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The isosurfaces of RDG function (0.35 a.u.) colored according to the λ2 eigenvector (−0.02–0.04 a.u.) in the region of dihydroxypirimidine-2-one moiety of complexes A and B ((a) and (b), respectively). Negative values are blue-colored while positive ones are red-colored. The stacking interactions appear near point 1, while strong N-H…N and N-H…O bonds are close to points 2 and 3, respectively, (a) or 2, 3, 4 (b). The C-H…π interactions are visualized at points 4 (a) or 5, 6 (b).
