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. 2019 Nov 29;14:9309–9324. doi: 10.2147/IJN.S224805

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© 2019 Aouidat et al.

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(graph right) Interaction energy ΔE_int as a function of the Cl substitution around Au and Gd for the complex HAu(OH)_4-xCl_x and Gd(OH)_3-yCl_y. Energies in eV. The values on the x-axes correspond to the x values, while the numbers in the legend correspond to the y values. The ΔE_int for y = 1 is connected with a red line. (A) Geometry of the most stable HAu (OH)_4-xCl_x···Gd (OH)_3-yCl_y complex. (B) Geometry of the least stable HAu(OH)_4-xCl_x···Gd(OH)_3-yCl_y complex, showing a distorted trigonal geometry for Gd and a hydrogen bond between the Au and the Gd complex. The distance between both metal centers is 2.35 Å – 3.06 Å for structure a and b, respectively.