301 resultados para NMR dinamico DFT atropisomeri bifenili


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.Y(EGTA).Y(EGTA),(400MHz NMR

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Ln(TTHA)(Ln=La,YLu)NMR.NMRLu(TTHA)~1H,AB

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,.,,,,:

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(HDI),,HDIN100,TEO

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..(NMR).AA-BB,

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,(GSH).GSH.Eu~(3+)12.50.1L/mol100.00.5L/mol.~(13)CpHpK_a2.200.023.500.04.Dy~(3+)Ho~(3+)Er~(3+)Tm~(3+) Yb~(3+),GSH~(13)C,,.

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EVAc,EVBovey(),EVSung,EV13Sung,,~(13)C NMR13SungS_1,S_2,S_3,S_4,~+0ppm,EV~(13)C NMR,EV

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13C1HNMRLnNTA2LnCePrNdNTA.

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(NMR)(anisodamine)3,(DPPC),P-O,,C-2(DPPA),-,,DPPA(SPM),SPM3

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The microstructure of two bicomponent and one tricomponent segmented copolymers, based on polydimethylsiloxane, poly(p-hydroxystyrene) or/and polysulfone, were investigated using an extended Goldman-Shen pulse sequence, proton spin-spin relaxation measurements, and C-13 and Si-29 NMR spectra. The results indicate that there exist four phases with different sizes, components and morphological structure in the segmented copolymers studied in this work, i. e., a rigid-chain phase of very slow motion, a rigid-chain-rich phase of slow motion, a flexible-chain-rich phase of fast motion and a flexible-chain phase of faster motion. The sizes of different domains, calculated from the spin diffusion rates, are about 50-100 angstrom for the flexible-chain-rich phase of fast motion and 200-300 angstrom for the flexible-chain phase of faster motion. The relative quantities of polydimethylsiloxane in the flexible-chain phase of fast motion are slightly different in different kinds of segmented copolymers.