The title compound, [PdCl2(C18H24N2)]·(CH3)2SO·H2O, the Pd(II) ion is in a distorted square-planar geometry. The Pd-N bond distances are 2.022 (2) and 2.027 (2) Å, the Pd-Cl bond distances are 2.2880 (7) and 2.2833 (7) Å, and the ligand bite angle is 80.07 (9)°. The dimethyl sulfoxide and water mol-ecules form linear chains along [100] by O-H⋯O and O-H⋯S hydrogen bonds, generating eight- and 12-membered rings. C-H⋯Cl inter-actions link the chains, forming a three-dimensional arrangement. In addition, the 4,4-di-tert-butyl-2,2'-bi-pyridine ligand exhibits π-π stacking inter-actions [centroid-centroid distances = 3.8741 (15) and 3.8353 (15) Å]. The DMSO solvent is disordered and was refined with an occupancy ratio of 0.866 (3):0.134 (3).
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