium Ions." In 19th International Congress on Heterocyclic Chemistry, 283. Elsevier, 2003. http://dx.doi.org/10.1016/b978-0-08-044304-1.50275-6.

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Lukesh, Julie M., Patrick B. Greer, Luping Liu, and William A. Donaldson. "Synthesis of C-Glycoside Containing Natural Products via Oxocarbenium Ions." In 19th International Congress on Heterocyclic Chemistry, 145. Elsevier, 2003. http://dx.doi.org/10.1016/b978-0-08-044304-1.50137-4.

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Mathey, F. "Phospholide Ions." In Fully Unsaturated Small-Ring Heterocycles and Monocyclic Five-Membered Hetarenes with One Heteroatom, 1. Georg Thieme Verlag KG, 2001. http://dx.doi.org/10.1055/sos-sd-009-00693.

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Tokitoh, N., and W. Ando. "Thiirenium Ions." In Fully Unsaturated Small-Ring Heterocycles and Monocyclic Five-Membered Hetarenes with One Heteroatom, 1. Georg Thieme Verlag KG, 2001. http://dx.doi.org/10.1055/sos-sd-009-00037.

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Conference papers on the topic "Heterocyclic ions"

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Witwit, Israa N., Husham M. Hasan Mubark, and Abid Allah M. Ali. "Synthesis and studying the coordination behavior of a new heterocyclic imidazole azo ligand with some of the first series transition and (IIB) ions." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0027445.

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Raposo, Maria, Rosa Batista, and Susana Costa. "UV-vis Spectroscopic Characterization of Heterocyclic Azines as Chemosensors for Metal Ion Detection in Aqueous Medium." In The 18th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecsoc-18-b005.

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Reports on the topic "Heterocyclic ions"

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Ozekin, K., R. D. Noble, and C. A. Koval. A theoretical analysis of the extraction of heterocyclic organic compounds from an organic phase using chemically mediated electrochemically modulated complexation in ion exchange polymer beads. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6181074.

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