title: Crystal structure of bis-[trans-di-chlorido-bis(propane-1,3-di-amine-κ2N,N')chromium(III)] dichromate from synchrotron data.
abstract: The structure of the title compound, [CrCl2(tn)2]2[Cr2O7] (tn = propane-1,3-di-amine; C3H10N2), has been determined from synchrotron data. The asymmetric unit contains one CrIIIcomplex cation and half a [Cr2O7]2-anion. In the complex cation, the CrIIIion is coordinated by the four N atoms of two propane-1,3-di-amine (tn) ligands in the equatorial plane and by two Cl atoms in atransconfiguration, displaying a distorted octa-hedral coordination sphere. The two six-membered rings in the complex cation have anantichair-chair conformation with respect to each other. The mean Cr-N(tn) and Cr-Cl bond lengths are 2.09 (1) and 2.320 (2) Å, respectively. The slightly bent dichromate anion is disordered over two sets of sites (occupancy ratio = 0.7:0.3) and has a staggered conformation. The crystal structure is stabilized by inter-molecular hydrogen bonds involving the NH2groups of the tn ligands as donors and the O atoms of the [Cr2O7]2-anion and chlorido ligands as acceptors.
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: Keon Sang
authors.initials: KS
authors.lastname: Ryoo
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; crystal structure; dichromate anion; hydrogen bonding; propane-1,3-di­amine; synchrotron radiation; trans–anti conformation