Abstract
In the system l-cysteine-H3PO3-H2O, a new salt with a dimeric cation, (l-CysH···l-Cys)(H2PO3), has been obtained. The compound exhibits incongruent solubility and is synthesized using an equimolar ratio of l-cysteine and phosphorous acid. It crystallizes in the orthorhombic space group P212121. The dimeric (l-CysH···l-Cys) cation is formed due to a strong O-H···O hydrogen bond with an O···O distance of 2.498 (2) Å. Phosphite anions in the structure are linked to infinite chains. An IR spectrum is recorded and discussed based on its structure.
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