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Journal of Chemical Crystallography

, Volume 48, Issue 4, pp 164–169 | Cite as

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

  • Shabana Noor
  • Richard Goddard
  • Sarvendra Kumar
  • Nafees Ahmad
  • Suhail Sabir
  • Partha Mitra
  • Rüdiger W. Seidel
Original Paper

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.

Graphical Abstract

The pseudo centrosymmetric chiral Z′ = 2 crystal structure (space group P21) of [Cu2(H2valdien)2](NO3)2, whereby H2valdien is the known Schiff base ligand N1,N3-bis(3-methoxysalicylidene)diethylenetriamine, is reported.

Keywords

Copper Schiff base π⋯π stacking Hydrogen bonding Pseudosymmetry Crystal structure 

Notes

Acknowledgements

This work was supported by grants from the Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India, New Delhi, India (SERB/F/815/2014-15). SN would like to thank the chairman of the Department of Chemistry, Aligarh Muslim University, India, who facilitated this research.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Shabana Noor
    • 1
  • Richard Goddard
    • 2
  • Sarvendra Kumar
    • 3
  • Nafees Ahmad
    • 1
  • Suhail Sabir
    • 1
  • Partha Mitra
    • 4
  • Rüdiger W. Seidel
    • 2
  1. 1.Department of ChemistryAligarh Muslim UniversityAligarhIndia
  2. 2.Max-Planck-Institut für KohlenforschungMülheim an der RuhrGermany
  3. 3.Institute of Functional Nano & Soft MaterialsSoochow UniversitySuzhouPeople’s Republic of China
  4. 4.Indian Association for Cultivation of ScienceKolkataIndia

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