| Project/Area Number |
04504002
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
有機化学一般
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
IWASAKI Fujiko The Uiversity of Electro-Communications Dept. of Applied Phys. and Chem. Prof., 電気通信学部, 教授 (10017329)
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| Co-Investigator(Kenkyū-buntansha) |
KATAYAMA Chuji Mac Science Co. Ltd. Res. and Dev. Division Director, 技術開発本部, 本部長
YASUI Masanori The Uiversity of Electro-Communications Dept.of Applied Phys. and Chem. Research, 電気通信学部, 助手 (00201822)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥43,900,000 (Direct Cost: ¥43,900,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1992: ¥38,600,000 (Direct Cost: ¥38,600,000)
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| Keywords | Crystal Structure Analysis / New Diffractometer / Imaging Plate / Unstable Crystals / Phase Transformation / High Temperature X-ray Diffraction |
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| Research Abstract |
1. Rapid collection of X-ray intensity data is especially important for determining structures of unstable crystal. A new type of X-ray diffractometer (DIP-3000) has been developed with Imaging plate as a two-dimensional detector, a kappa-goniometer and a mu-axis in order to measure diffraction intensities from a single crystal within several hours.
2. A performance test and comparison of structures using a four-circle diffractometer indicated that the accuracy of the intensity data taken with our new rapid X-ray measurement system are reliable and the system can work quite satisfactorily as a tool of ordinary crystallography and very useful for unstable crystals. Total time for data collection was about 2 or 3 hours for reach crystals, on the contrast to about 3 or 4 days on the four-circle diffractometer. Although R values are larger by about 0.01 than those of four-circle diffractometer, bond lengths and angles obtained from this equipment and a four-circle diffractometer agree quite well within the estimated standard deviations.
3. Using this equipment we could successfully determined the crystal structures of several new metal-carbene complexes whose crystals were very unstable. It is revealed that this equipment is very useful for crystals having a large unit cell. Intensity data could be measured within 7-10 hours, on the contrast to about 10 or 14 days on the four-circle diffractometer.
4. Dynamic structural transformations and molecular motion in organic crystals were also investigated using this equipment and the mechanism of thermal rearrangement in 2,4-dinitrophenyl-o-anisidine was revealed.
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