title: Crystal structure of trans-di-chlorido-(1,4,8,11-tetra-aza-undecane-κ(4) N)chromium(III) perchlorate determined from synchrotron data.
abstract: The structure of the title complex, [CrCl2(2,3,2-tet)]ClO4 (2,3,2-tet is 1,4,8,11-tetra-aza-undecane, C7H20N4), has been determined from synchrotron data. The Cr(III) ion is coordinated by the four N atoms of the 1,4,8,11-tetra-aza-undecane ligand in the equatorial plane and two chloride ions in an axial arrangement, displaying a slightly distorted octa-hedral coordination environment. The two H atoms of the secondary amines are grouped on the same side of the equatorial N4 plane (meso-RS conformation). The Cr-N bond lengths range from 2.069 (2) to 2.084 (2) Å, while the mean Cr-Cl bond length is 2.325 (2) Å. The crystal structure is stabilized by inter-molecular hydrogen-bonding inter-actions between the primary and secondary amine groups of the 2,3,2-tet ligands, the Cl ligands and the O atoms of the perchlorate counter-anion, forming corrugated layers parallel to (010).
authors.affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea.
authors.forename: Dohyun
authors.initials: D
authors.lastname: Moon
authors.affiliation: Department of Chemistry, Andong National University, Andong 36729, Republic of Korea.
authors.forename: Jong-Ha
authors.initials: JH
authors.lastname: Choi
keywords: 1,4,8,11-tetra­aza­undeca­ne; chloride ligand; chromium(III) complex; crystal structure; hydrogen bonding; synchrotron radiation; trans–meso (RS) conformation