Pd Se Research Articles

A Quick Joule‐Heating Coupled with Solid‐Phase Synthesis for Carbon‐Supported Pd–Se Nanoparticles Toward High‐Efficiency Electrocatalysis

AbstractWith respect to the potential of palladium (Pd)‐based nanomaterials in catalyzing typical electrochemical reactions, herein, a strategy that couples the quick Joule‐heating with a solid phase synthesis for producing carbon‐supported Pd–Se nanoparticles with welcome features is reported, e.g., fine sizes, clean surfaces, and controlled crystal phases toward electrocatalysis of oxygen reduction reaction (ORR) and ethanol oxidation reaction (EOR) in an alkaline medium. Principally, the introduction of Se into Pd alters its electronic properties and weakens the adsorption of key reaction intermediates on the Pd–Se nanoparticles during the ORR and EOR process, thus endowing them with better electrocatalysis for the same electrochemical reactions. Impressively, the carbon‐supported Pd–Se nanoparticles exhibit phase‐dependent electrocatalysis toward ORR and EOR. In particular, the cubic Pd17Se15 nanoparticles supported on carbon substrate show mass activity of 0.206 A mgPd−1 and specific activity of 0.546 mA cm−2 at 0.9 V for ORR in 0.1 m KOH electrolyte, while the orthorhombic PdSe2 nanoparticles show a mass activity of 3.79 A mgPd−1 for EOR, higher than that of their cubic counterpart and commercial Pd/C catalyst. The universality of this synthetic strategy in manufacturing carbon‐supported noble metal chalcogenide nanoparticles and highlighting its potential in designing highly efficient electrocatalysts are emphasized.

Evidence for intrinsic defects and nanopores as hotspots in 2D PdSe2 dendrites for plasmon-free SERS substrate with a high enhancement factor

Surface-enhanced Raman spectroscopy (SERS), a very powerful tool for the identification of molecular species, has relied mostly on noble metal-based substrates to obtain a high enhancement factor. In this work, we demonstrate that self-driven intrinsic defects in 2D palladium di-selenide (PdSe2) dendrites grown at low temperature (280 °C) act as hotspots for high SERS enhancement. We grow 2D dendritic PdSe2 with ample intrinsic defects to exploit it for SERS application. X-ray electron spectroscopy (XPS) analysis reveals 9.3% outer layer and 4.7% interior Se vacancies. A detailed examination of atomic-scale defects revealed Se vacancy (VSe) coupled with Se–Pd–Se vacancy (VSe-Pd-Se) in monolayer PdSe2, and an array of line defects (Se vacancies) and nanopores in bilayer PdSe2 dendrites. Interestingly, our studies reveal that Se vacancy-rich PdSe2 gives rise to line defects that act like hotspots for SERS enhancement. Remarkably, the vacancy-rich dendritic PdSe2 shows a SERS enhancement factor >105 and can detect RhB at a concentration down to 10−8 M. We speculate that the topological line defects and the edge construction in PdSe2 dendrites act as metallic wire or edge, which is partly responsible for the high enhancement in the SERS signal. The high SERS sensitivity is explained on the basis of multiple charge transfer processes combined with the predicted metal-like behavior of the defected 2D PdSe2. Our conclusions are fully supported by the density functional theory calculation of the electronic density of states of the defective bilayer (2L) PdSe2, which remarkably exhibits metallic character. Being a defect-enabled SERS substrate, dendritic 2D PdSe2 fills the gap between conventional plasmonic SERS substrate and plasmon-free SERS substrate.

Selective semi-hydrogenation of alkynes on palladium-selenium nanocrystals

The selective hydrogenation of alkyne plays a crucial role in chemical industry, yet great challenges still remain for suppressing the over-hydrogenation to alkane while maintaining high activity. Herein, we demonstrate that palladium–selenium intermetallic nanocrystals (Pd4.5Se NCs, Pd4Se NCs, Pd7Se2 NCs, and Pd7Se4 NCs) can enable the semi-hydrogenation of alkyne to alkene. In situ characterizations and theoretical simulations indicate that the geometric and electronic synergetic effects of Pd–Se NCs can facilitate the σ-π associative adsorption of CC bond in alkyne but suppress the over-hydrogenation of alkene. In particular, Pd4.5Se NCs exhibit high selectivity to the semi-hydrogenation of phenylacetylene (PA) to styrene (≥98.0 %) in the full conversion range, which has outperformed Pd NCs/C and commercial Lindlar catalyst. This work expands the mechanism understanding of Pd-based catalysts for selective hydrogenation, which may attract great interests of researchers in material science, chemistry, and catalysis.

