14384-45-3Relevant articles and documents
Tris-pyridylmethylamine (TPMA) complexes functionalized with persistent nitronyl nitroxide organic radicals
Badetti, Elena,Licini, Giulia,Lloveras, Vega,Scaramuzzo, Francesca Anna,Veciana, Jaume,Vidal-Gancedo, José,Wurst, Klaus,Zonta, Cristiano
, p. 10011 - 10016 (2020)
The chance to have persistent organic radicals in combination with metals has attracted much interest since it offers the possibility of having new functional molecules with multiple open-shell elements. In this study, we report the synthesis of two tripodal tris(2-pyridyl)methylamine ligands (TPMA) functionalized with nitronyl nitroxide persistent radicals. The newly formed ligands have been used to coordinate zinc(ii), copper(ii), iron(ii) and cobalt(ii). The resulting complexes have been investigated by means of electron paramagnetic resonance (EPR), ESI-MS, FT-IR spectroscopy and X-ray diffraction. An electron reduction of the N-O radical moiety has been observed, depending on the metal used for the formation of the complex and the reaction conditions. We have observed small differences in the EPR spectra depending on the meta or para position of the radical moiety in the complex structure and some antiferromagnetic interactions between the paramagnetic M(ii) ions and the radical species. This journal is
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Lamchen,M.,Mittag,T.W.
, p. 2300 - 2303 (1966)
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High-Spin Organic Diradical with Robust Stability
Gallagher, Nolan M.,Bauer, Jackson J.,Pink, Maren,Rajca, Suchada,Rajca, Andrzej
, p. 9377 - 9380 (2016)
Triplet ground-state organic molecules are interesting with respect to several emerging technologies but typically exhibit limited stability. We report two organic diradicals, one of which possesses a triplet ground state (2J/kB = 234 ± 36 K) and robust stability at elevated temperatures. We are able to sublime this high-spin diradical under high vacuum at 140 °C with no significant decomposition.
Alkali metal ion triggered conductive and stimuli-responsive metallogels
Chen, Shaorui,Li, Xiaoyuan,Yu, Xudong
, (2021)
A novel gelator NDH containing naphthalimide substituted with a 4,4,5,5-tetramethylimidazoline-1,3-diol group was synthesized and characterized. Driven by dynamic coordination interactions between the imidazoline-1,3-diol unit and alkali, NDH self-assembled into a wide range of metallogels in pentanol triggered by sonication just at room temperature. The coordination interactions between NDH and Li+ were further certified by 1H NMR and XRD analysis. The gels were characterized by several experiments such as UV–vis, fluorescent, SEM and rheology experiments. Notably, the ion conductivity of Li+/metallogels confirmed that the three dimensional network in the organogels does not affect the ions diffusion in the large interconnected liquid domains. Electrochemical impedance spectroscopy was used to prove that NDH/LiClO4-gel had stronger electrical conductivity than that of NDH/LiCl-gel.
Synthesis, crystal structure, magnetic, spectroscopic, and theoretical investigations of two new nitronyl-nitroxide complexes
Spinu, Cristian Andrei,Pichon, Céline,Ionita, Gabriela,Mocanu, Teodora,Calancea, Sergiu,Raduca, Mihai,Sutter, Jean-Pascal,Hillebrand, Mihaela,Andruh, Marius
, p. 279 - 293 (2021)
Two mononuclear complexes [(Et3NH)[M(hfac)2L] (M = Ni, 1; Zn, 2) have been synthesized using a nitronyl-nitroxide radical substituted nitrophenol, that is 2-(2-hydroxy-3-methoxy-5-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl, HL, as a proligand. The crystal structures of 1 and 2 have been solved and indicate an octahedral coordination geometry of the metal ions. The magnetic behavior for 1 is characterized by a strong antiferromagnetic metal–radical interaction (J = ?351 ± 1 cm?1; H = ?JS Ni S Rad). This exchange interaction was rationalized by DFT calculations. The EPR spectra recorded in both solution and solid state at 120 K confirm the S = ? ground state for 1.
Synthesis and Straightforward Quantification Methods of Imino Nitroxide-Based Hexaradical Architecture on a Cyclotriphosphazene Scaffold
Fidan, Ismail,?nal, Emel,Yerli, Yusuf,Luneau, Dominique,Ahsen, Vefa,Hirel, Catherine
, p. 11447 - 11453 (2016)
The synthesis of a homogeneous neutral hexaradical architecture consisting of six imino nitroxide radical moieties covalently bonded on a cyclotriphosphazene scaffold was reported. The synthesis of hexaradical imino nitroxide compounds follows the Ullman procedure involving the condensation of 2,3-bis(hydroxylamino)-2,3-dimethylbutane with hexa-(4-formylphenoxy)cyclotriphosphazene (3) followed by oxidation of the condensation product hexa-[4-(1-hydroxy-4,4,5,5-tetramethyl-2-imidazoline-2-yl)phenoxy]cyclotriphosphazene (2) by NaIO4. Characterization of hexaradical was performed by X-ray and SQUID in solid state and by EPR, absorption spectroscopy, and electrochemistry in solution. CV of 1 shows an oxidation peak at 1.184 V (vs SCE) and a reduction peak at -0.883 V, both characteristics of the presence of phenyl imino nitroxide (7) moieties, suggesting that the contribution of the cyclotriphosphazene core is negligible. Attention was particularly focused on developing methods, UV-vis spectroscopy and square-wave voltammetry, to quantify the number of radicals in a way to confirm easily and rapidly the polyradicals' structure.
Magnetic complex and preparation method thereof
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Paragraph 0024-0029, (2021/01/11)
The molecular formula of the magnetic complex disclosed by the invention is C45H42F18N6O10Sm; the structural formula of the magnetic complex is shown as a formula I. The magnetic complex is prepared by the following method: 1, preparing 2, 3-dimethyl-2, 3-dihydroxyaminobutane; 2, preparing an organic nitroxide free radical precursor; 3, preparing organic nitroxide free radicals; and 4, preparing the magnetic complex. The preparation method of the magnetic complex is simple and easy to operate, quick in reaction, short in synthesis time, high in yield, high in reproducibility, environmentally friendly, low in raw material cost and sufficient in source. At a low temperature, the material has an obvious variable magnetic behavior, and can be used as a magnetic sensing material and a high-density information storage material.