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).
Highlights
CrIII ion is coordinated by the four N atoms of the 1,4,8,11-tetraazaundecane ligand in the equatorial plane and two chloride ions in an axial arrangement, displaying a slightly distorted octahedral coordination environment
The two hydrogen atoms of the conformers may be on the same side (RS) of the equatorial N4 plane or on opposite sides (RR/SS) of this plane
Cr(III) complex with 2,3,2-tet and additional Cl ligands, we report the structure of the title compound, trans-[CrCl2(2,3,2tet)]ClO4, (I), in this communication
Summary
Complexes of linear flexible tetradentate ligands is an interesting field because it has played an important role in extending the concept of stereochemistry. The 1,4,8,11-tetraazaundecane ligand (2,3,2-tet) is a structural isomer of. These two ligands have four nitrogen atoms as donor groups and can adopt three different configurations in chromium(III) complexes with two Figure 1. Schematic representation of the 2,3,2-tet and 2,2,3-tet ligands, and two possible conformational isomers of trans-[CrCl2(2,3,2-tet)]+. E72, 424–427 research communications additional Cl ligands (Choi et al, 2008a,b). Two conformations of meso-RS or racemic-RR/SS isomers with respect to the orientation of the secondary amine hydrogen atoms in the trans isomer are possible (Fig. 1). The two hydrogen atoms of the conformers may be on the same side (RS) of the equatorial N4 plane or on opposite sides (RR/SS) of this plane. Cr(III) complex with 2,3,2-tet and additional Cl ligands, we report the structure of the title compound, trans-[CrCl2(2,3,2tet)]ClO4, (I), in this communication
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