Synthesis of unconventional Pd-Se nanoparticles for phase-dependent ethanol electrooxidation.

By tuning the amount of the Se precursors during the synthesis, orthorhombic PdSe2, cubic Pd17Se15, and monoclinic Pd7Se2 nanoparticles are synthesized, which show phase-dependent electrocatalysis for the ethanol oxidation reaction. This work advances the controllable synthesis of transition metal selenides and inspires their applications in electrocatalysis.

Comparison of 3D water selective excitation sequences versus conventional 2D fat suppressed sequences of MRI in evaluation of knee cartilage

Background: To determine any difference between the efficacy of water excitation sequence in comparison with fat suppression sequence in evaluating knee cartilage.Materials and Methods: This prospective study was conducted for a period of two years from January 2021 to June 2022 in Department of Radiodiagnosis, Mahatma Gandhi Medical College and Research Institute, Pondicherry. Results: In this prospective study carried out on 40 persons who came for MRI knee, the inter-observer agreement for cartilage visibility was same and found to be better in both the sequences.The inter-observer agreement for cartilage pathology was found to be same for MFC, LFC and MTP in both the sequences. However, the inter-observer agreement for cartilage pathology over Patella, Trochlea and LTP was found to be better in 3D water excitation sequence than 2D fat suppression sequence.Conclusion: We observe a significant improvement in the inter-observer agreement when evaluating knee cartilage using 3D-WATS sequences than using conventional 2D PD SE sequences.

Phase Engineering of Palladium Selenide Using Chalcogen Flux Control

Palladium selenides, relatively unexplored platinum group metal chalcogenides, have been attracting significant interest due to their versatility in different applications and their numerous stable phases with different crystal structures. Most vapor-based bottom-up growth approaches using furnaces have resulted in the layered PdSe2 phase due to the reactions occurring in a saturated chalcogen vapor environment, in which PdSe2 is the most stable phase. Here, we show that precise control over the Pd/Se stoichiometry can be achieved through tuning the chalcogen flux, both incoming and outgoing, resulting in control over the local Se concentration on the growth substrate. Increasing temperatures are used to increase the outgoing flux of Se, leading to a phase transition from PdSe2 to Pd17Se15. Increasing the incoming flux of Se, through high mass loading, is then used to tune the reaction back to the growth of the PdSe2 phase. Detailed material characterization is performed to prove the different crystal structures and show the ability to tailor the Pd/Se family across two stable phases, with one being layered (PdSe2) and the other being three-dimensional (3D) bulk (Pd17Se15). Finally, we demonstrate the lifecycle of phase tuning by transforming PdSe2 into Pd17Se15 and then back again, through control of temperature and Se mass loading. These results open pathways for exploring the solid-state properties of this family of Pd–Se materials in optoelectronics and catalysis, which have been limited to date for vapor-based furnace growth approaches on substrates.

Large bulk photovoltaic effect and second-harmonic generation in few-layer pentagonal semiconductors PdS2 and PdSe2

Recently, atomically thin PdSe2 semiconductors with rare pentagonal Se–Pd–Se monolayers were synthesized and were also found to possess superior properties such as ultrahigh air stability, tunable band gap and high carrier mobility, thus offering a new family of two-dimensional (2D) materials for exploration of 2D semiconductor physics and for applications in advanced opto-electronic and nonlinear photonic devices. In this work, we systematically study the nonlinear optical (NLO) responses [namely, bulk photovoltaic effect (BPVE), second-harmonic generation (SHG) and linear electric-optic (LEO) effect] of noncentrosymmetric bilayer (BL) and four-layer PdS2 and PdSe2 by applying the first-principles density functional theory with the generalized gradient approximation plus scissors-correction. First of all, we find that these few-layer PdX 2 (X = S and Se) exhibit prominent BPVE. In particular, the calculated shift current conductivity is in the order of 130 μA V−2, being very high compared to known BPVE materials. Similarly, their injection current susceptibilities are in the order of 100 × 108 A V−2 s−1, again being large. Secondly, the calculated SHG coefficients (χ (2)) of these materials are also large, being one order higher than that of the best-known few-layer group 6B transition metal dichalcogenides. For example, the maximum magnitude of χ (2) can reach 1.4 × 103 pm V−1 for BL PdSe2 at 1.9 eV and 1.2 × 103 pm V−1 at 3.1 eV for BL PdS2. Thirdly we find significant LEO coefficients for these structures in the low photon energy. All these indicate that 2D PdX 2 semiconductors will find promising NLO applications in light signal modulators, frequency converters, electro-optical switches and photovoltaic solar cells. Fourthly, we find that the large BPVE and SHG of the few-layer PdX 2 structures are due to strong intralayer directional covalent bonding and also 2D quantum confinement. Finally, we also discuss the prominent features of these NLO spectra of these materials in terms of their electronic structure and optical dielectric functions.

