Surface-enhanced Raman Spectroscopy of Benzimidazolic Fungicides: Benzimidazole and Thiabendazole

Abstract

Surface-enhanced Raman Scattering (SERS) spectroscopy is applied to the study of the adsorption of benzoimidazolic fungicides benzimidazole (BIZ) and thiabendazole (TBZ) on silver mirrors. The influence of pH on the adsorption mechanism was investigated. In case of BIZ, two different adsorption mechanisms are deduced depending on the experimental conditions: via the π electrons of the ring in neutral conditions and through an ionic pairing of protonated nitrogen atom with the chloride adsorbed on the metal surface. The SERS spectra of TBZ revealed that most molecules were adsorbed on silver surface by the π electrons in neutral and acidic conditions but in acid conditions, some molecules were adsorbed via the sulfur and nitrogen atoms tilted slightly to the surface.

Spectroscopic investigation (FT-IR and FT-Raman), vibrational assignments, HOMO–LUMO, NBO, MEP analysis and molecular docking study of 2-(4-hydroxyphenyl)-4,5-dimethyl-1H-imidazole 3-oxide

“…The bond angles of C 2 -C 3 -C 4 (120.3 Å) and C 2 -C 1 -C 6 (118.3 Å), which is agreement with literature [36]. For the imidazole ring the bond angles of N 14 -C 13 -N 15 and N 14 -C 19 [45] reported the bond length of C 18 -C 19 as 1.3827 Å.…”

Adsorption of 2-mercaptopyridine and 4-mercaptopyridine on a silver surfaces investigated by SERS spectroscopy

“…In the meanwhile, silver ions were reduced and deposited onto the glass plate to form a fine silver film called a silver mirror. After withdrawing the silver mirror from a culture dish, it was washed with distilled water [17]. Aqueous silver sol was prepared In this study, the 2-mercaptopyridine (2-MPY) and 4-mercaptopyridine (4-MPY) on to silver mirror and silver sol substrates have been studied by surface enhanced Raman scattering (SERS).…”

Spectroscopic and theoretical characterization of 2-(4-methoxyphenyl)-4,5-dimethyl-1H-imidazole 3-oxide

“…Minitha et al [36] reported tN-H at 3469 cm À1 , dN-H at 1300 cm À1 and cN-H at 455 cm À1 . Kim et al reported [37] N-H deformation bands at 549, 1484 cm À1 in the Raman spectrum and at 556, 1495 cm À1 theoretically for benzimidazole and Malek et al [38] reported modes at 1394, 680 cm À1 theoretically as N-H deformation modes.…”