[4,4′-(Ethane-1,2-diyldinitrilo)­bis­(pent-2-en-2-olato)]copper(II) 0.25-hydrate

In the title compound, [Cu(C₁₂H₁₈N₂O₂)]·0.25H₂O, the coordination of the O,N,N′,O′-tetra­dentate ligand results in a cis-CuN₂O₂ square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex mol­ecule is close to planar (r.m.s. deviation = 0.047 Å). The uncoordinated water mol­ecule (O-atom site symmetry 2) was modelled as half occupied. In the crystal, C—H...O_w and O_w—H...O (w = water) hydrogen bonds link the components into layers parallel to ab plane.

Methyl 2-butyl-4-hy­droxy-1,1-dioxo-2H-1,2-benzothia­zine-3-carboxyl­ate

In the title compound, C₁₄H₁₇NO₅S, the thia­zine ring adopts a half-chair conformation. The mol­ecule exhibits an intra­molecular O—H...O hydrogen bond, which forms a six-membered S(6) ring motif. The planes of the benzene and thia­zine rings are inclined at a dihedral angle of 15.30 (12)°.