Figure 3. Structure of the complexes 1–3 in accordance with X-ray data and QTAIM analysis. In terms of the QTAIM formalism [46], all the coordination Cu–N and Cu–O bonds should be assigned to the intermediate type interactions that are characterized by positive values of the electron density Laplacian r2 and the negative electron energy density he(r) values. From one aspect, the positive r2 values indicate outflow of electron density from interatomic space into the
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