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Europium-based dinuclear triple-stranded helicate vs. tetranuclear quadruple-stranded helicate : effect of stoichiometric ratio on the supramolecular self-assembly

Author
Organization
Abstract
Two europium-based helicates, namely the dinuclear triple-stranded helicate [Eu2L3] (1) and tetranuclear quadruple-stranded helicate [Eu4L4(NO3)](3+) (2), were achieved by the self-assembly of the succinohydrazone derived bis-tridentate ligand (H2L) and Eu3+ ions in 1:1 and 1:2 ratios, respectively. Both the helicates were characterized by single-crystal X-ray analysis. Structural analysis of both the helicates revealed optically inactive 50:50 mixtures of left- (Lambda) and right-hand (Delta) helicates in one unit cell. In 1, both the europium centers lie along the three-fold axis whereas in 2, four europium centers are arranged in a triangular fashion around the four-fold axis, which passes through the center of the quadruple stranded helicate. In 2, the presence of a nitrate ion on the nucleation of the aesthetically pleasing tetranuclear quadruple stranded helicate is significant. Apart from the molar ratio, the role of the bridging modes of the ligand, anion and noncovalent interaction on the self-assembly of two helicates are also discussed.
Keywords
SLOW MAGNETIC-RELAXATION, LANTHANIDE COMPLEXES, COORDINATION CHEMISTRY, DIRECTED SYNTHESIS, CU-I, LUMINESCENT, LIGANDS, POLYMERS, ARCHITECTURES, REFRIGERATION, Supramolecular chemistry, Self-assembly, Helical structures, Lanthanides

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MLA
Malviya, Amita, et al. “Europium-Based Dinuclear Triple-Stranded Helicate vs. Tetranuclear Quadruple-Stranded Helicate : Effect of Stoichiometric Ratio on the Supramolecular Self-Assembly.” EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, vol. 2015, no. 17, 2015, pp. 2901–07, doi:10.1002/ejic.201500301.
APA
Malviya, A., Jena, H., Mondal, A. K., & Konar, S. (2015). Europium-based dinuclear triple-stranded helicate vs. tetranuclear quadruple-stranded helicate : effect of stoichiometric ratio on the supramolecular self-assembly. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2015(17), 2901–2907. https://doi.org/10.1002/ejic.201500301
Chicago author-date
Malviya, Amita, Himanshu Jena, Amit Kumar Mondal, and Sanjit Konar. 2015. “Europium-Based Dinuclear Triple-Stranded Helicate vs. Tetranuclear Quadruple-Stranded Helicate : Effect of Stoichiometric Ratio on the Supramolecular Self-Assembly.” EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2015 (17): 2901–7. https://doi.org/10.1002/ejic.201500301.
Chicago author-date (all authors)
Malviya, Amita, Himanshu Jena, Amit Kumar Mondal, and Sanjit Konar. 2015. “Europium-Based Dinuclear Triple-Stranded Helicate vs. Tetranuclear Quadruple-Stranded Helicate : Effect of Stoichiometric Ratio on the Supramolecular Self-Assembly.” EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2015 (17): 2901–2907. doi:10.1002/ejic.201500301.
Vancouver
1.
Malviya A, Jena H, Mondal AK, Konar S. Europium-based dinuclear triple-stranded helicate vs. tetranuclear quadruple-stranded helicate : effect of stoichiometric ratio on the supramolecular self-assembly. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2015;2015(17):2901–7.
IEEE
[1]
A. Malviya, H. Jena, A. K. Mondal, and S. Konar, “Europium-based dinuclear triple-stranded helicate vs. tetranuclear quadruple-stranded helicate : effect of stoichiometric ratio on the supramolecular self-assembly,” EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, vol. 2015, no. 17, pp. 2901–2907, 2015.
@article{8685146,
  abstract     = {{Two europium-based helicates, namely the dinuclear triple-stranded helicate [Eu2L3] (1) and tetranuclear quadruple-stranded helicate [Eu4L4(NO3)](3+) (2), were achieved by the self-assembly of the succinohydrazone derived bis-tridentate ligand (H2L) and Eu3+ ions in 1:1 and 1:2 ratios, respectively. Both the helicates were characterized by single-crystal X-ray analysis. Structural analysis of both the helicates revealed optically inactive 50:50 mixtures of left- (Lambda) and right-hand (Delta) helicates in one unit cell. In 1, both the europium centers lie along the three-fold axis whereas in 2, four europium centers are arranged in a triangular fashion around the four-fold axis, which passes through the center of the quadruple stranded helicate. In 2, the presence of a nitrate ion on the nucleation of the aesthetically pleasing tetranuclear quadruple stranded helicate is significant. Apart from the molar ratio, the role of the bridging modes of the ligand, anion and noncovalent interaction on the self-assembly of two helicates are also discussed.}},
  author       = {{Malviya, Amita and Jena, Himanshu and Mondal, Amit Kumar and Konar, Sanjit}},
  issn         = {{1434-1948}},
  journal      = {{EUROPEAN JOURNAL OF INORGANIC CHEMISTRY}},
  keywords     = {{SLOW MAGNETIC-RELAXATION,LANTHANIDE COMPLEXES,COORDINATION CHEMISTRY,DIRECTED SYNTHESIS,CU-I,LUMINESCENT,LIGANDS,POLYMERS,ARCHITECTURES,REFRIGERATION,Supramolecular chemistry,Self-assembly,Helical structures,Lanthanides}},
  language     = {{eng}},
  number       = {{17}},
  pages        = {{2901--2907}},
  title        = {{Europium-based dinuclear triple-stranded helicate vs. tetranuclear quadruple-stranded helicate : effect of stoichiometric ratio on the supramolecular self-assembly}},
  url          = {{http://dx.doi.org/10.1002/ejic.201500301}},
  volume       = {{2015}},
  year         = {{2015}},
}

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