Littérature scientifique sur le sujet « Tetra phenyl porphyrins »
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Articles de revues sur le sujet "Tetra phenyl porphyrins"
Ion, R. M., A. Planner, K. Wiktorowicz et D. Frackowiak. « The incorporation of various porphyrins into blood cells measured via flow cytometry, absorption and emission spectroscopy. » Acta Biochimica Polonica 45, no 3 (30 septembre 1998) : 833–45. http://dx.doi.org/10.18388/abp.1998_4279.
Texte intégralScheldt, W. Robert, Beisong Cheng, Allen G. Oliver et John A. Goodwin. « Solid-state porphyrin interactions with oppositely charged peripheral groups ». Journal of Porphyrins and Phthalocyanines 19, no 12 (décembre 2015) : 1256–61. http://dx.doi.org/10.1142/s1088424615501084.
Texte intégralION, Chim Rodica-Mariana, et Cristina MANDRAVEL. « THE PHOTODEGRADATION REACTION OF SOME PORPHYRINS ». SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 5, no 5 (20 décembre 1997) : 111–29. http://dx.doi.org/10.48141/sbjchem.v5.n5.1997.109_1997.pdf.
Texte intégralGeorge, Reama Chinedu, Nkem Torimiro, Oluwafemi Bamidele Daramola et Afusat Ajoke Olajide. « Zinc, Tin and Silver Porphyrins (TPP, TCPP, TMPP, THPP, TPPS, TMPyP) as photosensitizers in antibacterial photodynamic therapy for chronic wounds : A screening study ». Ethiopian Journal of Science and Technology 15, no 2 (1 juin 2022) : 187–207. http://dx.doi.org/10.4314/ejst.v15i2.6.
Texte intégralLi, Yang, Hannah M. Rhoda, Anthony M. Wertish et Victor N. Nemykin. « Organometallic pyrene-containing porphyrins : Synthesis, characterization, and non-covalent interactions with C60 fullerenes ». Journal of Porphyrins and Phthalocyanines 20, no 08n11 (août 2016) : 1098–113. http://dx.doi.org/10.1142/s1088424616500735.
Texte intégralAlemohammad, Tahereh, Nasser Safari et Samira Osati. « Effect of hydrogen bonding on catalytic activity of some manganese porphyrins in epoxidation reactions ». Journal of Porphyrins and Phthalocyanines 15, no 03 (mars 2011) : 181–87. http://dx.doi.org/10.1142/s1088424611003094.
Texte intégralHALVORSEN, INGAR, ERIK STEENE et ABHIK GHOSH. « Resonance Raman marker bands of β-octahalogeno-meso-tetraarylmetalloporphyrins ». Journal of Porphyrins and Phthalocyanines 05, no 10 (octobre 2001) : 721–30. http://dx.doi.org/10.1002/jpp.378.
Texte intégralShen, Liang, Xiaomei Wang, Bo Li, Wanli Jiang, Ping Yang, Shixiong Qian, Xutang Tao et Minhua Jiang. « Two-photon absorption properties of substituted porphyrins ». Journal of Porphyrins and Phthalocyanines 10, no 03 (mars 2006) : 160–66. http://dx.doi.org/10.1142/s1088424606000193.
Texte intégralSu, Qiwen, et Tamara D. Hamilton. « Extending mechanochemical porphyrin synthesis to bulkier aromatics : tetramesitylporphyrin ». Beilstein Journal of Organic Chemistry 15 (22 mai 2019) : 1149–53. http://dx.doi.org/10.3762/bjoc.15.111.
Texte intégralNasrollahi, Rahele, et Saeed Zakavi. « Kinetics and mechanistic studies on the formation and reactivity of high valent MnO porphyrin species : mono-ortho or para-substituted porphyrins versus a di-ortho-substituted one ». New Journal of Chemistry 42, no 3 (2018) : 1806–15. http://dx.doi.org/10.1039/c7nj04233g.
