DABCO Cadmium(II) Tetrakis(4-metoxyphenyl)porphyrin Complex – Structure, Photophysical properties, and Adsorpion removal of methylene blue dye

Abstract In this work, a new cadmium(II) complex namely the (1,4-diazabicyclo[2.2.2]octane)(meso-tetrakis(4-tert-methoxyphenyl)porphyrinato)cadmium(II) with the formula [Cd(TMPP)(DABCO)] (I) (DABCO = 1,4-diazabicyclo[2.2.2]octane) was successfully synthetized. The structure of (I) have been characterized by FT-IR, 1HNMR, UV-visible, fluorescence spectroscopies and single crystal X-ray diffraction technique. DFT calculations has been made for the structural, 1H NMR spectroscopy and IR spectra analysis. The adsorption of methylene blue (MB) dye was studied to examine the efficiently of the [Cd(TMPP)(DABCO)] for removing the cationic dyes from aqueous solution. The Langmuir adsorption capacity (Q0max) at 290 K and pH 7.0 was found to be 69.24 mg.g-1. The adsorption mechanism which involved π-π interaction between the MB dye molecule and the porphyrin ring of (I) is well described by the pseudo second-order and Elovich models.