The title compound, (C6H8N)2[CuCl4], is composed of two 3-methyl­pyridinium cation and one tetra­chloridocuprate(II) anion. The geometry around the copper(II) ion is that of a distorted tetra­hedron. In the crystal structure, the anions and cations are linked by three different N—H⋯Cl hydrogen bonds. In addition, the crystal structure exhibits aromatic π–π inter­actions between the pyridinium rings of two discrete units [centroid–centroid distance = 3.704 (2) Å].

CommentLuminescent coordination compounds have been investigated extensively due to their various potential applications in material sciences (Amendola et al. 2006). Many Zn(II) complexes are known to exhibit an intense fluorescence at room temperature (Yang, et al. 2000; Xu, et al. 2006), and they are proposed as candidates for the fluorescent based organic light-emitting diods (OLED) devices (Evans, et al. 2006). The title compound displays distorted tetrahedral coordination, with two N atoms from ethylenediamine and two O atoms from two acetate ligands. The title compound displays [4 + 2] coordination: the "4" represnets the distorted tetrahedral coordination, while the "2" means the two much longer Zn1-O5 distances of 2.594 (2) Å. The asymmetry of the acetate coordination is reflected in the different C-O distances of 1.229 (2) and 1.280 (2) Å. The Zn1 lies on a crystallographic twofold axis. The dihedral angle between N1-Zn1-N1' and O3-Zn1-O3' planes is 85.54 (7) °, where the prime denotes the symetry operation about the twofold axis. While the dihedral angle between N1-Zn1-N1' and O5-Zn1-O5' planes is 29.96 (7) °. N-H···O hydrogen bonding links molecules into a three-dimensional network. The title compound exhibits an intense blue emission at 444 nm in CHCl 3 upon 368 nm excitation. ExperimentalA solution of zinc acetate (2.195 g, 10.0 mmol) and ethylenediamine (0.601 g, 10.0 mmol) in absolute ethanol (50 ml) was stirred for 8 hrs at room temperature under a nitrogen atmosphere. The resulting colorless solution was allowed to stand at room temperature for two weeks to produce colorless crystals (yield 65.0%) suitable for X-ray diffraction. RefinementApart from those of sp 2 -bound methyl groups, which were located in ΔF syntheses, H atoms were positioned geometrically.Thereafter they were constrained to ride on their carrier atoms, with N-H = 0.90 Å and U iso (H) = 1.2U iso (N) for NH 2 , C-H = 0.97 Å and U iso (H) = 1.2U iso (C) for CH 2 , and C-H = 0.96 Å and U iso (H) = 1.5U iso (C) for CH 3 groups.

The Hg atom in the title complex, [HgCl2(C12H13N3)], adopts a square-pyramidal geometry, being ligated by three N atoms of the tridentate bis­(2-pyridylmeth­yl)amine ligand and two Cl atoms, with one of the latter occupying the apical position. Disorder is noted in the amine portion of the ligand and this was modelled over two sites, with the major component having a site-occupancy factor of 0.794 (14).

Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.007 Å; R factor = 0.026; wR factor = 0.059; data-to-parameter ratio = 24.8.The Hg atom in the title compound, [HgCl 2 (C 12

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.