Focusing on the high-value development of magnesium resources,magnesium chloride hexahydrate is used as magnesium source to react with D,L-tartaric acid,D-tartaric acid,and L-tartaric acid,respectively,to synthesize Mg(D,L-tart)(H2O)2·3H2O(Product I),Mg(D-tart)(H2O)·1.5H2O(Product Ⅱ),and Mg(D-tart)(Product Ⅲ)under mild conditions.In the normal temperature aqueous solution system,the product I is synthesized,and the best synthesis conditions for Product I are as follows:reaction temperature is-5℃,pH=8.00,the ethanol volume fraction in the system reaches 0.36,and the reaction lasts for 1 h.Product Ⅱ is obtained by using water-ethanol mixing as solvent,and the best reaction conditions are as follows:reaction temperature is 60℃,pH=6.00-7.00,the ethanol volume fraction in the system is 0.46,and the reaction lasts for 24 hours.Product Ⅲ can be prepared under mild hydrothermal conditions or water-DMAC mixed solvent system.The best yield of Product Ⅲ reaches over 94％when the volume concentration of DM AC is 0.55.The influences of the synthesis conditions on the crystal morphology and yield of the products are also investigated.
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