A study on multifunctional protein fibre with UV protection, moth repellency and antibacterial properties using ESIPT core containing benzimidazole and benzothiazole based functional acid azo dyes

Synthesis, Characterization and Antimicrobial Activity of Some New Benzimidazole Derivatives Bearing the Salicyl Moiety

“…The melting points of the dichloro derivatives (1)(2)(3)(4)(5)(6)(7)(8), between 305 and 358°C, are higher than those of the dimethyl derivatives (9)(10)(11)(12)(13)(14)(15)(16), between 276 and 324°C. It is observed that the 5-substitution raise the melting point: 5-OH derivatives, 3 and 11, have melting points of 355 and 324°C, 5-methoxy derivatives, 4 and 12, have 358 and 293°C, and 5-methyl derivatives, 7 and 15, have melting points of 349 and 285° C, respectively.…”

“…It is seen that the dichloro derivatives (1-8) shift the emission band to higher wavelength (red-shift) according to the dimethyl derivatives. The maximum emission wavelengths of the dichloro derivatives appear at the range of 441-521 nm, while those of dimethyl derivatives (9)(10)(11)(12)(13)(14)(15)(16) range is in 422-495 nm.…”

“…The C-Cl stretching vibrations of could be detected at the range 657-684 cm − 1 as medium bands at the compounds 1-8. Methoxy (4,5,6,12,13,14) and methyl groups (7,8,(9)(10)(11)(12)(13)(14)(15)(16) give medium or weak bands in the 2850-3000 cm − 1 range due to the C-H stretch.…”

“…At a glance, Table 1 shows us that the dimethyl derivatives (9)(10)(11)(12)(13)(14)(15)(16) are generally more active towards the microorganisms than the dichloro derivatives. It is observed that the compound 13 which is effective against all microorganisms, shows the broadest activity.…”

“…Many benzimidazole based compounds have been found various applications in the textile industry as optical brighteners [11], or as dyes for dyeing wool and silk bres [12]. Some of its derivatives are also used as herbicides [13], pesticides [14] and as corrosion inhibitors for metal and alloys [15][16].…”