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On the Chiral Z′ = 2 Crystal Structure of [Cu2(H2valdien)2](NO3)2 [H2valdien = N1,N3-bis(3-methoxysalicylidene)diethylenetriamine]

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Goddard,  Richard
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Seidel,  Rüdiger W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Noor, S., Goddard, R., Kumar, S., Ahmad, N., Sabir, S., Mitra, P., et al. (2018). On the Chiral Z′ = 2 Crystal Structure of [Cu2(H2valdien)2](NO3)2 [H2valdien = N1,N3-bis(3-methoxysalicylidene)diethylenetriamine]. Journal of Chemical Crystallography, 48(4), 164-169. doi:10.1007/s10870-018-0724-4.


Cite as: https://hdl.handle.net/21.11116/0000-0003-5586-6
Abstract
The crystal and molecular structure of [Cu2(H2valdien)2](NO3)2 (1), whereby H2valdien is the known Schiff base ligand N1,N3-bis(3-methoxysalicylidene)diethylenetriamine, is reported. In 1, two H2valdien ligands join two CuII ions in a chelate–spacer–chelate mode, in which the protonated aliphatic secondary amine moieties represent the spacers, to form a double helix. Both CuII ions in the homodinuclear cationic complex exhibit similar distorted square-planar N2O2 coordination spheres. The axially chiral molecular structure of the [Cu2(H2valdien)2]2+ complex features intramolecular π···π stacking and N–H⋯O hydrogen bonds in the crystal. Compound 1 crystallizes in the Sohncke space group P21, with a = 14.165(3), b = 13.7755(13), c = 21.1185(4) Å, β = 102.199(4)°, and with two enantiomeric molecules in the asymmetric unit (Z′ = 2). The two crystallographically unique [Cu2(H2valdien)2]2+ enantiomers are related by pseudo inversion symmetry.