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Hattori Y, Tsubaki S, Matsuoka R, Kusamoto T, Nishihara H, Uchida K. Expansion of Photostable Luminescent Radicals by Meta-Substitution. Chem Asian J 2021; 16:2538-2544. [PMID: 34270166 DOI: 10.1002/asia.202100612] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/15/2021] [Indexed: 11/12/2022]
Abstract
Polychlorinated pyridyldiphenylmethyl radicals having substituents meta to the position bearing the carbon-centered radical (α-carbon) are synthesized. All of them are stable in ambient conditions in solutions and fluorescent in cyclohexane. The fluorescence of the radicals with bromo, phenyl, 4-chlorophenyl, or 2-pyridyl substituents are enhanced in chloroform, while the emission of the radicals with 2-thienyl or 2-furyl substituents are quenched in chloroform. DFT and TD-DFT calculations indicate that the first doublet excited states of the former are locally excited, while the first doublet excited states of the latter are charge transfer states from the π-electron-donating substituent to the accepting radical. The latter also show much higher photostability under 370-nm light irradiation compared with the first reported photostable fluorescent radical, (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical (PyBTM), with pronounced bathochromic shifts of the fluorescence.
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Affiliation(s)
- Yohei Hattori
- Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University, Seta, Otsu, Shiga, 520-2194, Japan
| | - Shunsuke Tsubaki
- Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University, Seta, Otsu, Shiga, 520-2194, Japan
| | - Ryota Matsuoka
- Department of Life and Coordination-Complex Molecular Science, Instite for Molecular Science, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan
| | - Tetsuro Kusamoto
- Department of Life and Coordination-Complex Molecular Science, Instite for Molecular Science, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan
| | - Hiroshi Nishihara
- Research Institute for Science and Technology, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Kingo Uchida
- Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University, Seta, Otsu, Shiga, 520-2194, Japan
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2
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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: 9] [Impact Index Per Article: 1.5] [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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Boś-Liedke A, Walawender M, Woźniak A, Flak D, Gapiński J, Jurga S, Kucińska M, Plewiński A, Murias M, Elewa M, Lampp L, Imming P, Tadyszak K. EPR Oximetry Sensor-Developing a TAM Derivative for In Vivo Studies. Cell Biochem Biophys 2017; 76:19-28. [PMID: 28871484 PMCID: PMC5913390 DOI: 10.1007/s12013-017-0824-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 08/14/2017] [Indexed: 12/11/2022]
Abstract
Oxygenation is one of the most important physiological parameters of biological systems. Low oxygen concentration (hypoxia) is associated with various pathophysiological processes in different organs. Hypoxia is of special importance in tumor therapy, causing poor response to treatment. Triaryl methyl (TAM) derivative radicals are commonly used in electron paramagnetic resonance (EPR) as sensors for quantitative spatial tissue oxygen mapping. They are also known as magnetic resonance imaging (MRI) contrast agents and fluorescence imaging compounds. We report the properties of the TAM radical tris(2,3,5,6-tetrachloro-4-carboxy-phenyl)methyl, (PTMTC), a potential multimodal (EPR/fluorescence) marker. PTMTC was spectrally analyzed using EPR and characterized by estimation of its sensitivity to the oxygen in liquid environment suitable for intravenous injection (1 mM PBS, pH = 7.4). Further, fluorescent emission of the radical was measured using the same solvent and its quantum yield was estimated. An in vitro cytotoxicity examination was conducted in two cancer cell lines, HT-29 (colorectal adenocarcinoma) and FaDu (squamous cell carcinoma) and followed by uptake studies. The stability of the radical in different solutions (PBS pH = 7.4, cell media used for HT-29 and FaDu cells culturing and cytotoxicity procedure, full rat blood and blood plasma) was determined. Finally, a primary toxicity test of PTMTC was carried out in mice. Results of spectral studies confirmed the multimodal properties of PTMTC. PTMTC was demonstrated to be not absorbed by cancer cells and did not interfere with luciferin-luciferase based assays. Also in vitro and in vivo tests showed that it was non-toxic and can be freely administrated till doses of 250 mg/kg BW via both i.v. and i.p. injections. This work illustrated that PTMTC is a perfect candidate for multimodal (EPR/fluorescence) contrast agent in preclinical studies.
