title: Crystal structure of trans-di-fluoridotetra-kis(pyridine-κN)chromium(III) tri-chlorido-(pyridine-κN)zincate monohydrate from synchrotron data.
abstract: In the asymmetric unit of the title compound, [CrF2(C5H5N)4][ZnCl3(C5H5N)]·H2O, there are two independent complex cations, one tri-chlorido-(pyridine-κN)zincate anion and one solvent water mol-ecule. The cations lie on inversion centers. The Cr(III) ions are coordinated by four pyridine (py) N atoms in the equatorial plane and two F atoms in a trans axial arrangement, displaying a slightly distorted octa-hedral geometry. The Cr-N(py) bond lengths are in the range 2.0873 (14) to 2.0926 (17) Å while the Cr-F bond lengths are 1.8609 (10) and 1.8645 (10) Å. The [ZnCl3(C5H5N)](-) anion has a distorted tetra-hedral geometry. The Cl atoms of the anion were refined as disordered over two sets of sites in a 0.631 (9):0.369 (9) ratio. In the crystal, two anions and two water mol-ecules are linked via O-H⋯Cl hydrogen bonds, forming centrosymmetric aggregates. In addition, weak C-H⋯Cl, C-H⋯π and π-π stacking inter-actions [centroid-centroid distances = 3.712 (2) and 3.780 (2)Å] link the components of the structure into a three-dimensional network.
authors.affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea.
authors.forename: Dohyun
authors.initials: D
authors.lastname: Moon
authors.affiliation: Department of Chemistry, Andong National University, Andong 760-749, Republic of Korea.
authors.forename: Jong-Ha
authors.initials: JH
authors.lastname: Choi
keywords: chromium(III) complex; crystal structure; fluoride ligand; pyridine ligand; trans-isomer