- Hybrid organic-inorganic connectivity of NdIII(pyrazine-: N, N ′-dioxide)[CoIII(CN)6]3- coordination chains for creating near-infrared emissive Nd(iii) showing field-induced slow magnetic relaxation
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A near-infrared emissive and magnetically anisotropic Nd(iii) complex is formed within a hybrid organic-inorganic {[NdIII(pzdo)(H2O)4][CoIII(CN)6]}·0.5(pzdo)·4H2O (1) (pzdo = pyrazine-N,N′-dioxide) ladder chain built of coexisting Nd-pzdo-Nd and Nd-NC-Co molecular bridges. 1 reveals two NdIII-centered properties, a field-induced slow magnetic relaxation of a single-ion origin with a thermal energy barrier of ΔE/kB = 51(2) K at Hdc = 1 kOe, and a near-infrared fluorescence sensitized by organic and inorganic linkers.
- Chorazy, Szymon,Charytanowicz, Tomasz,Wang, Junhao,Ohkoshi, Shin-Ichi,Sieklucka, Barbara
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supporting information
p. 7870 - 7874
(2018/06/29)
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- Synthesis of N,N-Dioxopyridazines
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Despite many efforts, one of the smallest heterocycles containing two nitrogen atoms, pyridazine, could not be converted to its N,N-dioxide (see, however, Nakadate et al. Chem. Pharm. Bull. 1970, 18, 1211-1218). HOF·CH3CN, made easily from diluted fluorine, was able to accomplish this task in a fast reaction with good yields.
- Rozen, Shlomo,Shaffer, Avshalom
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supporting information
p. 4707 - 4709
(2017/09/23)
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- Oxidation methods for aromatic diazines: Substituted pyrazine-N-oxides, pyrazine-N,N′-dioxides, and 2,2′:6′,2″-terpyridine-1,1″-dioxide
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In the course of investigations into the intermolecular interactions of azaaromatic N-oxides it was necessary to perform oxidations of the pyridine and pyrazine moieties. Generally, it was found that direct oxidation with OXONE gave efficient preparation of pyrazine dioxides. Oxidation with dimethyldioxirane was used to preclude problems associated with the isolation of particularly hydrophilic pyrazine and pyrazine-N-oxides.
- McKay, Scott E.,Sooter, Joseph A.,Bodige, Satish G.,Blackstock, Silas C.
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p. 307 - 312
(2007/10/03)
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- Thermochemical and Theoretical Study of Some Quinoxaline 1,4-Dioxides and of Pyrazine 1,4-Dioxide
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The following standard molar enthalpies of formation in the gaseous state at 298.15 K were determined from the enthalpies of combustion of the crystalline solids, and their enthalpies of sublimation and the mean (N-O) bond dissociation enthalpies were derived. ΔfHm0(g); 〈D(N-O)〉 (kJ mol-1): quinoxaline 1,4-dioxide, 227.1 ± 2.4; 255.8 ± 2.0; 2-methylquinoxaline 1,4-dioxide, 169.9 ± 7.2; 268.3 ± 4.9; 2-methyl-3-acetylquinoxaline 1,4-dioxide, 33.1 ± 5.0; 251.6 ± 4.2; 2-phenyl-3-benzoylquinoxaline 1,4-dioxide, 355.2 ± 7.1; 227.3 ± 5.4; 2-methyl-3-carbomethoxyquinoxaline 1,4-dioxide, -148.7 ± 3.2; 242.3 ± 3.9; pyrazine 1,4-dioxide, 186.5 ± 1.9; 254.0 ± 2.3; 2-methyl-5-pyrazinecarboxylic acid, -213.6 ± 1.7. Unconstrained geometry optimizations by ab initio calculations showed the effect of steric hindrance on changes in extended delocalizations and were in accord with the trends in the mean bond dissociation enthalpies.
- Acree Jr.,Powell, Joyce R.,Tucker, Sheryl A.,Ribeiro da Silva, Maria D.M.C.,Matos, M. Agostinha R.,Goncalves,Santos,Morais,Pilcher
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p. 3722 - 3726
(2007/10/03)
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