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Affiliation(s)
- Agnieszka Boś-Liedke
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland. .,Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 14, 61614, Poznań, Poland.
| | - Magdalena Walawender
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland
| | - Anna Woźniak
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland
| | - Dorota Flak
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland
| | - Jacek Gapiński
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland.,Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 14, 61614, Poznań, Poland
| | - Stefan Jurga
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland.,Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 14, 61614, Poznań, Poland
| | - Małgorzata Kucińska
- Department of Toxicology, Poznan University of Medical Sciences, ul. Dojazd 30, 60631, Poznan, Poland
| | - Adam Plewiński
- Department of Toxicology, Poznan University of Medical Sciences, ul. Dojazd 30, 60631, Poznan, Poland
| | - Marek Murias
- Department of Toxicology, Poznan University of Medical Sciences, ul. Dojazd 30, 60631, Poznan, Poland
| | - Marwa Elewa
- Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Lisa Lampp
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Peter Imming
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Krzysztof Tadyszak
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61614, Poznań, Poland. .,Institute of Molecular Physics, Polish Academy of Sciences, ul. M. Smoluchowskiego 17, 60179, Poznań, Poland.
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Frank J, Elewa M, Said MM, El Shihawy HA, El-Sadek M, Müller D, Meister A, Hause G, Drescher S, Metz H, Imming P, Mäder K. Synthesis, Characterization, and Nanoencapsulation of Tetrathiatriarylmethyl and Tetrachlorotriarylmethyl (Trityl) Radical Derivatives—A Study To Advance Their Applicability as in Vivo EPR Oxygen Sensors. J Org Chem 2015; 80:6754-66. [PMID: 26020133 DOI: 10.1021/acs.joc.5b00918] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Tissue oxygenation plays an important role in the pathophysiology of various diseases and is often a marker of prognosis and therapeutic response. EPR (ESR) is a suitable noninvasive oximetry technique. However, to reliably deploy soluble EPR probes as oxygen sensors in complex biological systems, there is still a need to investigate and improve their specificity, sensitivity, and stability. We reproducibly synthesized various derivatives of tetrathiatriarylmethyl and tetrachlorotriarylmethyl (trityl) radicals. Hydrophilic radicals were investigated in aqueous solution mimicking physiological conditions by, e.g., variation of viscosity and ionic strength. Their specificity was satisfactory, but the oxygen sensitivity was low. To enhance the capability of trityl radicals as oxygen sensors, encapsulation into oily core nanocapsules was performed. Thus, different lipophilic triesters were prepared and characterized in oily solution employing oils typically used in drug formulations, i.e., middle-chain triglycerides and isopropyl myristate. Our screening identified the deuterated ethyl ester of D-TAM (radical 13) to be suitable. It had an extremely narrow single EPR line under anoxic conditions and excellent oxygen sensitivity. After encapsulation, it retained its oxygen responsiveness and was protected against reduction by ascorbic acid. These biocompatible and highly sensitive nanosensors offer great potential for future EPR oximetry applications in preclinical research.
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Affiliation(s)
- Juliane Frank
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Marwa Elewa
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.,‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Mohamed M Said
- ‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Hosam A El Shihawy
- ‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | | | - Diana Müller
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Annette Meister
- ⊥Center for Structure and Dynamics of Proteins (MZP), Biocenter Martin-Luther-Universität (MLU) Halle-Wittenberg, Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Gerd Hause
- #Biocenter Martin-Luther-Universität (MLU) Halle-Wittenberg, Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Simon Drescher
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Hendrik Metz
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Peter Imming
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Karsten Mäder
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
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5
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Novel supramolecular compounds based on tetrathiafulvalene tetracarboxylate with the cationic chains and anionic chains: Syntheses, charactarization and magnetic propertises. INORG CHEM COMMUN 2015. [DOI: 10.1016/j.inoche.2015.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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6
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Umanskii SY. Weak exchange interactions in biradicals: A pseudopotential for unpaired electrons and an asymptotic methods for calculating the exchange integral. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2015. [DOI: 10.1134/s1990793115010121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Vigier FM, Shimon D, Mugnaini V, Veciana J, Feintuch A, Pons M, Vega S, Goldfarb D. The 13C solid DNP mechanisms with perchlorotriphenylmethyl radicals – the role of 35,37Cl. Phys Chem Chem Phys 2014; 16:19218-28. [DOI: 10.1039/c4cp02275k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chlorinated trityl radicals generate 13C DNP frequency sweeps that indicate contributions of e → 36,37Cl → 13C polarization transfer mechanism at low temperatures and that the relative contributions of the solid effect and cross effects mechanism can be controlled by the microwave irradiation power.
