Palladium orthometallated complexes containing acetophenoneoxime: Synthesis, crystal structures and hirshfeld surface analysis

Mono‐ and dinuclear oxime palladacycles bearing diphosphine ligands: An unusual coordination mode for dppe

“…To our knowledge, five‐coordinate square pyramidal geometry in palladium complexes has been very scarcely reported. A search of the Cambridge Structural Database found 12 such complexes with a P 3 NC environment, all of which have the nitrogen atom in the apical position, in accordance with Bent's rule and the higher electronegativity of the nitrogen atom.…”

“…The chelating PdP distances of 2.295(6) and 2.337(6) Å lie in the range of 2.202–2.416 Å found for Pd complexes with chelating dppe ligands 25a, 28a. The average PdP bond length (2.33 Å) is slightly shorter than the sum of the covalent radii of Pd and P atoms (2.41 Å) and comparable to the analogous distances reported in other bridged biphosphinic palladacycles 25a, 28d,e. In addition, the PdC palladate bond length (2.06 Å) is shorter than the predicted value of 2.08 Å (based on the sum of the covalent radii for C (sp 2 ) and Pd, 0.771 and 1.31 Å, respectively)28e but lies in the range of 1.983(2)–2.068(3) Å obtained for related cyclopalladated complexes 28c,d, 29.…”

“…The CNOH and the metalate C4 carbon atoms are shifted to high frequencies in comparison with the free oxime ligand, which is in agreement with the chelating coordination mode of the oxime ligand via the iminic N and the C4 carbon atoms. Similar values have been reported for related Pd(II) complexes with oxime ligands …”

Ortho-palladated complexes with aromatic N-donor ligands, synthesis, characterization, molecular structures, antibacterial and anticancer activity

“…In this case, chlorido ligands in complexes ( 1), ( 7) and (8) participate in intramolecular and/or intermolecular N-H … Cl hydrogen bonds. The Pd-C1 bond distances in (1), ( 7) and (8) (1.984 (4)-1.991 (2)Å) are comparable to those reported in related cyclopalladated compounds [40,41]. 3.5.…”

“…A chlorido ligand transposed to the carbo-palladated C1 atom occupies the remaining coordination site. The Pd-Cl bond lengths (2.4053(5)-2.4327( 9) ) in all three compounds are similar and slightly longer than the maximum limit of the expected interval of Pd-Cl bond distances (2.37-2.45 Å) [40,41]. Such stretching of the Pd-Cl bond has already been observed in similar ortho-palladated complexes because of intramolecular hydrogen bonding.…”