Bis[μ-3-(2-hydroxyethyl)-2-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-9-olato-κ3 N,O:O]bis[aquachloridocopper(II)]

In the dinuclear centrosymmetric copper(II) title compound, [Cu2(C11H11N2O2)2Cl2(H2O)2], each CuII ion has a slightly distorted trigonal-bipyramidal geometry and is coordinated by one N and one O atom from one 3-(2-hydroxyethyl)-2-methyl-4-oxopyrido[1,2-a]pyrimidin-9-olate ligand, another O atom from the second ligand, one water molecule and one Cl atom. The crystal structure involves intermolecular C—H⋯Cl, O—H⋯Cl and O—H⋯O hydrogen bonds

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SG2256).
The bond lengths and angles are shown in Table 1 Table 2.

S2. Experimental
All chemicals used (reagent grade) were commercially available. a aqueous solution (5 ml) of CuCl 2 (28 mg, 0.1 mmol) was added with constant stirring to a ethanol solution (10 ml) containing 3-(2-hydroxyethyl)-2-methyl-9-hydroxylpyrido[1,2-a] pyrimidin-4-one (22 mg, 0.1 mmol) then filtered off. After a few days, colorless well shaped single crystals in the form of prisms deposited in the other liquid. They were separated off, washed with cold ethanol and dried in air at room temperature.

S3. Refinement
H atoms bound to carbon were included in calculated positions and treated in the subsequent refinement as riding atoms, with C-H = 0.94 Å and U iso (H) = 1.2U eq (C). The H of hydroxyl and water were refined independently with isotropic displacement parameters.  The molecular structure of the title compound with the atom-numbering scheme and all hydrogen atoms. Displacement ellipsoids are drawn at the 30% probability level.   Three-dimensional net framework of the title compound viewed along a axis. Hydrogen bonds are shown as dashed lines.
Displacement ellipsoids are drawn at the 30% probability level.