Probing intermolecular hydrogen bonding in sibenadet hydrochloride polymorphs by high-resolution (1) H double-quantum solid-state NMR spectroscopy.
Probing intermolecular hydrogen bonding in sibenadet hydrochloride polymorphs by high-resolution (1) H double-quantum solid-state NMR spectroscopy.
复制标题
通过高分辨率 (1) H 双量子固态 NMR 光谱探测盐酸西苯那得多晶型物中的分子间氢键。
DOI:
10.1002/jps.23078
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发表时间:
2012
影响因子:
3.8
通讯作者:
Bradley JP
中科院分区:
文献类型:
--
作者:
Bradley JP
Molecular packing in two polymorphs of sibenadet hydrochloride (AR-C68397AA, Viozan™) is investigated using a combined experimental1H double-quantum (DQ) solid-state magic-angle spinning nuclear magnetic resonance and computational (gauge including projected augmented wave calculation of chemical shifts) approach. For Form I, NH–NH and NH–OH1H DQ peaks are observed corresponding to nearest distances of 2.62 and 2.87 Å, respectively, for the intermolecular hydrogen-bonding arrangement in the single-crystal X-ray diffraction structure. The same1H DQ peaks at the same1H chemical shifts are observed for Form II, for which there is no single-crystal diffraction structure, indicating the same intermolecular hydrogen-bonding arrangement of the benzothiazolone moieties as in Form I.1H DQ build-up (as a function of the DQ recoupling time) curves are presented for the resolved NH–NH and NH–OH DQ peaks for the two polymorphs. For Form I, the ratio of the maximum intensity for the NH–OH and NH–NH DQ peaks is in excellent agreement with the ratio of the summed squares of the H–H dipolar couplings, as determined using H–H distances from the crystal structure up to 4 Å. Small differences in the1H DQ build-up behaviour for the two polymorphs are attributed to differences in the longer-range NH–OH distances associated with different inter-layer arrangements. © 2012 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 101:1821–1830, 2012
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DOI:
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发表时间:
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影响因子:
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