Abstract
A series of five benzothiazolylhydrazone ligands 3a–3e and their seven novel Ru(II) polypyridine complexes 4a–4d, 5a, 5d, 5e of the type [Ru(N–N)2(L)]Cl2, where (N–N)2 is 2,2′-bipyridine (bpy)2 or 1,10-phenanthroline (phen)2 and (L) is ligands 3a–3e, have been synthesized and characterized by elemental analysis, IR, 1H NMR, electronic absorption, and emission spectral studies. The interpretation of the analytical data revealed that the ligands coordinate with the metal ion in a bidentate fashion through azomethine nitrogen and phenolic oxygen to form complexes. These ligands and complexes also exhibit absorption and luminescence properties.
Highlights
In the last two decades, Ru(II) complexes have been widely studied in the field of inorganic chemistry [1,2,3,4,5]
The ligands utilized in the present investigation were synthesized by the condensation reaction 2-hydrazinobenzothiazole with substituted acetophenones. 2-Hydrazinobenzothiazole was prepared by the addition of hydrazine hydrate (1 mmol) to the warm solution of 2mercaptobenzothiazole (1 mmol) in absolute ethyl alcohol (10 mL), and the mixture was refluxed on a water bath for 4 hours or until H2S gas ceased to evolve
The five benzothizolyl ligands 3a–3e were synthesized by utilizing the 2-hydrazinobenzothiazole via condensation reaction with substituted acetophenones. These synthesized ligands 3a–3e were further reacted with hydrated Ru(II) 2,2 bipyridine chloride or Ru(II) 1,10 phenanthroline chloride to obtain polypyridine complexes 4a–4d, 5a, 5d, and 5e
Summary
In the last two decades, Ru(II) complexes have been widely studied in the field of inorganic chemistry [1,2,3,4,5]. The polypyridine complexes of Ru(II) have been studied extensively with the point of interest being their rich and well characterized photophysics [6, 7]. Transition metal complexes have been used extensively in the fore front of fields such as probes of DNA structure, DNAdependent electron transfer, and site-specific DNA cleavage [8,9,10]. In the context of this, we synthesized and characterized five ligands 2-(2-hydroxy-3-iodo-5-chloro acetophenyl) benzothiazolylhydrazone 3a, 2-(2,4-dihydroxy acetophenyl) benzothiazolylhydrazone 3b, 2-(2,5-dihydroxy acetophenyl) benzothiazolylhydrazone 3c, 2-(2-hydroxy-5chloro acetophenyl) benzothiazolylhydrazone 3d, 2-(2-hydroxy-4-methyl-5-chloro acetophenyl) benzothialylhydrazone 3e, and their seven Ru(II) polypyridine complexes: [Ru(bpy)23a]Cl2 4a, [Ru(bpy)23b]Cl2 4b, [Ru(bpy)23c]Cl2 4c, [Ru(bpy)23d]Cl2 4d, [Ru(phen)23a]Cl2 5a, [Ru(phen)23d]Cl2 5d, and [Ru(phen)23e]Cl2 5e
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