2012 Fiscal Year Final Research Report
A Precursor for Chiral Separation during Crystallization
| Project/Area Number |
23656005
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2012
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| Keywords | キラル / 結晶成長 / その場観察 / 準安定 / 核形成 |
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| Research Abstract |
To understand the chiral symmetry breaking during crystallization of NaClO3, we directly observed the initial stage of crystallization from an aqueous solution by usingpolarized-light microscopy. Crystallization of an achiral metastable phase and its transformation into a chiral cubic phase were observed in situ for the first time. The crystal structure of the achiral metastable phase was analyzed by cryogenic single-crystal X-ray structural analysis. The achiral metastable phase was monoclinic with a = 8.42, b = 5.26, c = 6.70 A, and = 109.71o, space group P21/a. As they grew larger, the achiral monoclinic crystals transformed into chiral cubic crystals, showing that the achiral phase acts as aprecursor of the chiral phase.
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