Fig. 6From: Density functional theory modeling of chromate adsorption onto ferrihydrite nanoparticlesCorrelations of calculated versus vibrational frequencies for bidentate binuclear models with the B3LYP, M06-2X and PBE0 exchange–correlation functionals and the 6-311+G(d,p) basis set. Correlation parameters listed in Additional file 1: Table S1Back to article page