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Elewa M, Maltar-Strmečki N, Said MM, El Shihawy HA, El-Sadek M, Frank J, Drescher S, Drescher M, Mäder K, Hinderberger D, Imming P. Synthesis and EPR-spectroscopic characterization of the perchlorotriarylmethyl tricarboxylic acid radical (PTMTC) and its 13C labelled analogue (13C-PTMTC). Phys Chem Chem Phys 2018; 19:6688-6697. [PMID: 28210718 DOI: 10.1039/c6cp07200c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hydrophilic tris(tetrachlorotriaryl)methyl (tetrachloro-TAM) radical labelled 50% with 13C at the central carbon atom was prepared. The mixture of isotopologue radicals was characterised by continuous wave and pulsed X-band electron paramagnetic spectroscopy (EPS). For the pharmaceutical and medical applications planned, the quantitative influence of oxygen, viscosity, temperature and pH on EPR line widths was studied in aqueous buffer, DMSO, water-methanol and water-glycerol mixtures. Under in vivo conditions, pH can be disregarded. There is a clear oxygen dependence of the width of the 12C isotopologue single EPR line in aqueous solutions while changes in rotational motion (viscosity) are observable only in the doublet lines of the central carbon of the 13C isotopologue. The tetrachloro-TAM proved to be very stable as a solid. Its thermal decay was determined quantitatively by thermal annealing. Towards ascorbic acid as a reducing agent and towards an oocyte cell extract it had a half-life of approx. 60 and 10 min. Thus for in vivo applications, 50% 13C tetrachloro-TAMs are suitable for selective and simultaneous oxygen and macroviscosity measurements in a formulation, e.g. nanocapsules.
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Affiliation(s)
- Marwa Elewa
- Institut für Pharmazie, Martin-Luther-Universität Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle, Germany. and Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Nadica Maltar-Strmečki
- Institut für Chemie, Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle, Germany.
| | - Mohamed M Said
- Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | | | | | - Juliane Frank
- Institut für Pharmazie, Martin-Luther-Universität Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle, Germany.
| | - Simon Drescher
- Institut für Pharmazie, Martin-Luther-Universität Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle, Germany.
| | - Malte Drescher
- Department of Chemistry and Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Karsten Mäder
- Institut für Pharmazie, Martin-Luther-Universität Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle, Germany.
| | - Dariush Hinderberger
- Institut für Chemie, Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle, Germany.
| | - Peter Imming
- Institut für Pharmazie, Martin-Luther-Universität Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle, Germany.
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González-Cobos J, Rico VJ, González-Elipe AR, Valverde JL, de Lucas-Consuegra A. Electrochemical activation of an oblique angle deposited Cu catalyst film for H2 production. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01524j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A novel Cu catalyst film was prepared by oblique angle physical vapour deposition (OAD) on a K-βAl2O3 solid electrolyte (alkaline ionic conductor) for catalytic/electrocatalytic purposes.
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Affiliation(s)
- Jesús González-Cobos
- Department of Chemical Engineering
- School of Chemical Sciences and Technology
- University of Castilla-La Mancha
- 13005 Ciudad Real
- Spain
| | - Víctor J. Rico
- Laboratory of Nanotechnology on Surface
- Institute of Materials Science of Sevilla (CSIC-Uni. Sevilla)
- 41092 Sevilla
- Spain
| | - Agustín R. González-Elipe
- Laboratory of Nanotechnology on Surface
- Institute of Materials Science of Sevilla (CSIC-Uni. Sevilla)
- 41092 Sevilla
- Spain
| | - José L. Valverde
- Department of Chemical Engineering
- School of Chemical Sciences and Technology
- University of Castilla-La Mancha
- 13005 Ciudad Real
- Spain
| | - Antonio de Lucas-Consuegra
- Department of Chemical Engineering
- School of Chemical Sciences and Technology
- University of Castilla-La Mancha
- 13005 Ciudad Real
- Spain
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Mas-Torrent M, Crivillers N, Rovira C, Veciana J. Attaching persistent organic free radicals to surfaces: how and why. Chem Rev 2011; 112:2506-27. [PMID: 22188381 DOI: 10.1021/cr200233g] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Marta Mas-Torrent
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain.
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Miyoshi Y, Takahashi K, Fujimoto T, Yoshikawa H, Matsushita MM, Ouchi Y, Kepenekian M, Robert V, Donzello MP, Ercolani C, Awaga K. Crystal structure, spin polarization, solid-state electrochemistry, and high n-type carrier mobility of a paramagnetic semiconductor: vanadyl tetrakis(thiadiazole)porphyrazine. Inorg Chem 2011; 51:456-62. [PMID: 22168463 DOI: 10.1021/ic201880g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the synthesis, crystal structure, and magnetic, electrochemical, and carrier-transport properties of vanadyl tetrakis(thiadiazole)porphyrazine (abbreviated as VOTTDPz) with S = ½. X-ray crystal analysis reveals two polymorphs, the α and β forms; the former consists of a 1D regular π stacking, while the latter forms a 2D π network. Molecular orbital calculations suggest a V(4+)(d(1)) ground state and a characteristic spin polarization on the whole molecular skeleton. The temperature dependence of the paramagnetic susceptibility of the α form clearly indicates a ferromagnetic interaction with a positive Weiss constant of θ = 2.4 K, which is well-explained by McConnell's type I mechanism. VOTTDPz forms amorphous thin films with a flat and smooth surface, and their cyclic voltammogram curves indicate a one-electron reduction process, which is highly electrochromic, because of a reduction of the porphyrazine π ring. Thin-film field-effect transistors of VOTTDPz with ionic-liquid gate dielectrics exhibit n-type performance, with a high mobility of μ = 2.8 × 10(-2) cm(2) V(-1) s(-1) and an on/off ratio of 10(4), even though the thin films are amorphous.
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Affiliation(s)
- Yasuhito Miyoshi
- Department of Chemistry & Research Center for Materials Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
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Datcu A, Roques N, Jubera V, Maspoch D, Fontrodona X, Wurst K, Imaz I, Mouchaham G, Sutter JP, Rovira C, Veciana J. Three-Dimensional Porous Metal-Radical Frameworks Based on Triphenylmethyl Radicals. Chemistry 2011; 18:152-62. [DOI: 10.1002/chem.201102278] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Revised: 10/05/2011] [Indexed: 11/09/2022]
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