Syntheses and crystal structures of two self-assembled dizinc(II) helicates with novel hydrazone linked polypyridyl ligands

Syntheses and crystal structures of two self-assembled dizinc(II) helicates with novel hydrazone... The rationally designed polydentate ligands, L 1 and L 2 , based on the pyridinyl moiety and the hydrazone fragment have been synthesized to coordinate zinc(II) ions. We utilize pyridine as a rigid core connecting two bipyridines as ligand building blocks with a hydrozone linker for the L 1 . The L 2 has a reversed design in which a bipyridine was used as a hinging-available building block of the ligand core, connecting two pyridazine arms with a hydrazone linker. Two novel helical dizinc(II) complexes were obtained by the reaction of L 1 and L 2 with zinc(II) perchlorate in acetonitrile. The structures of both helicates were confirmed by X-ray diffractometry. Single-stranded helicate Zn 2 L 1 contains two zinc ions bridged by an oxygen atom. Except for the L 2 ligand, no other bridging species were found between the two zinc ions in the double-stranded helicate Zn 2 L 2 2 . The self-assembling process of helicate Zn 2 L 1 in solution state was studied by UV–Vis spectrometric titration experiments. The stepwise formation constants imply a slightly positive cooperative behavior for the formation of helicates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Syntheses and crystal structures of two self-assembled dizinc(II) helicates with novel hydrazone linked polypyridyl ligands

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Publisher
Springer Journals
Copyright
Copyright © 2016 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-016-2426-x
Publisher site
See Article on Publisher Site

Abstract

The rationally designed polydentate ligands, L 1 and L 2 , based on the pyridinyl moiety and the hydrazone fragment have been synthesized to coordinate zinc(II) ions. We utilize pyridine as a rigid core connecting two bipyridines as ligand building blocks with a hydrozone linker for the L 1 . The L 2 has a reversed design in which a bipyridine was used as a hinging-available building block of the ligand core, connecting two pyridazine arms with a hydrazone linker. Two novel helical dizinc(II) complexes were obtained by the reaction of L 1 and L 2 with zinc(II) perchlorate in acetonitrile. The structures of both helicates were confirmed by X-ray diffractometry. Single-stranded helicate Zn 2 L 1 contains two zinc ions bridged by an oxygen atom. Except for the L 2 ligand, no other bridging species were found between the two zinc ions in the double-stranded helicate Zn 2 L 2 2 . The self-assembling process of helicate Zn 2 L 1 in solution state was studied by UV–Vis spectrometric titration experiments. The stepwise formation constants imply a slightly positive cooperative behavior for the formation of helicates.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 25, 2016

References

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