Electrodeposition of Pd–Se thin films

The presented research describes the electrochemical synthesis of Pd–Se thin films. The deposition process was accomplished in an aqueous chloride solution at a rotating disc electrode in the potential range from −0.4 to −0.6 V. The resulting coatings varied in both elemental and phase composition as well as surface morphology, depending on the potential. The difference is due to a change in the electrode reaction mechanism. A post-deposition heat treatment revealed the presence of Pd4Se in the coating deposited at −0.4 V and Pd17Se15 and Pd8Se in the other layers.

Phase-Controlled Synthesis of Pd-Se Nanocrystals for Phase-Dependent Oxygen Reduction Catalysis.

Searching for highly efficient oxygen reduction reaction (ORR) electrocatalysts for fuel cell technology, in which the crystal structure plays a powerful role in regulating the electrocatalysis, is urgent yet challenging. Herein, we have explored the active and stable Pd-Se alloy electrocatalysts with controlled phase toward alkaline ORR. The phase-controlled Pd-Se nanoparticles (NPs) show interesting phase-dependent electrocatalytic performance, in which the Pd17Se15 NPs/C exhibits much better ORR performance than its counterpart, Pd7Se4 NPs/C, and the commercial Pd/C and Pt/C. Based on the detailed analysis, Pd in Pd17Se15 possesses more Se atom coordination and a higher valence state, thus providing a stronger capacity for the absorption of oxygenated species. DFT further reveals more charge transfer from the Pd17Se15 surface to the *OOH intermediate, which is the reason for the activity enhancement.

The cellular immunotherapy of integrated photothermal anti-oxidation Pd–Se nanoparticles in inhibition of the macrophage inflammatory response in rheumatoid arthritis

Reducing the inflammatory response is a major goal in the therapy of rheumatoid arthritis (RA). Herein, we integrated palladium nanoparticles (Pd NPs) with selenium nanoparticles (Se NPs) and obtained a multiple nanosystem (Pd@Se-HA NPs) that could simultaneously scavenge hydroxyl radicals (⋅OH) and provide a photothermal effect. The Pd@Se-HA NPs were constructed by a simple self-assembly method in which Se NPs were electrostatically bonded to Pd NPs; hyaluronic acid (HA) was linked to the NPs by ester bonding to provide macrophage targeting ability. The experiments show that the combined therapy of eliminating ⋅OH with Se NPs and utilizing PTT with Pd NPs could effectively reduce the inflammatory response in macrophages more effectively than either individual NP treatment. In addition, the outer layer of HA could specifically target the CD44 receptor to enhance the accumulation of Pd@Se NPs at the lesion, further enhancing the therapeutic effect. After treatment for 15 days, the Pd@Se-HA NPs nearly eliminated the inflammatory response in the joints of mice in an induced RA model, and prevented joint damage and degradation.

Charge Transfer Doping of 2D PdSe2 Thin Film and Its Application in Fabrication of Heterostructures

AbstractPalladium diselenide (PdSe2) is an emerging 2D material with exotic optical and electrical properties and widely tunable layer dependent band gap in the infrared regime. The ability to further tune the electronic properties of PdSe2 via doping is of fundamental importance for a wide range of electronic and optoelectronic device applications. Here, surface charge transfer doping of chemical vapor deposition grown p‐type PdSe2 thin film using benzyl viologen (BV) molecules is reported. The electrical transport measurements of the PdSe2 device show an increase in resistance by ≈1700 percent from 2.1 MΩ for the pristine sample to 36.2 MΩ upon BV doping, revealing electrons are transferred from BV molecules to PdSe2 resulting in an n‐doping. Raman characterization shows a red‐shift and broadening of A3g characteristic peak for the doped sample, while X‐ray photoelectron spectroscopy shows a negative shift in Pd 3d and Se 3d binding energies confirming n‐doping by BV. Kelvin force probe microscopy measurements show a ≈0.3 eV decrease in work function for doped PdSe2, consistent with the n‐doping by BV molecules. A selective doping of PdSe2 channel is implemented for the fabrication of lateral heterojunction device which shows good current rectifying behavior with a rectification ratio of up to ≈55.

