^<17>O-^1H Double resonance study of the mechanism of thermochromism
^<17>O-^1H 热致变色机理的双共振研究
基本信息
- 批准号:04453015
- 负责人:
- 金额:$ 4.61万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1992
- 资助国家:日本
- 起止时间:1992 至 1993
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Thermochromism has recently been attracted much interest with respect to its molecular mechanisms. In order to investigate the molecular basis of the thermochromism by means of nuclear quadrupole resonance of the oxygen-17 nucleus in thermochromic materials we designed and constructed a ^<17>O-^1H nuclear double resonance spectrometer on the basis of Slusher-Hahn double resonance principle. It observes the existence and the degree of polarization transfer from rare spin systems such as ^<17>O and ^<14>N to proton at zero magnetic field.The apparatus consists of Oxford superconducting magnet (the field is 4.7 T, ^1H resonance at 200Mhz), Bruker MSL-200NMR system which observe the proton nuclear magnetic resonance spectrum, a sample shooting system into zero-fields pace in a few seconds, and the small solenoid magnet for eliminating the residual magnetic field of an amount of about 10 mT.The latter two systems were constructed and tested the last year. An L-C matching unit to supply the … More radio-frequency magnetic field for the low-frequency nuclear quadrupole resonance was constructed.The double resonance experiments search the reduction of the proton resonace signal due to the polrization-transfer from the rare spin system to the proton spins by sweeping the low-frequency quadrupole resonance frequency ; whole experimental procedures were automated by the use of a personal computer system the program for which was coded by the BASIC and the assembler languages. The data analysis were performed by means of a work station.The double resonance system described above was used to observe successfully the pure nuclear quadrupole resonance signals of ^<14>N in crystalline acetamide ; however, we could neither observe any significant signals of ^<17>O nor ^<14>N in N-salicylideneaniline which is typical thermochromic material. The failure may be attributed to significantly large scattering of data due to very poor proton signal and to rapid self-reduction of the proton signal caused by efficient relaxation rate, which concealed the effective reduction of the proton signal by the polarization transfer. Less
热致变色现象最近因其分子机制引起了人们的广泛兴趣。为了通过热致变色材料中氧17核的核四极共振来研究热致变色的分子基础,我们根据Slusher-Hahn双共振原理设计并构建了^<17>O-^1H核双共振光谱仪。观测零磁场下^<17>O、^<14>N等稀有自旋体系向质子的极化转移的存在及程度。装置由牛津超导磁体(场强4.7T,^1H共振频率200Mhz)、观察质子核磁共振谱的Bruker MSL-200NMR系统、快速进入零场的样品发射系统组成。 秒,以及用于消除约10 mT的剩余磁场的小螺线管磁铁。后两个系统是去年建造和测试的。构建了为低频核四极共振提供射频磁场的L-C匹配单元。双共振实验通过扫描低频四极共振频率,寻找稀有自旋系统到质子自旋的极化转移导致的质子共振信号的减少;整个实验过程通过使用个人计算机系统实现自动化,该系统的程序由 BASIC 和汇编语言编码。利用工作站进行数据分析。利用上述双共振系统成功观察到结晶乙酰胺中^ 14 N的纯核四极共振信号;然而,在典型的热致变色材料N-水杨基苯胺中,我们既不能观察到任何显着的^ 17 O信号,也不能观察到^ 14 N信号。失败可能是由于质子信号非常差而导致数据显着分散,以及有效弛豫率引起的质子信号快速自还原,这掩盖了偏振转移对质子信号的有效还原。较少的
项目成果
期刊论文数量(36)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hiroshi Kataoka: "Scandium-45 nuclear magnetic resonance and phase transtions in scandium acetates,Sc(CH_3COO)_3 and Sc(CD_3COO)_3" J.Phys.Soc.Jpn.62. 1478-1481 (1993)
Hiroshi Kataoka:“Scandium-45 核磁共振和醋酸钪 Sc(CH_3COO)_3 和 Sc(CD_3COO)_3 中的相变”J.Phys.Soc.Jpn.62。
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Nobuo Nakamura: "Nuclear quadrupole interaction and ionic dynamics in sodium superionic conductors." Z.Naturforsch.47a (in press). (1994)
Nobuo Nakamura:“钠超离子导体中的核四极相互作用和离子动力学。”
- DOI:
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Hiroshi Kataoka: "Scandium-45 nuclear magnetic resonance and phase transitions in scandium acetates, Sc(CH_3COO)_3 and Sc(CD_3COO)_3." J.Phys Soc. Jpn.62 (5). 1478-1481 (1993)
Hiroshi Kataoka:“Scandium-45 核磁共振和醋酸钪 Sc(CH_3COO)_3 和 Sc(CD_3COO)_3 中的相变。”
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- 影响因子:0
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Hirokazu Nakayama: "Phase transitions in 4,4'-dichlorobenzophenone as studied by ^<35>Cl FT-NQR." Z.Naturforsch.49a (in press). (1994)
Hirokazu Nakayama:“通过 35 Cl FT-NQR 研究 4,4-二氯二苯甲酮中的相变。”
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- 影响因子:0
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Bunsou Nagasaka: "Residual dipolar splittings in ^<13>C CP/MAS NMR specra due to quadrupolar halogen nuclei in uracil halides." Chem. Phys. Let.(in press). (1994)
Bunsou Nagasaka:“由于尿嘧啶卤化物中的四极卤素原子核,在 13 C CP/MAS NMR 光谱中残留偶极分裂。”
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NAKAMURA Nobuo其他文献
NAKAMURA Nobuo的其他文献
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{{ truncateString('NAKAMURA Nobuo', 18)}}的其他基金
DISIGN AND CONSTRUCTION OF ORGANIC FERROMAGNET AND THEIR CRYSTAL DESIGN.
有机铁磁体及其晶体设计的设计和构造。
- 批准号:
06453037 - 财政年份:1994
- 资助金额:
$ 4.61万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
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- 批准号:
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