<sup>1</sup>H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响

引用本文: 叶斌, 高才, 赵韩, 陈开松, 杨锁, 刘向农. ¹H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响[J]. 物理化学学报, 2011, 27(11): 2505-2511. doi: 10.3866/PKU.WHXB20111103 shu

Citation: YE Bin, GAO Cai, ZHAO Han, CHEN Kai-Song, YANG Suo, LIU Xiang-Nong. ¹H NMR Investigation on Effect of Solute Concentration on the Hydrogen Bonding and Glass Transition of Three-Carbon Polyalcohol Aqueous Solutions[J]. Acta Physico-Chimica Sinica, 2011, 27(11): 2505-2511. doi: 10.3866/PKU.WHXB20111103 shu

¹H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响

基金项目:
国家自然科学基金(20803016) (20803016)

安徽省自然科学基金(070414163)资助项目 (070414163)

摘要: 为考察溶质浓度对三碳多元醇水溶液氢键作用以及不同物质玻璃态形成能力的影响, 采用¹H NMR 外标法研究不同浓度的1-丙醇(NPA), 2-丙醇(IPA), 1,2-丙二醇(PG), 1,3-丙二醇(PD)和丙三醇(glycerol)的水溶液在室温常压下质子化学位移. 结果表明: 具有CH₃CH(OH)―基团的PG烷基质子的化学位移变化趋势与其他几种醇相比有较大差异. 醇羟基质子与水分子的氧形成较强O―H···O氢键. 相同摩尔分数下, 羟基数的增加导致水质子和羟基质子的化学位移降低, 而且羟基位置不同也会导致水质子和羟基质子化学位移差异. 这几种三碳多元醇碱性强弱的顺序和降低冰的均相成核温度能力的顺序一致, 即glycerol>PG>PD>IPA>NPA, ¹H NMR技术表明glycerol 和PG更适合用作低温保护剂.

关键词:

English

¹H NMR Investigation on Effect of Solute Concentration on the Hydrogen Bonding and Glass Transition of Three-Carbon Polyalcohol Aqueous Solutions

1.
School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, P. R. China
Received Date: 02 June 2011
Available Online: 27 October 2011
Fund Project:
国家自然科学基金(20803016)

安徽省自然科学基金(070414163)资助项目

Abstract: We investigated the effects of solute concentration on the hydrogen bonding interactions of three-carbon polyalcohol aqueous solutions. In order to inspect the capacity of the solutions to form glass, proton nuclear magnetic resonance (¹H NMR) chemical shifts were determined in binary mixtures of water and 1-propanol (NPA), 2-propanol (IPA), 1,2-propanediol (PG), 1,3-propanediol (PD), and glycerol at room temperature and at atmospheric pressure using the external reference method. We found that the alkyl proton chemical shifts of PG with the CH₃CH(OH)― group showed biphasic behavior, which was different from other molecules. Water molecules formed relatively strong O ― H···O hydrogen bonds with the alcohol hydroxyls. The proton chemical shifts of H₂O and the hydroxyl protons decrease with an increase in the number of alcohol hydroxyls at the same mole fraction. Moreover, the proton chemical shifts of H₂O and hydroxyl protons with the same number of alcohol hydroxyls are different because of their different locations. The order of increased basicity agrees with the order of increased ice homogeneous nucleation suppression, that is, glycerol>PG>PD>IPA>NPA. This explains why glycerol and PG are more suitable as cryoprotective agents (CPAs) among the five polyalcohols.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

¹H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响

English

¹H NMR Investigation on Effect of Solute Concentration on the Hydrogen Bonding and Glass Transition of Three-Carbon Polyalcohol Aqueous Solutions

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

1H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响

English

1H NMR Investigation on Effect of Solute Concentration on the Hydrogen Bonding and Glass Transition of Three-Carbon Polyalcohol Aqueous Solutions

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

¹H NMR研究溶质浓度对三碳多元醇水溶液氢键作用以及玻璃化的影响

¹H NMR Investigation on Effect of Solute Concentration on the Hydrogen Bonding and Glass Transition of Three-Carbon Polyalcohol Aqueous Solutions

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs