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Crystal structure of bis[(oxalato-κ²O¹,O²)(1,4,8,11-tetraazacyclotetradecane-κ4N)chromium(III)] dichromate octahydrate from synchrotron X-ray data.
- Source :
-
Acta Crystallographica Section E: Crystallographic Communications . Mar2017, Vol. 73 Issue 3, p403-406. 11p. - Publication Year :
- 2017
-
Abstract
- The asymmetric unit of the title compound, [Cr(C2O4)(C10H24N4)]2[Cr2O7]·-8H2O (C10H24N4 = 1,4,8,11-tetraazacyclotetradecane, cyclam; C2O4 = oxalate, ox) contains one [Cr(ox)(cyclam)]+ cation, one half of a dichromate anion that lies about an inversion centre so that the bridging O atom is equally disordered over two positions, and four water molecules. The terminal O atoms of the dichromate anion are also disordered over two positions with a refined occupancy ratio 0.586 (6):0.414 (6). The CrIII ion is coordinated by the four N atoms of the cyclam ligand and one bidentate oxalato ligand in a cis arrangement, resulting in a distorted octahedral geometry. The Cr--N(cyclam) bond lengths are in the range 2.069 (2)-2.086 (2) Å, while the average Cr--O(ox) bond length is 1.936 Å. The macrocyclic cyclam moiety adopts the cis-V conformation. The dichromate anion has a staggered conformation. The crystal structure is stabilized by intermolecular hydrogen bonds involving the cyclam N--H groups and water O--H groups as donors, and the O atoms of oxalate ligand, water molecules and the Cr2O72- anion as acceptors, giving rise to a three-dimensional network. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20569890
- Volume :
- 73
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Acta Crystallographica Section E: Crystallographic Communications
- Publication Type :
- Academic Journal
- Accession number :
- 121771690
- Full Text :
- https://doi.org/10.1107/S2056989017002614