Synthesis and spectral studies of copper complexes using a N-octylated bis benzimidazole diamide ligand

Copper nano composites functionalized by bis-benzimidazole diamide ligand: Effect of size, co-anion dependent conductivity and band gap studies

“…Protons of the linker benzene show only a very slight shifting. Loss of splitting, downfield shifting and slight broadening is indicative of slight paramagnetic surroundings which confirms that copper in the nano-particles exists in the þ1 oxidation state [38]. The green colored nano-particles did not give rise to 1 H NMR spectra under identical conditions, confirming that the oxidation state of these nano particles is þ2.…”

“…The splitting and shifting of the amide I and amide II bands has been assigned to the binding of the amide functionality to the Copper ions. Similarly, benzimidazole, n C ] NeC ] C vibrational band is shifted from 1441 cm À1 to 1455 cm À1 , while the benzene ring vibrations appear at 749 cm À1 [21,38].…”

“…This change is reflected in the quantum yields as reported in. The quantum yields have been calculated by utilizing the formula [38]:…”