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Impact of molecular symmetry on crystallization pathways in highly supersaturated KH2PO4 solutions.


ABSTRACT: Solute structure and its evolution in supersaturated aqueous solutions are key clues to understand Ostwald's step rule. Here, we measure the structural evolution of solute molecules in highly supersaturated solutions of KH2PO4 (KDP) and NH4H2PO4 (ADP) using a combination of electrostatic levitation and synchrotron X-ray scattering. The measurement reveals the existence of a solution-solution transition in KDP solution, caused by changing molecular symmetries and structural evolution of the solution with supersaturation. Moreover, we find that the molecular symmetry of H2PO4- impacts on phase selection. These findings manifest that molecular symmetry and its structural evolution can govern the crystallization pathways in aqueous solutions, explaining the microscopic origin of Ostwald's step rule.

SUBMITTER: Cho YC 

PROVIDER: S-EPMC11006877 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature

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Impact of molecular symmetry on crystallization pathways in highly supersaturated KH<sub>2</sub>PO<sub>4</sub> solutions.

Cho Yong Chan YC   Lee Sooheyong S   Wang Lei L   Lee Yun-Hee YH   Kim Seongheun S   Lee Hyun-Hwi HH   Lee John Jonghyun JJ   Lee Geun Woo GW  

Nature communications 20240410 1


Solute structure and its evolution in supersaturated aqueous solutions are key clues to understand Ostwald's step rule. Here, we measure the structural evolution of solute molecules in highly supersaturated solutions of KH<sub>2</sub>PO<sub>4</sub> (KDP) and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> (ADP) using a combination of electrostatic levitation and synchrotron X-ray scattering. The measurement reveals the existence of a solution-solution transition in KDP solution, caused by changing mol  ...[more]

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