Abstract
Bichelated neutral palladacycles (1–3), [Pd(L)Cl], were synthesized from reaction of the new potential tridentate (C,N,S) ligands, 2-thiobenzylazobenzene (L1), 4′-methyl-2-thiobenzylazobenzene (L2), and 4′-chloro-2-thiobenzylazobenzene (L3) with sodium tetrachloropalladate(II), Na2[PdCl4], in ethanol. The compounds were characterized by elemental analysis, FT-IR, 1H NMR, UV–visible, and thermogravimetric analysis. The crystal structures of L2 and 1–3 were determined by single-crystal X-ray diffraction. In 1–3, the geometry around palladium remains almost square planar, coordinated to carbon, nitrogen, and sulfur of the ligand forming a bichelated cyclopalladate complex. The C–H…Cl type intermolecular hydrogen bonds, weak π…π, C–H…π, and van der Waals interactions are believed to be the stabilizing forces for the crystal packing of these palladacycles.
Published Version
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