Novel molecular switches based on viologen ligand and its transition metal complexes

Document Type : Original Research Article

Authors

1 Department of Chemistry, College of Science, University of Thi-Qar, 64001 Nassiria, Iraq.

2 1 Department of Chemistry, College of Science, University of Thi-Qar, 64001 Nassiria, Iraq.

Abstract

In this work, the viologen derivative was prepared through SN2 nucleophilic substitution of bis (3-chloroacetylacetone) ethylenediimine (AN-Cl) with mono-methylviologen (C1V+). The switching motion between dicationic viologen compound C1V2+AN-Cl.2PF6- and diamagnetic intermolecular π-dimer (C1V+AN-Cl. PF6-)2 was triggered through the reduction by 1 electron/ viologen unit. This molecular switch was followed by UV-Visible absorption spectrometry. The viologen compound C1V2+AN-Cl.2PF6- was titrated with Zn2+, Cu2+, Co2+ and Fe2+ ions to afford metal complexes in the solution of M2+-C1V2+AN-Cl.2PF6-. Moreover, four molecular switches were attained from those metal complexes (M2+-C1V+AN-Cl. PF6-)2 by the chemical reduction stimuli.

Graphical Abstract

Novel molecular switches based on viologen ligand and its transition metal complexes

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