Bis(methyl 3-pyridyl-κN¹-carbamate)bis(propionato-κO)copper(II)–Water (4/1)

The Cu^II centre in the title compound, [Cu(C₃H₅O₂)₂(C₇H₈N₂O₂)₂].0.25H₂O, is situated on an inversion centre and has tetragonally distorted coordination. It is bonded in a trans-square-planar arrangement to the pyridyl N atoms of two methyl 3-pyridylcarbamate molecules [Cu—N1 2.025 (2) Å] and one carboxylate O atom from each of two propionate anions [Cu—O1 1.955 (2) Å]. The axial positions are occupied by the other propionate O atoms [Cu...O2 2.653 (2) Å]. The propionate groups exhibit very small O1—Cu...O2 chelate angles of 54.23 (8)°.

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