PdII–PdII bonding interaction in dinuclear PdII complex with non-macrocyclic (O&N) chelates: Characterization, kinetics and DFT study

Highly phosphorescent organopalladium(ii) complexes with metal–metal-to-ligand charge-transfer excited states in fluid solutions

Making Pd(ii) brightly shining: mononuclear analogues are non-emissive, but folded dinuclear palladium(ii) diacetylide complexes phosphoresce from MMLCT excited states with quantum yields up to 48%.

Synthesis, spectral and luminescence study, crystal structure determination and DFT calculation of binuclear palladium(II) complexes

Binuclear palladium(II) complexes with metal-metal (d⁸-d⁸) bonding interaction were synthesized by reactions of the 1-methyl-1H-1,2,3,4-tetrazole-5-thiol (Hmtzt) or a mixture of Hmtzt and 1,3-propanediamine (1,3-pda) ligands. Complex [Pd₂(μ-mtzt)₄]·2CH₃CN (1) was synthesized by the reaction of Pd(OAc)₂ with Hmtzt dissolved in acetonitrile and complex [Pd₂(μ-mtzt)₂(mtzt)₂(1,3-pda)] (2) was synthesized by reaction of a mixture of Hmtzt and 1,3-propanediamine (dissolved in methanol) with PdCl₂ (dissolved in acetonitrile) and were identified through elemental analysis, IR, UV-Vis, ¹H NMR, luminescence spectroscopy as well as single-crystal X-ray diffraction method. A single-crystal of complex 1 shows that two Pd(II) centers are linked together by four bridging tetrazole ligands providing a paddle wheel-like arrangement. Also a crystal structure of complex 2 shows that this complex possesses a symmetric structure in which one Pd atom is tetra-coordinated by four sulfur atoms to forms PdS₄ and other Pd atom is tetra-coordinated by four nitrogen to forms PdN₄ coordination sphere. Density functional theory (DFT) was performed in this study for the Hmtzt ligand and binuclear palladium(II) complexes (1) and (2). The DFT calculation shows Pd^II-Pd^II bond lengths of 2.831 and 3.086Å in complex 1 and 2, respectively which are close to the observed bond lengths of 2.802(11) and 3.0911(17)Å from single-crystal X-ray structure. The optimized geometry of the complexes is shown good agreement by X-ray data. Structural properties and molecular descriptors including bond lengths, bond angles, chemical hardness, dipole moment, HOMO-LUMO energy levels, electron transfer were analyzed. The IR spectroscopy was performed using VEDA4 software and UV-Vis spectra were analyzed using time-dependent density functional theory (TD-DFT) method. The theoretical and experimental data were also compared with each other.

Palladium(ii) N-heterocyclic allenylidene complexes with extended intercationic Pd⋯Pd interactions and MMLCT phosphorescence

Pallas's shine: extended intercationic Pd⋯Pd contacts of 3.30 Å show distinct MMLCT transitions and low-energy emissions.

VP, Misini B, Das P, Dasgupta S, Linert W, Moi SC. Synthesis, biological evaluation, substitution behaviour and DFT study of Pd(ii) complexes incorporating benzimidazole derivative

Pd(ii) complexes with good DNA/BSA binding ability exhibit cytotoxicity comparable to cisplatin on different cancer cells along with reduced toxicity towards normal cells.

Palladium(ii)–palladium(ii) bonding in two open clamshell dinuclear complexes

In two Pd(ii) dimers with Pd–Pd distance ≤3.26 Å, the metal–metal bond order is found to be zero.