View of the structure of compound 1b (2 molecules) showing: a) the interactions of Au atoms and the H of a CH3 group from one mesityl ligand and an H from a pyridyl ring of the dppy ligand and b) One of the four C---H…π contacts in this molecule (two molecules of 1b, with complementary C15---H15…Cg3 contacts drawn as dashed lines. Symmetry codes (i): (-x, 1-y, 2-z); (ii): (x, −1+y, z); (iii): (−x, −y, 2-z)). Selected distances: Au(1)-C(1) 2.067(4); Au(1)-P(1) 2.295(1) Å. Selected angles: C(1)-Au(1)-P(1) 178.0(1); C(1)-Au(1)-C(2) 122.1 (3); C(1)-Au(1)-C(6) 119.5(3)°.