Giant Thickness-Tunable Bandgap and Robust Air Stability of 2D Palladium Diselenide.

Uncovering the thickness-dependent electronic property and environmental stability for 2D materials are crucial issues for promoting their applications in high-performance electronic and optoelectronic devices. Herein, the extrahigh air stability and giant tunable electronic bandgap of chemical vapor deposition (CVD)-derived few-layer PdSe2 on Au foils, by using scanning tunneling microscope/spectroscopy (STM/STS), are reported. The robust stability of 2D PdSe2 is uncovered by the observation of nearly defect/adsorption-free atomic lattices on long-time air-exposed samples. A one-to-one correspondence between the electronic bandgap (from ≈1.15 to ≈0 eV) and thickness of PdSe2 /Au (from bilayer to bulk) is established. It is also revealed that few-layer semiconducting PdSe2 flakes present zero-gap edges, induced by hybridization of Pd 4d and Se 4p orbitals. This work hereby provides straightforward evidence for the thickness-tunable electronic property and air stability of 2D semiconductors, thus shedding light on their applications in next-generation electronic devices.

Synthesis, characterization, CT‐DNA binding and docking studies of novel selenated ligands and their palladium complexes

A novel selenated Schiff base (S)‐L1Hhas been synthesized from (2S)‐1‐(benzylselanyl)‐3‐phenylpropan‐2‐amine which upon reduction formed a reduced Schiff base (S)‐L2H. Palladium (II) complexes (S)‐1and (S)‐2of ligands (S)‐L1Hand (S)‐L2Hrespectively were successfully synthesized. The structures of all four compounds were thoroughly identified by analytical and various spectroscopic techniques. The absolute molecular structures of the above two complexes were further confirmed by single crystal X‐ray diffraction. Both (S)‐L1Hand (S)‐L2Hcoordinated as monobasic ((S)‐L1–2), chelating, tridentate (Se,N,O−) ligands resulting in the complexes of composition (S)‐[PdCl(L1/2)] [(S)‐1/2]. In the crystals of complexes (S)‐1and (S)‐2, there were moderate to strong Se⋯O, CH⋯Cl and CH⋯O types of intermolecular secondary interactions. CT‐DNA binding activity of these selenium‐containing ligands and their palladium complexes bearing a Pd–Se bond have been evaluated for the first time by performing electronic absorption titration and fluorescence emission quenching using CT‐DNA‐EB and viscometric experiments. These ligands and complexes exhibited remarkable DNA binding activity as shown by their intrinsic DNA binding constants (Kb) and Stern–Volmer constants (Ksv) in the ranges 5.2–9.9 × 104and 3.6–4.7 × 104, respectively. The viscosity of CT‐DNA decreases with increasing concentration of these compounds. The results of the DNA‐binding studies revealed that all of the compounds interact with DNA at a minor groove which was further confirmed by molecular docking studies.

Crystal structure of a palladium(II) complex containing the wide bite-angle bis-(selenium) ligand, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)

A palladium(II) complex {systematic name: dichlorido[1,3-di-tert-butyl-2,4-bis(tert-butylamino)-1,3,2λ5,4λ5-diazadiphosphetidine-2,4-diselone-κ2Se,Se']pal-ladium(II)}, cis-[PdCl2{I}], (II), containing a bis-(selenium) ligand based on cyclo-diphosph(V)azane, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)], (I), has been synthesized and structurally characterized. The crystal structure of complex II reveals that the ligand chelates through selenium donors with the natural bite-angle of 110.54 (1)° and a Pd-Se bond distance of 2.444 (1) Å. The coordination around PdII shows a slightly distorted square-planar geometry, as indicated by the angle between the [PdCl2] and [PdSe2] planes of 5.92 (3)°. In the crystal, the mol-ecules are inter-linked through weak N-H⋯Cl and C-H⋯Cl hydrogen-bonding inter-actions.

Exploratory studies of the Cu–Pd–Se system at 650°C, 550°C, 400°C, and 300°C

The condensed-phase system Cu–Pd–Se was investigated by means of dry syntheses from elements in evacuated silica glass tubes at 650 °C, 550 °C, 400 °C, and 300 °C. Synthetized phases were analysed by electron microprobe and textural studies in polished sections. At 650 °C an extensive selenide liquid field covers central portions of the system, coexisting with a limited choice of Pd selenides, Cu 2– x Se, alloys, and a (Cu,Pd)Se 2 solid solution. The selenide melt recedes to the Pd side of the system at 550 °C and its remnants persist at 400 °C. At the lower temperature, the gamut of Pd selenides becomes richer, and especially Pd 4 Se and Pd 17 Se 15 display significant solubility of Cu. The composition range of (Cu,Pd)Se 2 broadens and moves towards Cu-richer compositions as temperature decreases; CuSe and CuSe 2 appear at 300 °C. The synthetic analogue of jagueite, Cu 2 Pd 3 Se 4 , is present at 400 °C and 300 °C, at Se concentrations above the Cu 2– x Se–Pd 17 Se 15 line. At all examined temperatures, the individualized CuPd alloy dissolves Se, up to ∼5 at% at low temperatures.

MR morphology of triangular fibrocartilage complex: correlation with quantitative MR and biomechanical properties

To evaluate pathology of the triangular fibrocartilage complex (TFCC) using high-resolution morphologic magnetic resonance (MR) imaging, and compare with quantitative MR and biomechanical properties. Five cadaveric wrists (22-70 years) were imaged at 3 T using morphologic (proton density weighted spin echo, PD FS, and 3D spoiled gradient echo, 3D SPGR) and quantitative MR sequences to determine T2 and T1rho properties. In eight geographic regions, morphology of TFC disc and laminae were evaluated for pathology and quantitative MR values. Samples were disarticulated and biomechanical indentation testing was performed on the distal surface of the TFC disc. On morphologic PD SE images, TFC disc pathology included degeneration and tears, while that of the laminae included degeneration, degeneration with superimposed tear, mucinous transformation, and globular calcification. Punctate calcifications were highly visible on 3D SPGR images and found only in pathologic regions. Disc pathology occurred more frequently in proximal regions of the disc than distal regions. Quantitative MR values were lowest in normal samples, and generally higher in pathologic regions. Biomechanical testing demonstrated an inverse relationship, with indentation modulus being high in normal regions with low MR values. The laminae studied were mostly pathologic, and additional normal samples are needed to discern quantitative changes. These results show technical feasibility of morphologic MR, quantitative MR, and biomechanical techniques to characterize pathology of the TFCC. Quantitative MRI may be a suitable surrogate marker of soft tissue mechanical properties, and a useful adjunct to conventional morphologic MR techniques.

Pyrazole‐Stabilized Dinuclear Palladium(II) Chalcogenolates Formed by Oxidative Addition of Bis[2‐(4‐bromopyrazol‐1‐yl)ethyl] Dichalcogenides to Palladium(II) – Tailoring of Pd–S/Se Nanoparticles

AbstractBis[2‐(4‐bromopyrazol‐1‐yl)ethyl] disulfide and diselenide L1 and L2 were synthesized by the reactions of 4‐bromo‐1‐(2‐chloroethyl)‐1H‐pyrazole with the in situ generated Na2S2 and Na2Se2. The reactions of L1 and L2 with 2 equiv. of [PdCl2(CH3CN)2] in CH3CN at 70 °C proceed through an oxidative addition/reductive elimination sequence to the PdII center to form the chalcogenolato‐bridged dinuclear palladium(II) complexes [Pd2Cl2(μ‐EN)2] [1 (E = S) and 2 (E = Se); EN = 2‐(4‐bromopyrazol‐1‐yl)ethanechalcogenolate]. The reactions of 1 and 2 with CH3CN and AgBF4 resulted in the formation of [Pd2(CH3CN)2(μ‐EN)2]·2BF4 (3 and 4). Compounds L1, L2, and their complexes 1–4 have been characterized through 1H, 13C{1H}, and 77Se{1H} nuclear magnetic resonance (NMR) spectroscopy; infrared (IR) spectroscopy; and high‐resolution mass spectrometry (HRMS). The single‐crystal X‐ray structures of 2–4 have revealed distorted square‐planar geometries around the Pd center in each case. The Pd–S and Pd–Se bond lengths are in the ranges 2.277(2)–2.296(2) and 2.372(9)–2.3971(17) Å, respectively. Single‐source precursor routes for the synthesis of palladium chalcogenide nanoparticles (NPs) have been developed by the thermolyses of 1–4 in 1:1 mixtures of oleic acid (OA) and 1‐octadecene (ODE). Pd17Se15 NPs were formed from both PdII selenolates 2 and 4, whereas Pd4S NPs and a mixture of Pd16S7 (ca. 68 %) and PdS (ca. 32 %) NPs were obtained from PdII thiolates 1 and 3, respectively. Transmission electron microscopy (TEM), scanning electron microscopy with energy‐dispersive X‐ray spectroscopy (SEM‐EDX), and powder X‐ray diffraction (PXRD) have been used to authenticate the NPs. X‐ray photoelectron spectroscopy (XPS) studies on the NPs have revealed that there is a charge transfer from Pd to S/Se. The compositions of the NPs determined from XPS are consistent with the PXRD results.

Transparent counter electrode from palladium selenide for bifacial dye-sensitized solar cell

Aiming at reducing fabrication cost without sacrificing power conversion efficiency (PCE) of dye-sensitized solar cell (DSSC), transparent palladium selenide (Pd–Se) alloys are prepared by a cyclic voltammetric electrodeposition and utilized as counter electrodes (CEs) in bifacial DSSCs. The electrocatalytic activities of Pd–Se alloy CEs with adjustable stoichiometries are investigated, yielding an optimized alloy electrode at Pd7Se4. The PCE of the bifacial DSSC based on Pd7Se4 alloy CE shows front and rear efficiencies of 6.70% and 2.38% in comparison with 6.43% and 0.01% from pyrolytic platinum based solar cell, respectively. The results demonstrate that the Pd7Se4 alloy CE can serve as a good candidate for CE in DSSCs application.

Palladium(ii) complexes bearing the 1,2,3-triazole based organosulfur/ selenium ligand: synthesis, structure and applications in Heck and Suzuki–Miyaura coupling as a catalyst via palladium nanoparticles

Air and moisture insensitive palladium complexes, [Pd(L)Cl2] (1/2), in which L = 1-benzyl-4-phenylthiomethyl or 1-benzyl-4-phenylselenomethyl-1H-1,2,3-triazole (L1 or L2) catalyze Heck (HC) and Suzuki–Miyaura coupling (SMC) reactions between a series of aryl bromides including deactivated bromides and n-butyl acrylate and phenylboronic acid, respectively. The optimal catalytic loading was found to be in the order of 0.01 mol%. HRTEM, TGA and EDX data indicated that 3–11 nm nanoparticles (NPs) composed of palladium and sulfur or selenium and protected with L or its fragment, were formed during the catalyzed reaction. The isolated NPs displayed catalytic activity and appeared to have a role in the catalysis. A two-phase test indicated that both homogeneous and heterogeneous catalysis took place. The complexes 1 and 2 were synthesized by the reactions of L1 and L2 respectively with [(MeCN)2PdCl2]. Their single crystal X-ray diffraction indicated that the geometry adopted by ligands around Pd in both complexes is distorted square planar with Pd–S and Pd–Se bond lengths of 2.2727(14) and 2.3693(8) Å, respectively. DFT calculation gave bond lengths and angles in keeping with the experimental values. The DFT calculated HOMO–LUMO energy difference is lower for 1 than for 2 in accordance with the observed higher catalytic activity of 1.

Crystal structure of bis-{μ-2-[(di-methyl-amino)-meth-yl]ferrocene-seleno-lato}bis[chlorido-palladium(II)

The dinuclear title compound, [PdCl{Se[(C5H5)Fe(C5H3)2CH2N(CH3)2]}]2 was obtained by the reaction of [PdCl2(NCPh)2] with 2-[(N,N′-di­methyl­amino)­meth­yl]ferro­cene­seleno­late and the crystals for the structure determination were grown from a mixture of THF and n-hexane. Both PdII atoms are coordinated by the bridging Se atoms and by the amino N atoms of the bidentate 2-[(N,N′-di­methyl­amino)­meth­yl]ferrocene­seleno­late ligand, as well as by Cl atoms, and show a distorted square-planar coordination. The angle between the Pd—Se—Se planes of the two Pd atoms is 149.31 (3)°. Weak Cl⋯H hydrogen bonds link the binuclear complexes into a three-dimensional network.