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Alkali metal ion mediated self-assembly of vanadium(V) ions and pyrazole based polydentate ligands leading to the formation of helix, double helix and supramolecular cage-like structures |
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| Authors: | Arijit HazraSamik Gupta Somnath RoyTarak Nath Mandal Kinsuk DasSaugata Konar Atanu JanaSangita Ray Ray J ButcherSusanta Kumar Kar |
| Institution: | a Department of Chemistry, University College of Science, 92, A.P.C. Road, Kolkata 700 009, India b Department of Chemistry, Haldia Government College, Debhog, Purba Midnapur, PIN 721657, India c Department of Chemistry, Howard University, 2400 Sixth Street, N.W., Washington, DC 200 59, USA |
| Abstract: | The anionic cis-dioxovanadium(V) complex species LVO2− and L1VO2− of two tridentate ONO ligands (H2L and H2L1) can bind alkali metal ions in a bis-monodentate fashion like a bridging carboxylate group. Here H2L (N′-(E)-(2-hydroxyphenyl)methylidene]-3-methyl-1H-pyrazole-5-carbohydrazide) and H2L1 (N′-(1E)-1-(2-hydroxyphenyl) ethylidene]-3-methyl-1H-pyrazole-5-carbohydrazide) are Schiff base ligands generated by the condensation of 5-methyl 3-pyrazole carbohydrazide with salicylaldehyde and o-hydroxy acetophenone. The six products thus obtained are water soluble polymeric compounds in which the complementary units are held together by the simultaneous use of hydrogen bonding and coulombic interactions. L1VO2Li(H2O)2]∞ (2), LVO2Na(H2O)2]∞ (3) and LVO2K(H2O)2]∞ (5) have been crystallographically characterized. Crystallographic characterization reveals that 2 and 3 are polymeric helicates and 5 is a polymeric cluster with L1VO2− or LVO2− units bridging the labile alkali metal ions which occupy positions on the axis of the polymeric chain. |
| Keywords: | V(V) complexes Schiff base ligand Heterocycle based ligands Heterometallic coordination polymer X-ray crystallography |
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