Texte intégralThèses sur le sujet "Tetra phenyl porphyrins"
Panighel, Mirco. « Adsorption, metalation and magnetic properties of tetra phenyl porphyrins on metal surfaces ». Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10898.
Texte intégralTraditional semiconductor technology will reach a size limit within the next few years. A possible solution could be the use of organic molecules in technological applications as single functional units in metal-organic based devices; the success of this approach strongly depends on the understanding of the behaviour of these molecules on metallic surfaces. The interaction with metallic substrates and the interaction between the molecules themselves determine the electronic and magnetic properties of the system, and it is thus of fundamental interest to study these metal-organic interfaces both in the case of single molecules and layer structures. In this thesis, an extensive study of the electronic and magnetic properties of tetra-phenyl-porphyrin (2H-TPP) molecules adsorbed on metal surfaces is reported. By means of scanning tunnelling microscopy (STM) we studied the adsorption geometry of these molecules on the Au(111), Ag(111) and Cu(100) surfaces. By using X-ray photoemission spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, a temperature-induced conformational adaptation reaction of the 2H-TPP molecules adsorbed on the Au(111) and Ag(111) surfaces, upon annealing at 550 K, is described. A possible dehydrogenation reaction, with the formation of new C-C bonds, could explain the rotation of the molecule phenyl rings parallel to the surface plane and the associated increasing in the molecule-substrate interaction. In-situ metalation of porphyrins in ultra-high vacuum is obtained by two methods: in the first one, the metalation of 2H-TPP on Ag(111) is achieved by direct metal evaporation (Mn, Rh and Fe) on the molecular layer; in the second case we report the self-metalation of 2H-TPP through the coordination with a metal atom from the Fe(110) and Al(111) substrates. In addition, we investigated the effects of metalation and temperature-induced conformational adaptation on the molecule-substrate interaction, by means of XPS and NEXAFS, in the case of CoTPP on Ag(111). The magnetic properties resulting from the metal coordination are studied by X-ray magnetic circular dichroism (XMCD). Here, a description of the magnetic coupling of a MnTPPCl single layer with a Fe(110) ferromagnetic substrate is disclosed. Moreover, we focused on the study of the magnetic properties and exchange coupling of two layer of molecule and a ferromagnetic thin film. In the case of a MnTPP layer on FeTPP/Fe(110) the magnetic coupling extends to the second layer of molecules, for which the magnetization is opposite with respect to the substrate.
Le tradizionali tecnologie utilizzate nell’industria dei semiconduttori raggiungeranno, entro breve tempo, il limite nella miniaturizzazione dei loro componenti. Una possibile alternativa potrebbe venire dall’utilizzo di molecole organiche come singole unità funzionali in dispositivi metallo-organici; d’altra parte il successo di questo approccio dipende in maniera sostanziale dalla comprensione del comportamento di queste molecole sulle superfici dei metalli. L’interazione con il substrato metallico e la stessa interazione tra le molecole determinano le proprietà elettroniche e magnetiche di questi sistemi, ed è dunque di fondamentale interesse lo studio di queste interfacce metallo-organiche sia nel caso di singole molecole che di strutture più complesse. In questa tesi è riportato uno studio dettagliato delle proprietà elettroniche e magnetiche di tetra-fenil-porfirine (2H-TPP) adsorbite su superfici metalliche. Attraverso la microscopia a scansione a effetto tunnel (STM) è stata studiata la geometria di adsorbimento di queste molecole sulle superfici Au(111), Ag(111) e Cu(100). Utilizzando le spettroscopie XPS (X-ray photoemission spectroscopy) e NEXAFS (near-edge X-ray absorption fine structure) è descritta la reazione di adattamento conformazionale delle 2H-TPP adsorbite sulle superfici Au(111) e Ag(111) a seguito del processo di annealing a 550 K. Una possibile reazione di de-idrogenazione, con la formazione di nuovi legami C-C, può spiegare la rotazione dei gruppi fenili della molecola verso la superficie e l’aumento dell’interazione molecola-substrato ad esso associato. La metallazione in-situ delle porfirine in ultra-alto vuoto è ottenuta in due modi: nel primo, la metallazione delle 2H-TPP su Ag(111) è raggiunta con la diretta evaporazione del metallo (Mn, Rh e Fe) sullo strato di molecole; nel secondo caso, sulle superfici Fe(110) e Al(111) la metallazione avviene automaticamente tramite la coordinazione della 2H-TPP con un atomo della superficie. Inoltre, gli effetti della metallazione e dell’adattamento conformazionale sull’interazione molecola-substrato sono stati studiati, tramite XPS e NEXAFS, nel caso di CoTPP su Ag(111). Le proprietà magnetiche risultanti dalla coordinazione della molecola con un atomo metallico sono state studiate per mezzo della tecnica XMCD (X-ray magnetic circular dichroism). In particolare, viene descritto l’accoppiamento magnetico di un singolo strato di MnTPPCl con un substrato ferromagnetico Fe(110). Inoltre, ci si è focalizzati sullo studio delle proprietà magnetiche tra due strati di molecole e un film sottile ferromagnetico. Nel caso specifico di MnTPP su FeTPP/Fe(110) l’accoppiamento magnetico si estende al secondo strato di molecole, per il quale la magnetizzazione è opposta rispetto al substrato.
