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The title Schiff base compound, C28H26N2O2, possesses both OH and NH tautomeric character in its mol­ecular structure. While the OH side of the compound is described as an inter­mediate state, its NH side adopts a predominantly zwitterionic form. The mol­ecular structure of the compound is stabilized by both N+—H...O and O—H...N intra­molecular hydrogen bonds. There are two weak C—H...O hydrogen bonds leading to polymeric chains of topology C(5) and C(13) running along the b axis of the unit cell. In addition, inter­molecular C—H...π inter­actions serve to stabilize the extended structure.

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Mol­ecules of the title compound, C24H19NO6S, adopt the Z configuration and have a distorted tetra­hedral geometry around the S atom. The oxazolone, 2-phenyl and methoxy­phenyl rings are approximately coplanar. The C atom between the methoxy­phenyl and oxazolone rings displays a distorted trigonal bonding geometry. Pairs of mol­ecules are linked into dimers through weak C—H...O hydrogen bonds.

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The title complex, [PdCl2(C21H26N2)(C18H15P)], shows slightly distorted square-planar coordination around the PdII metal centre. The Pd—C bond distance between the N-heterocyclic ligand and the metal atom is 2.028 (5) Å. The dihedral angle between the two trimethyl­phenyl ring planes is 36.9 (2)°.
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