High-pressure preference for reduced water content in porous zinc aspartate hydrates.

ABSTRACT: The zinc aspartate (ZnAsp₂) complex, a common dietary supplement, preferentially crystallizes as the dihydrate (ZnAsp₂·2H₂O) from aqueous solution. Under normal conditions the dihydrate easily transforms into the sesquihydrate (ZnAsp₂·1.5H₂O). The dihydrate crystal structure is triclinic, space group P1, and the sesquihydrate is monoclinic, space group C2/c. However, their structures are closely related and similarly consist of zinc aspartate ribbons parallel to pores accommodating water molecules. These porous structures can breathe water molecules in and out depending on the temperature and air humidity. High pressure above 50 MPa favours the sesquihydrate, as shown by recrystallizations under pressure and compressibility measured by

SUBMITTER: Roszak K 

PROVIDER: S-EPMC7535066 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature