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• W2051736307 abstract "Dependence of the local structure and dynamic behavior of hydration water in (±)-[Co(en)3]Cl3·nD2O crystal (0 ≤ n ≤ 4) on the dehydration process was studied by means of 1H magic-angle sample spinning (MAS) NMR technique. The line shape in the 1H MAS NMR spectrum depends strongly on the water content (n). For n < 1.5, the spectrum consists mainly of two peaks whose relative intensities change with n, suggesting that the hydration water forms two different types of domainlike structures at room temperature. In addition, the full width at half-maximum of each component of the doublet was less than 1 ppm at room temperature, implying that the water moves rapidly enough to reduce the intermolecular 1H−1H dipole interaction. On cooling, the resonance line broadens and its line width exceeds 10 ppm below 200 K where the components of the doublets cannot be discerned. This aspect suggests that the water molecule undergoes slower motion than the MAS rate (5.0−7.0 kHz). The temperature dependence of the line width was analyzed by assuming the Davidson−Cole's spectral density. The activation energy (Ea) for the molecular motion of the water depends drastically on the water content: Ea assumes the constant value of 24 kJ mol-1 for n ≤ 2.1, but it decreases continuously for n > 2.1 and reaches 18 kJ mol-1 at n = 4. This finding suggests that the molecular motion of hydration water in the pore, which averages out the dipolar interaction between a trace amount of HDO and the protons on the pore wall, changes from whole molecular translational jump to proton migration through hydrogen bond accompanied by molecular reorientation." @default.
• W2051736307 created "2016-06-24" @default.
• W2051736307 creator A5061081732 @default.
• W2051736307 creator A5090733376 @default.
• W2051736307 date "2003-11-15" @default.
• W2051736307 modified "2023-09-27" @default.
• W2051736307 title "H MAS NMR Study of Local Structure and Dynamics of Water Molecule in (±)-[Co(en)₃]Cl₃·<i>n</i>D₂O" @default.
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• W2051736307 doi "https://doi.org/10.1021/jp027847x" @default.
• W2051736307 hasPublicationYear "2003" @default.
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