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[Sr(C4H2O4)(OH2)3]·H2O is monoclinic, P21/n, witha=11.476(2),b=7.027(1),c=12.344(2) Å, ß=115.74(3)°,V=896.67 Å3,Z=4. The Sr atom is surrounded by nine oxygen atoms which come from four different maleate anions and three water molecules. The Sr-O distances range from 2.546(2) to 2.808(2) Å. The C-O distances are equal within the standard deviation 1.263(3) to 1.258(3) Å). In the maleate anion, the planes that contain the carboxylate groups form an angle of 74.44(9)°. Both carboxylate groups deviate significantly from planarity. The different coordination modes of the carboxylate group and the extensive hydrogen bonding present are responsible for the polymeric nature of the structure.