Crystal Growth and Color Tuning of Large Mn(PO3OH)·3H2O Crystals via an Evaporation-Assisted Aqueous Route at Room Temperature
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Updated: Jun 12, 2025

Optimization of Crystal Growth for Neutron Macromolecular Crystallography
Published on: March 13, 2021
1Department of Chemistry and Materials Engineering, Kansai University, 3-3-35 Yamate-cho, Suita 564-8680, Japan.
Abstract:
Large Mn(PO3OH)·3H2O crystals have been prepared from aqueous solutions containing MnCl2 and (NH4)2HPO4 by an evaporation-induced crystal growth technique. The slow solvent evaporation at room temperature maintained the supersaturation of the precursor solution for a long time, resulting in the continuous growth of Mn(PO3OH)·3H2O crystals. The addition of citric acid as a chelating agent and increasing the total volume of the precursor solutions helped to maintain the mild supersaturation conditions for a longer time period, and transparent, unbranched Mn(PO3OH)·3H2O crystals above 2 mm in size were produced by aging for 8 weeks. The large Mn(PO3OH)·3H2O single crystals exhibited a pink color, and the color became stronger by doping with Co2+ ions.
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