In this study, we conducted successful experiments on ethylenediamine sulfate (EDS), an organic compound, to investigate its enantioselectivity in chiral crystallization. We employed optical trapping with circularly polarized laser beams, using a continuous wave laser at 1064 nm. By focusing the laser at the air–solution interface of a heavy water-saturated EDS solution, the formation of sub-micrometer-sized chiral EDS crystals was verified. Two generated enantiomorphs (d-crystal and l-crystal) were identified by the rotating analyzer method. The enantioselectivity in the chiral crystallization of EDS was assessed through 30 to 60 times experiments conducted under various conditions of laser powers and polarization modes, utilizing the count of generated crystals for each enantiomorph in the evaluation. Circularly polarized lasers at a specific power created an imbalance in the generation probability of the enantiomorphs, resulting in crystal enantiomeric excess values of 23% and −30%. The enantioselectivity mechanism was explored from two perspectives: refractive index differences of two enantiomorphs and 3D helical optical forces. Study of the thermodynamic mechanism was insufficient to explain the outcomes. Conversely, the 3D helical optical force mechanism revealed that the forces acting on EDS clusters in solution induced helical fluid motion, driving EDS nucleation, with the helicity of fluid motion determining the crystal’s chirality. This approach will present new insights into chirality in industrial and research fields, with potential applications in regard to improving optical resolution and addressing the origin of homochirality.
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14 February 2024
Research Article|
February 12 2024
Enantioselective control in chiral crystallization of ethylenediamine sulfate using optical trapping with circularly polarized laser beams
Teruki Sugiyama
;
Teruki Sugiyama
a)
(Conceptualization, Funding acquisition, Methodology, Project administration, Resources, Supervision, Writing – original draft)
1
Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
, 1001 University Rd., Hsinchu 300093, Taiwan
2
Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
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Tung-Ming Lin
;
Tung-Ming Lin
(Data curation, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft)
1
Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
, 1001 University Rd., Hsinchu 300093, Taiwan
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Hao-Tse Su
;
Hao-Tse Su
(Visualization)
1
Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
, 1001 University Rd., Hsinchu 300093, Taiwan
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An-Chieh Cheng
;
An-Chieh Cheng
(Investigation, Writing – review & editing)
3
Research Institute for Electronic Science, Hokkaido University
, Sapporo 060-0812, Japan
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Keiji Sasaki
Keiji Sasaki
a)
(Conceptualization, Writing – review & editing)
3
Research Institute for Electronic Science, Hokkaido University
, Sapporo 060-0812, Japan
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Teruki Sugiyama
1,2,a)
Tung-Ming Lin
1
Hao-Tse Su
1
An-Chieh Cheng
3
Keiji Sasaki
3,a)
1
Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
, 1001 University Rd., Hsinchu 300093, Taiwan
2
Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
3
Research Institute for Electronic Science, Hokkaido University
, Sapporo 060-0812, Japan
J. Chem. Phys. 160, 064502 (2024)
Article history
Received:
November 03 2023
Accepted:
December 28 2023
Citation
Teruki Sugiyama, Tung-Ming Lin, Hao-Tse Su, An-Chieh Cheng, Keiji Sasaki; Enantioselective control in chiral crystallization of ethylenediamine sulfate using optical trapping with circularly polarized laser beams. J. Chem. Phys. 14 February 2024; 160 (6): 064502. https://doi.org/10.1063/5.0186018
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