Dichlorido[1-(1,10-phenanthrolin-2-yl)-2-pyridone]copper(II)

In the title mononuclear complex, [CuCl2(C17H11N3O)], the CuII ion is in a distorted square-pyramidal coordination environment. The crystal structure is stabilized by various π–π stacking interactions in which the benzene ring, a pyridine ring and the five-membered CuN2C2 ring are involved. The centroid–centroid distances range from 3.5631 (15) to 3.5666 (16) Å.

In the paper by Tabuchi, Takahashi, Gotoh, Akashi & Ishida [Acta Cryst. (2005), E61, o4215-o4217], the title and the chemical names are incorrect with regard to the position of the carboxy group. The correct title of the original paper should be '3-Carboxypyridinium hydrogen chloranilate' and the chemical names 2-carboxypyridine and 2-carboxypyridinium in the Abstract should be 3-carboxypyridine and 3-carboxypyridinium, respectively.

addenda and errata
In the title mononuclear complex, [CuCl 2 (C 17 H 11 N 3 O)], the Cu II ion is in a distorted square-pyramidal coordination environment. The crystal structure is stabilized by variousstacking interactions in which the benzene ring, a pyridine ring and the five-membered CuN 2 C 2 ring are involved. The centroid-centroid distances range from 3.5631 (15) to 3.5666 (16) Å .

Related literature
For a related structure, see: Liu et al. (2008).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH2647).

Experimental
A 10 ml methanol solution of 1-(1,10-phenanthrolin-2-yl)-2-pyridone (0.1648 g, 0.603 mmol) was added into a 10 ml methanol solution containing CuCl 2 (0.1025 g, 0.601 mmol) and the mixture was stirred for a few minutes. The green single crystals were obtained after the filtrate had been allowed to stand at room temperature for two weeks.

Refinement
All H atoms were placed in calculated positions with C-H = 0.93 Å and refined as riding with U iso (H) = 1.2U eq (C). Fig. 1 Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.