X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N<sup>+</sup>H…O<sup>-</sup>氢键电子库珀对的自旋流超导相变

引用本文: 王文清, 张玉凤, 龚. X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N⁺H…O^-氢键电子库珀对的自旋流超导相变[J]. 物理化学学报, 2014, 30(4): 608-622. doi: 10.3866/PKU.WHXB201402181 shu

Citation: WANG Wen-Qing, ZHANG Yu-Feng, NG Yan. Crystal Fine Structure and Optical Rotatory Angle Study on Spin Superfluidity of Intermolecular N⁺H…O^-Hydrogen Bond Electron Cooper Pairing onto D-, L-, and DL-Valine Optical Lattices[J]. Acta Physico-Chimica Sinica, 2014, 30(4): 608-622. doi: 10.3866/PKU.WHXB201402181 shu

X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N⁺H…O^-氢键电子库珀对的自旋流超导相变

基金项目:
国家自然科学基金（21002006, 20452002)

国家科技部基础研究重大项目（2004-973-36）资助

摘要:

为了解决D-和L-缬氨酸单晶在~270 K相变的机理和分岐，以比热法测定单晶、多晶粉末及Sigma多晶产品发现，只有D-和L-缬氨酸单晶发生相变，且为吸热反应，能差0.18 J·mol^-1. 本文以Mo-K_α (λ=0.071073nm)为光源的X衍射精确测定表明，D-/L-缬氨酸单晶属于单斜空间点群P2₁，Z=4. 在相变温度~270 K，其晶格常数分别为：a=0.96706(5)/0.96737(5) nm，b=0.52680(3)/0.52664(3) nm，c=1.20256(7)/1.20196(6) nm，β=90.724(2)°/90.722(3)°. 在晶体结构的单元细胞中，含有两种转动异构体：A (trans)和B (gauche Ⅰ). 温度为293、270、223、173 K的X衍射精细结构数据表明：在~270 K，D-缬氨酸单晶分子内N―H…O氢键中，N―H、H…O的键长及键角∠N―H…O都发生波动起伏而不可测，但N―H…O总键长变化稳定可测. 说明没有发生构型相变为L-缬氨酸. 根据D-和L-缬氨酸单晶中，NH₃→CO₂ 顺时针和逆时针的相反走向及D-，L-和DL-缬氨酸晶体旋光角的测定，在270-290 K可以观察到晶格分子间N+H…O^-氢键电子库珀对的自旋流超导相变.

关键词:

English

Crystal Fine Structure and Optical Rotatory Angle Study on Spin Superfluidity of Intermolecular N⁺H…O^-Hydrogen Bond Electron Cooper Pairing onto D-, L-, and DL-Valine Optical Lattices

1.
1 Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
2 School of Material Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. China
Received Date: 18 November 2013
Available Online: 31 March 2014
Fund Project:
国家自然科学基金（21002006, 20452002)

国家科技部基础研究重大项目（2004-973-36）资助

Abstract:

With a view to understanding the argument of the phase transition mechanisms of D- and Lvaline around 270 K, the temperature dependences of the heat capacities of single crystals, ground powders, and polycrystalline products were investigated using differential scanning calorimetry. Endothermic transition peaks were observed at phase transition temperatures of 273.59 and 273.76 K for D- and L-valine single crystals, respectively with an energy difference of 0.18 J?mol^-1. The X-ray crystal fine structure of chiral valine was determined using Mo-K_α radiation (λ=0.071073 nm) on Nonius Kappa CCD diffractometer. D- and L-valine crystals were monoclinic, with the P2₁ space group, Z=4, lattice constants a= 0.96706(5)/0.96737(5) nm, b=0.52680(3)/0.52664(3) nm, and c=1.20256(7)/1.20196 (6) nm, and β=90.724(2)°/90.722(3)° at ~270 K. Two crystallographically independent molecules A (trans form) and B (gauche I from) were observed in the unit cell, these were rotational isomers with two different conformations. X ray diffraction at 293, 270, 223, and 173 K showed that the N―H, H…O bond lengths and the N―H…O bond angle of D- valine fluctuated at 270 K，but the intramolecular N―H…O hydrogen bond was stable and measurable. No evidence was obtained for a configuration transformation from D-valine to L-valine. Based on the clockwise and counterclockwise rotations of NH₃→CO₂ in the chiral valine crystals and the optical rotatory angle measurements, the intermolecular N⁺H…O^- hydrogen bond was electronic Cooper pairing and exhibited the spin superfluidity onto D-, L-, and DL- valine crystal lattices from 270 to 290 K upon the transition to the superconducting state.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N⁺H…O^-氢键电子库珀对的自旋流超导相变

English

Crystal Fine Structure and Optical Rotatory Angle Study on Spin Superfluidity of Intermolecular N⁺H…O^-Hydrogen Bond Electron Cooper Pairing onto D-, L-, and DL-Valine Optical Lattices

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

X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N+H…O-氢键电子库珀对的自旋流超导相变

English

Crystal Fine Structure and Optical Rotatory Angle Study on Spin Superfluidity of Intermolecular N+H…O- Hydrogen Bond Electron Cooper Pairing onto D-, L-, and DL-Valine Optical Lattices

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

X衍射精细结构和晶体旋光角研究D-, L-, DL-缬氨酸晶格分子间N⁺H…O^-氢键电子库珀对的自旋流超导相变

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