XXVII Ciclo
1986
Houwaart, Torsten. « Cobalt porphyrins on coinage metal surfaces - adsorption and template properties ». Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0927.
Texte intégralThis thesis is a theoretical study on the cobalt porphyrin - coinage metal surface interface with the DFT code VASP. The necessary DFT framework has been introduced in chapter 1. The structure of the Java program jBardeen for STM simulation is explained in chapter 2 and the source code is attached as Appendix. A study of the adsorption of CoTPP on coinage metal surfaces has been undertaken in chapter 3. Different parameters of the calculation have been evaluated: the adsorption site and the geometry of both the molecule and surface have been investigated with respect to the xc-functional and dispersion correction used. A most stable adsorption site -bridge down- is identified. Consequently, this most stable site was investigated for its electronic structure. Calculated STM images with the jBardeen code were compared with an experiment of CoTPP on a Cu(111) surface with sub monolayer coverage. In chapter 4 an Fe adatom was introduced to the CoTPP on Ag(111) system. Three symmetrically different binding sites for the Fe atom were identified on the macrocycle, labelled the bi-, brd- and bru-positions for bisector, bridge down and bridge up respectively. A magnetic moment could be evidenced which was mainly located on the Fe atom. Possible pathways between the four symmetrically equivalent bisector sites were investigated with different methods. Single point calculations in vacuum and Nudged Elastic Band (NEB) of the whole system revealed a barrier height of slightly above 0.2 eV going from bi- to the brd-position. A vibrational analysis showed that switching of the Fe atom is likely, when perturbed out of equilibrium in the brd- and bru- positions
Chapitres de livres sur le sujet "Tetra phenyl porphyrins"
Chaudhuri, Rupali, et K. K. Rohatgi Mukherjee. « Singlet and Triplet State Emission Studies on Zinc Tetra Phenyl Porphyrin Encapsulated Liposomes ». Dans Photosynthesis : from Light to Biosphere, 375–78. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_89.
Texte intégralActes de conférences sur le sujet "Tetra phenyl porphyrins"
Margetić, Davor, Ronald Warrener, David Mann, Douglas Butler et Zhi-Long Chen. « Dipolarophylic Properties of 5,10,15,20-tetra-(3,5-di(tert-butyl)phenyl)porphyrin-2,3-dione ». Dans The 8th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2004. http://dx.doi.org/10.3390/ecsoc-8-01945.
Texte intégralTONEZZER, M., A. QUARANTA, E. NEGRO, G. DELLA MEA, G. MAGGIONI et S. CARTURAN. « A COMPARISON BETWEEN OPTICAL GAS SENSING CAPABILITIES OF VACUUM EVAPORATED AND SPIN COATED TETRA PHENYL-PORPHYRIN THIN FILMS ». Dans Proceedings of the 10th Italian Conference. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812833532_0033.
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