- Photoinduced heterodisulfide metathesis for reagent-free synthesis of polymer nanoparticles
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Reagent-free synthetic methods are of great interest because of their simplicity and implications in green chemistry. We have taken advantage of photoinduced heterodisulfide metathesis to generate crosslinked polymer nanoparticles. The method of development and the mechanistic basis for the synthetic approach are outlined in this communication.
- Li, Longyu,Song, Cunfeng,Jennings, Matthew,Thayumanavan
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p. 1425 - 1428
(2015/08/03)
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- Pyridine-2-sulfonates as Versatile Ligands for the Synthesis of Novel Coordinative and Hydrogen-Bonded Supramolecules
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The reactions of 3-methylpyridine-2-sulfonic acid (3-mpSO3H) with CuII and 4-methylpyridine-2-sulfonic acid (4-mpSO3H) with ZnII in water formed one-dimensional infinite coordination polymers, [Cu(3-mpSO3)2]n (1) and [Zn(4-mpSO3)2]n (2). Similarly, two-dimensional hydrogen-bonded supramolecules of stoichiometries, [ML 2(H2O)2] [L = 3-methylpyridine-2-sulfonate (3-mpSO3), M = Mn (3), Fe (4), Co (5), Zn (6); L = 5-methylpyridine-2-sulfonate (5-mpSO3), M = Zn (7); L = pyridine-2-sulfonate (PySO3), M = Zn (8); L = 4-mpSO3, M = Co (9)], [Ni(3-mpSO3)2(H2O) 2]·H2O (10) and the one-dimensional hydrogen-bonded network [VO(acac)(3-mpSO3)(H2O)] (11) (acac = acetylacetonate) have been prepared. The ligands are tridentate [N,O-chelating-Cu-μ-O-bridging] in 1 and 2, while in all the other compounds the N,O-chelating and uncoordinated O atoms are engaged in intermolecular hydrogen bonding leading to the formation of hydrogen-bonded networks. The geometry around each metal center is octahedral (9) or distorted octahedral (1-8, 10 and 11). The compounds 3-8, and 10 showed novel π-π stacking interactions, not shown by 9 and 11. The magnetic behavior of 3 and 11 indicates lack of any intermolecular magnetic interactions. The position of the substituents in the pyridyl ring and Jahn-Teller effect (CuII) appear to determine the stacking interactions as well as the density of ligands with regard to the formation of coordinative and hydrogen-bonded supramolecules. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
- Lobana, Tarlok S.,Kinoshita, Isamu,Kimura, Kentaro,Nishioka, Takanori,Shiomi, Daisuke,Isobe, Kiyoshi
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p. 356 - 367
(2007/10/03)
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- Gas-phase pyrolytic reactions of esters of 2-pyridine and 8-quinoline sulfonic acid
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The rates of gas-phase thermal elimination reaction of esters of 2-pyridine sulfonic acid and 8-quinoline sulfonic acid have been measured over at least 50° for each compound. The relative rates of the first-order unimolecular decomposition at 500 K for the primary:secondary esters suggest that C-O bond breaking is kinetically more significant than C-H bond breaking, leading to a transition state of carbocationic character. This is consistent with the electron-donating effect provided by the methoxy substituent in 2-p-methoxyphenylethyl of 2-pyridine and 8-quinoline sulfonate esters stabilizing the carbocation center.
- Al-Awadi, Nouria A.,Kaul, Kamini,Dib, Hicham H.
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p. 771 - 775
(2007/10/03)
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