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Affiliation(s)
- F. Mentink Vigier
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - D. Shimon
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - V. Mugnaini
- Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra, Spain
- Networking Research Center on Bioengineering
- Biomaterials
- and NanoMedicine (CIBER-BBN)
| | - J. Veciana
- Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra, Spain
- Networking Research Center on Bioengineering
- Biomaterials
- and NanoMedicine (CIBER-BBN)
| | - A. Feintuch
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - M. Pons
- Biomolecular NMR laboratory
- Department of Organic Chemistry
- University of Barcelona
- 10-12 08028 Barcelona, Spain
| | - S. Vega
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - D. Goldfarb
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
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8
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Yong GP, Li YZ, Zhang YM, She WL. Magnetic and luminescent properties of Cd(ii)- and Fe(ii)-anion radical frameworks: various networks or structures influenced by metal ion sizes or in situ forming mechanisms of anion radical ligand. CrystEngComm 2012. [DOI: 10.1039/c1ce05641g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Ratera I, Veciana J. Playing with organic radicals as building blocks for functional molecular materials. Chem Soc Rev 2012; 41:303-49. [DOI: 10.1039/c1cs15165g] [Citation(s) in RCA: 600] [Impact Index Per Article: 50.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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10
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Yong GP, Zhang YM, Zhang B. Hydrothermal syntheses, crystal structures and properties of novel quinone biradical and mixed-valence copper coordination polymer with semiquinone radical ligand generated in situ. CrystEngComm 2012. [DOI: 10.1039/c2ce26418h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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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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12
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Yong G, Li Y, She W, Zhang Y. Isostructural Metal-Anion Radical Coordination Polymers with Tunable Phosphorescent Colors (Deep Blue, Blue, Yellow, and White) Induced by Terminal Anions and Metal Cations. Chemistry 2011; 17:12495-501. [DOI: 10.1002/chem.201101621] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/25/2011] [Indexed: 11/06/2022]
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13
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Banerjee D, Paniagua JC, Mugnaini V, Veciana J, Feintuch A, Pons M, Goldfarb D. Correlation of the EPR properties of perchlorotriphenylmethyl radicals and their efficiency as DNP polarizers. Phys Chem Chem Phys 2011; 13:18626-37. [PMID: 21946909 DOI: 10.1039/c1cp21970g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water soluble perchlorinated trityl (PTM) radicals were found to be effective 95 GHz DNP (dynamic nuclear polarization) polarizers in ex situ (dissolution) (13)C DNP (Gabellieri et al., Angew Chem., Int. Ed. 2010, 49, 3360). The degree of the nuclear polarization obtained was reported to be dependent on the position of the chlorine substituents on the trityl skeleton. In addition, on the basis of the DNP frequency sweeps it was suggested that the (13)C NMR signal enhancement is mediated by the Cl nuclei. To understand the DNP mechanism of the PTM radicals we have explored the 95 GHz EPR characteristics of these radicals that are relevant to their performance as DNP polarizers. The EPR spectra of the radicals revealed axially symmetric g-tensors. A comparison of the spectra with the (13)C DNP frequency sweeps showed that although the solid effect mechanism is operational the DNP frequency sweeps reveal some extra width suggesting that contributions from EPR forbidden transitions involving (35,37)Cl nuclear flips are likely. This was substantiated experimentally by ELDOR (electron-electron double resonance) detected NMR measurements, which map the EPR forbidden transitions, and ELDOR experiments that follow the depolarization of the electron spin upon irradiation of the forbidden EPR transitions. DFT (density functional theory) calculations helped to assign the observed transitions and provided the relevant spin Hamiltonian parameters. These results show that the (35,37)Cl hyperfine and nuclear quadrupolar interactions cause a considerable nuclear state mixing at 95 GHz thus facilitating the polarization of the Cl nuclei upon microwave irradiation. Overlap of Cl nuclear frequencies and the (13)C Larmor frequency further facilitates the polarization of the (13)C nuclei by spin diffusion. Calculation of the (13)C DNP frequency sweep based on the Cl nuclear polarization showed that it does lead to an increase in the width of the spectra, improving the agreement with the experimental sweeps, thus supporting the existence of a new heteronuclear assisted DNP mechanism.
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Affiliation(s)
- Debamalya Banerjee
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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Berghof C, Grosu IG, Lönnecke P, Gómez-Ruiz S, Silaghi-Dumitrescu L, Hey-Hawkins E. Coordination chemistry of the heterotopic 1,2-phenylenebis(thio)diacetic acid ligand: Rhodium(I), palladium(II) and nickel(II) complexes. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Datcu A, Roques N, Jubera V, Imaz I, Maspoch D, Sutter J, Rovira C, Veciana J. Three‐Dimensional Open‐Frameworks Based on LnIIIIons and Open‐/Closed‐Shell PTM Ligands: Synthesis, Structure, Luminescence, and Magnetic Properties. Chemistry 2011; 17:3644-56. [DOI: 10.1002/chem.201002993] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2010] [Indexed: 11/11/2022]
Affiliation(s)
- Angela Datcu
- Departament de Nanociència Molecular i Materials Orgànics, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra (Spain), Fax: (+34) 935805729
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER‐BBN) ICMAB‐CSIC, 08193 Bellaterra (Spain)
| | - Nans Roques
- Departament de Nanociència Molecular i Materials Orgànics, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra (Spain), Fax: (+34) 935805729
- CNRS; LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, 31077 Toulouse (France), Fax: (+33) 561553003
- Université de Toulouse; UPS, INPT, LCC, 31077 Toulouse (France)
| | - Véronique Jubera
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac (France)
| | - Inhar Imaz
- Centre d'Investigació en Nanociència i Nanotecnologia (ICN‐CSIC) Campus UAB, 08193 Bellaterra (Spain)
| | - Daniel Maspoch
- Centre d'Investigació en Nanociència i Nanotecnologia (ICN‐CSIC) Campus UAB, 08193 Bellaterra (Spain)
| | - Jean‐Pascal Sutter
- CNRS; LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, 31077 Toulouse (France), Fax: (+33) 561553003
- Université de Toulouse; UPS, INPT, LCC, 31077 Toulouse (France)
| | - Concepció Rovira
- Departament de Nanociència Molecular i Materials Orgànics, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra (Spain), Fax: (+34) 935805729
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER‐BBN) ICMAB‐CSIC, 08193 Bellaterra (Spain)
| | - Jaume Veciana
- Departament de Nanociència Molecular i Materials Orgànics, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra (Spain), Fax: (+34) 935805729
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER‐BBN) ICMAB‐CSIC, 08193 Bellaterra (Spain)
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Yong GP, Li YZ, Li CF, Zhang YM, She WL. New metal-anion radical framework materials: CoII compounds showing ferromagnetic to antiferromagnetic phase transition at about 344 K, and ZnII compounds exhibiting terminal anion ligand induced direct white-light-emission. Dalton Trans 2011; 40:4131-9. [DOI: 10.1039/c0dt01667e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Dane EL, Swager TM. Synthesis of a water-soluble 1,3-bis(diphenylene)-2-phenylallyl radical. J Org Chem 2010; 75:3533-6. [PMID: 20420445 DOI: 10.1021/jo100577g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The design and synthesis of a water-soluble 1,3-bis(diphenylene)-2-phenylallyl (BDPA) radical via the conjugate addition of a derivatized fluorene nucelophile is described. The compound is designed for use in dynamic nuclear polarization NMR. Its 9 GHz EPR spectrum in glycerol/water is reported.
