title: Crystal structure ofcis-di-chlorido-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κ4N)chromium(III) (oxalato-κ2O1,O2)(1,4,8,11-tetra-aza-cyclo-tetra-decane-κ4N)chromium(III) bis(perchlorate) from synchrotron data.
abstract: In the asymmetric unit of the title compound, [CrCl2(C10H24N4)][Cr(C2O4)(C10H24N4)](ClO4)2(C10H24N4= 1,4,8,11-tetra-aza-cyclo-tetra-decane, cyclam; C2O4= oxalate, ox), there are two independent halves of the [CrCl2(cyclam)]+and [Cr(ox)(cyclam)]+cations, and one perchlorate anion. In the complex cations, which are completed by application of twofold rotation symmetry, the CrIIIions are coordinated by the four N atoms of a cyclam ligand, and by two chloride ions or one oxalate bidentate ligand in acisarrangement, displaying an overall distorted octa-hedral coordination environment. The Cr-N(cyclam) bond lengths are in the range of 2.075 (5) to 2.096 (4) Å while the Cr-Cl and Cr-O(ox) bond lengths are 2.3358 (14) and 1.956 (4) Å, respectively. Both cyclam moieties adopt thecis-V conformation. The slightly distorted tetra-hedral ClO4-anion remains outside the coordination sphere. The supra-molecular architecture includes N-H⋯O and N-H⋯Cl hydrogen bonding between cyclam NH donor groups, O atoms of the oxalate ligand or ClO4-anions and one Cl ligand as acceptors, leading to a three-dimensional network structure.
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: chloride ligand; chromium(III) complex; cis-V conformation; crystal structure; cyclam; hydrogen bonding; oxalato ligand; synchrotron radiation