| Project/Area Number |
22550013
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Okayama University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
GOTOH Kazuma 岡山大学, 自然科学研究科, 助教 (20385975)
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| Co-Investigator(Renkei-kenkyūsha) |
ASAJI Tetsuo 日本大学, 文理学部, 教授 (40133128)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 結晶構造 / 分子構造 / 水素結合 / 単結晶X線構造解析 / 核四極共鳴 / 単結晶Ｘ線構造解析 / 相転移 |
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| Research Abstract |
In order to investigate a static and dynamic structure of strong hydrogen-bonded system, nitrogen and chlorine nuclear quadrupole resonance (NQR) frequencies and the spin-lattice relaxation times as well as single crystal X-ray diffraction have been measured in a wide temperature range for organic salts and co-crystals in which the components are connected by short hydrogen bonds. The systems undertaken are chloranilic acid-pyridine (or amine) derivatives, chloro-nitro-benzoic acid-pyridine (or amine) derivatives, which are expect to have a short hydrogen bond with a disordered hydrogen atom in it. The results are as follows: (1) disordered feature of the H atom in a one-dimensional hydrogen-boned system of chloranilic acid-morpholine (1/1) system was clarified and an anomalous temperature dependence of the NQR frequencies was analyzed by the H atom disorder; (2) hydrogen-bonding schemes in (1/1) and (1/2) compounds of chloranilic acid with pyrrolidone and piperidone were determined; (3) mechanism of the antiferroelectric-paraelectric phase transition in (1/1) compounds of chloranilic acid with 5,5'-dimethyl-2,2'-bipyridine and 1,5-naphthyridine was analyzed by temperature dependence of nitrogen NQR frequencies; (4) mechanism of the phase transition and disordering in hydrogen-bonded system of pyrimidinium hydrogen chloranilate monohydrate were clarified; (5) new hydrogen-bonded systems of chloro-nitro-benzoic acids with quinoline and phthalazine, where a short hydrogen bond exists between the acid and base molecules, were found.
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