Tridentate benzimidazole ligand and its metal complexes: Synthesis, characterization, photo physical and sensor properties

Abstract

A tridentate bisbenzimidazole‐pyridine ligand (L‐C5) with two pentyl side‐units and its metal complexes with Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+ metal ions were synthesized and characterized. The structures of the ligand (L‐C5) and its five coordinate [Mn(L‐C5)Cl2] were elucidated by single crystal X‐ray diffraction studies. The absorption and photoluminescence properties of the compounds were studied in solution media. The ligand is highly fluorescent, and binding of the metal ions to the ligand has caused significant changes in the emission band (shift or quenching). Moreover, the effect of aggregation on UV–Vis. absorption and emission properties was examined in MeOH‐water mixtures. The ligand was found to show aggregation‐induced quenching in the MeOH‐water mixture. The ligand was also screened for its colorimetric and fluorometric sensing ability of several metal ions [Na+, K+, Mg2+, Al3+, Ca2+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Hg2+, Pb2+]. The ligand showed selective sensing ability towards Zn2+, and the limit of detection was calculated as 3.09 × 10−7 m. The ligand also showed a distinguishable color change in the presence of Fe2+ under daylight.

Comprehensive Insights into Medicinal Research on Imidazole-Based Supramolecular Complexes

“…A tridentate dibenzimidazole-pyridine ligand with two pentyl side chains and its metal complex V23 with Zn (II) ions were synthesized. This ligand showed a selective sensing ability toward Zn (II) ions, and the detection limit was calculated as 3.09 × 10 −7 M [ 507 ].…”

Imidazoles as Serotonin Receptor Modulators for Treatment of Depression: Structural Insights and Structure–Activity Relationship Studies

“…(o) Imidazole-based anthracene structure detection limit of Zn (II): 1.0 × 10 −9 M [ 65 ]. (p) Tridentate dibenzimidazole–pyridines have a detection limit of 3.09 × 10 −7 M toward Zn (II) ions [ 66 ]. (q) Imidazole-based supermolecules as probes for Cu (II) detection (allyl-substituted imidazole derivative with a detection limit for cupric ion (Cu 2+ ) of 1.01 nM [ 67 ]; dibenzimidazole derivative with a detection limit of 0.094 μM within a 1 s time period [ 68 ]; tetraphenyl ethylene-functionalized aryl imidazole-derivative detection limit of aqueous solubilized Cu (II) at 34.8 nM [ 69 ]).…”

Computational design and molecular modeling of the interaction of nicotinic acid hydrazide nickel-based complexes with H2S gas

“…31 Among the transition metal oxides, nickel oxide has attracted much attention due to its properties and applications. 32 While the vast majority of research works on the application of metal complexes as sensors has been devoted to biological systems, [33][34][35] there has been limited research progress on environmental gas sensing properties. Hence, this research work is focused on the synthesis, characterization, and the theoretical modelling of the gas (H 2 S) sensing properties of nickel complexes of nicotinic acid hydrazide ligand.…”