Di-μ-chlorido-bis(chlorido{8-[2-(dimethylamino)ethylamino]quinoline}cadmium) ethanol monosolvate

In the title bimetallic complex, two Cd2+ metal ions are linked by a pair of Cl− ions and their coordinations completed by another Cl− ion and three N atoms.

An intramolecular N-HÁ Á ÁCl hydrogen bond (Table 1, Fig. 3) is observed in the dinuclear molecule. The complex also donates an N-HÁ Á ÁO hydrogen bond to the ethanol solvent molecule and accepts an O-HÁ Á ÁCl contact from the same molecule to generate an R(6) 2 2 loop. In the extended structure, the quinoline ring systems of neighbouring complex units are involved in weak aromaticstacking interactions. The groups involved are related by inversion symmetry with a c(i)Á Á Ác(i) 0 separation of 3.93 (1) Å [c(i) = the midpoint of the C9-C10 bond of the C5-C13/N3 ring system]. If a second longer inversion-related contact c(ii)Á Á Ác(ii) 0 of 4.56 (1) Å [c(ii) = midpoint of the C22-C23 bond of the C18-C26/N6 ring system] is considered to be a significant interaction, infinite chains running parallel to [101] result (Fig. 4).

Figure 3
The asymmetric unit of I showing the intramolecular contact (a) and hydrogen bonding with the ethanol solvent molecule (b and c).

Figure 1
The molecular structure of I showing 50% displacement ellipsoids.

Figure 2
Detail of a Cl-(Cd 2 Cl 2 )-Cl fragment of I showing the deviation of Cd2 from the plane of Cl2, Cd1 and Cl3 as a green dotted line.
room temperature under a positive nitrogen pressure and the mixture was stirred at room temperature for several hours. The solution was then warmed to dissolve the material and the product was recrystallized on cooling to produce colourless crystals of I.

Refinement
Crystal data, data collection and structure refinement details are summarized in Table 2.
Special details Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. Refinement. The H atoms were positioned geometrically and refined using a riding model with U iso (H) = 1.2U eq (carrier) or 1.5U eq (methyl C). The methyl groups were allowd to rotate, but not to tip, to best fit the electron density.