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Affiliation(s)
- Eric L Dane
- Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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18
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Paniagua JC, Mugnaini V, Gabellieri C, Feliz M, Roques N, Veciana J, Pons M. Polychlorinated trityl radicals for dynamic nuclear polarization: the role of chlorine nuclei. Phys Chem Chem Phys 2010; 12:5824-9. [PMID: 20454741 DOI: 10.1039/c003291n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polychlorinated trityl radicals bearing carboxylate substituents are water soluble persistent radicals that can be used for dynamic nuclear polarization. In contrast to other trityl radicals, the polarization mechanism differs from the classical solid effect. DFT calculations performed to rationalize this behaviour support the hypothesis that polarization is transferred from the unpaired electron to chlorine nuclei and from these to carbon by spin diffusion. The marked differences observed between neutral and anionic forms of the radical will be discussed.
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Gabellieri C, Mugnaini V, Paniagua J, Roques N, Oliveros M, Feliz M, Veciana J, Pons M. Dynamic Nuclear Polarization with Polychlorotriphenylmethyl Radicals: Supramolecular Polarization-Transfer Effects. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Gabellieri C, Mugnaini V, Paniagua J, Roques N, Oliveros M, Feliz M, Veciana J, Pons M. Dynamic Nuclear Polarization with Polychlorotriphenylmethyl Radicals: Supramolecular Polarization-Transfer Effects. Angew Chem Int Ed Engl 2010; 49:3360-2. [DOI: 10.1002/anie.201000031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tu T, Maris T, Wuest JD. Synthesis and Structure of Spirocyclic Tetraethers Derived from [1,1′-Binaphthalene]-2,2′-diol and Pentaerythritol. J Org Chem 2008; 73:5255-63. [DOI: 10.1021/jo800215w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tao Tu
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - Thierry Maris
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - James D. Wuest
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
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Roques N, Maspoch D, Luis F, Camón A, Wurst K, Datcu A, Rovira C, Ruiz-Molina D, Veciana J. A hexacarboxylic open-shell building block: synthesis, structure and magnetism of a three-dimensional metal–radical framework. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b713705b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Maspoch D, Domingo N, Roques N, Wurst K, Tejada J, Rovira C, Ruiz-Molina D, Veciana J. Structural and magnetic modulation of a purely organic open framework by selective guest inclusion. Chemistry 2007; 13:8153-63. [PMID: 17639542 DOI: 10.1002/chem.200700353] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Solvent inclusion/evacuation caused variations in the structural and magnetic characteristics of the purely organic porous magnet based on the tricarboxylic-substituted PTMTC radical. Whereas no inclusion is observed for nonpolar solvents, the exposure of crystals of the alpha-phase of PTMTC to vapors of polar organic solvents with hydrogen acceptor and/or donor functionalities, such as, ethanol, benzoic alcohol, n-decanol, THF, and DMSO results in the inclusion of these solvents in the highly polar tubular channels of the alpha-phase. The resulting inclusion compounds of formula PTMTC.x(guest) show several structural rearrangements, as confirmed by IR and XRPD (X-ray powder diffraction) measurements. The crystal transformations have been studied for a specific case: the PTMTC.EtOH adduct. The crystal structure reveals that included guest solvent molecules participate in the formation of new hydrogen bonds with the carboxylic groups of PTMTC radicals, inducing the disruption of several direct hydrogen bonds among these radicals. As expected, the interruption of direct hydrogen bonds between PTMTC radicals induces large transformations in the magnetic properties. From the ferromagnetic behavior of the alpha-phase, predominant antiferromagnetic interactions are observed for the inclusion adducts. Interestingly, both structural and magnetic changes are reversible after removal of guest solvent molecules.
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Affiliation(s)
- Daniel Maspoch
- Institut de Ciència de Materials de Barcelona, CSIC, Campus Universitari de Bellaterra, 08193, Bellaterra, Spain.
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Roques N, Perruchas S, Maspoch D, Datcu A, Wurst K, Sutter JP, Rovira C, Veciana J. Europium (III) complexes derived from carboxylic-substituted polychlorotriphenylmethyl radicals. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gagnon E, Maris T, Maly KE, Wuest JD. The potential of intermolecular N⋯O interactions of nitro groups in crystal engineering, as revealed by structures of hexakis(4-nitrophenyl)benzene. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.03.101] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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