Electronic spectra were collected via UV-vis spectrometer, and the results acquired from spectral studies are presented in Table . Complex synthesized from Cu shows a compelling absorption peak near 885 nm (11299 cm -1 ) in the visible range. One allowed transition related to 2T 2g ← 2E g is indicated by the single absorption band. Calculated crystal field splitting, (Δ) related to this transition 17 is found to be 135.28 kJ / mol. The small value of Δ implies a tetrahedral geometry owned by copper compound. For other complexes, absorption peaks within UV range near 205-210 nm and 280-290 nm is observed respectively. Such bands indicate the occurrence of ligand (omeprazole) within the complexes .