Interaction Of Pd Research Articles

Chiral Biaryl N-Heterocyclic Carbene-Palladium Catalysts with Anagostic C-H···Pd Interaction for Enantioselective Desymmetric C-N Cross-Coupling.

Novel chiral biaryl imidazo[1,5-a]pyridine carbene-palladium complexes (ImPy-Pd) featuring an anagostic C-H···Pd interaction and a C5-aryl substituent have been developed and successfully applied to the Pd-catalyzed enantioselective desymmetric C-N cross-coupling of malonamide derivatives, providing chiral 3,4-dihydroquinoline-2-ones with quaternary stereocenters in high yields (≤99%) and enantioselectivities (≤97:3 er). The chiral catalyst exerts stereocontrol by restricting the rotation of substituents around the metal center through anagostic interactions with sterically bulky substituents.

Activity of bimetallic PdIn/CeO2 catalysts tuned by thermal reduction for improving methanol synthesis via CO2 hydrogenation

AbstractSynergistic Pd–In2O3 catalysts are promising candidates for producing methanol via CO2 hydrogenation, and the metal phases in them can be tuned by thermal reduction treatment affecting the catalytic activity significantly. This work presents a comprehensive investigation to gain an insight into the effect of thermal reduction temperature on the variation and interaction of Pd and In2O3 phases supported on CeO2 (viz., PdIn/CeO2) and their correlations with CO2 hydrogenation toward methanol synthesis. The findings show that Pd/In‐rich PdIn alloys and In2O3 with relatively strong interaction are key phases (by reducing the PdIn/CeO2 at 300°C) for promoting methanol formation, leading to a high selectivity to methanol at 78.9% and space–time yield (STY) of 3.6 gCH3OH gPdIn−1 h−1. A further increase in reduction temperature (from 300 to 500°C) promoted the formation of homogenized PdIn intermetallic alloys with significantly poor ability for H2 dissociation and CO2 activation, and hence poor methanol yield.

Development of embedded-atom method (EAM) potential for Palladium–Barium alloy

ABSTRACT An embedded-atom method (EAM) potential for the Pd–Ba alloy system has been developed in order to forward computational research in this alloying system as there is no EAM potential available for this alloy system. The force-matching method has been implemented to develop the EAM potential first, and then, optimisation to converged density-functional theory (DFT) data sets has been done to generate the accurate and reliable potential for the Pd–Ba alloy system. Some physical, elastic and thermal properties of BaPd2 crystal have been calculated through molecular dynamics (MD) simulation using the developed EAM potential and then verified these properties with the help of DFT analysis in order to examine the performance of the potential. The presence of some even peaks of BaPd2 in virtual XRD spectra using MD simulation has been justified by DFT analysis. Slight deviations in melting points calculation at different compositions of the Pd–Ba alloy system have been observed. Higher Ba–Pd interaction using radial distribution characteristics and slower kinetics for inter-diffusion through diffusional characteristics study of BaPd2 have been reported using MD simulation with the developed EAM potential. In spite of some discrepancies due to deficiency in the potential, a closer agreement between MD and DFT analysis has been observed.

Silicon rib waveguide with palladium coated gold nanorods overlayer for hexane and N-methylaniline detection

The adsorption of hexane and N-methylaniline was investigated by on-chip vibrational spectroscopy. The interaction with the Pd surface significantly perturbs the vibrational modes of hexane. Near-infrared absorption spectroscopy on the waveguide detected a redshifted CH stretching vibration. We showed that while rapid evaporation of one component may occur, the modification facilitates the sensing for large molecules and mixtures of substances. Rib waveguides were modified with palladium to exhibit an enhanced electromagnetic field effect due to the electrostatic interaction of Pd and hydrogen, showing the drop in the amine overtone absorption of 7.6 dB and the overtone related to the bond of carbon to hydrogen of 6.8 dB. The absorption of hexane bonds in water is 5.5 dB. The obtained values are 100 times higher than those predicted by the electromagnetic simulator for pure rib waveguides. This may be explained by CH bonds in hexane that can be activated through a hydrogen bond-like interaction with metal substrates. This achievement holds promising potential for advancing hexane and N-Methylailine detection and analysis technologies, with implications for diverse applications in various industries, such as environmental monitoring, industrial processes, and safety measures.

Electroless Deposition of Palladium Nanoparticles on Graphdiyne Boosts Electrochemiluminescence.

Modulating the electronic structure of metal nanoparticles via metal-support interaction has attracted intense interest in the field of catalytic science. However, the roles of supporting substrates in regulating the catalytic properties of electrochemiluminescence (ECL) remain elusive. Here, we find that the use of graphdiyne (GDY) as the substrate for electroless deposition of Pd nanoparticles (Pd/GDY) produces the most pronounced anodic signal enhancement in luminol-dissolved oxygen (O2) ECL system as co-reactant accelerator over other carbon-based Pd composite nanomaterials. Pd/GDY exhibits electrocatalytic activity for the reduction of O2 through a four-electron pathway at approximately -0.059 V (vs Ag/AgCl) in neutral solution forming reactive oxygen species (ROS) as intermediates. The study shows that the interaction of Pd and GDY increases the amount and stability of ROS on the Pd/GDY electrode surface and promotes the reaction of ROS and luminol anion radical to generate excited luminol, which significantly boosts the luminol anodic ECL emission. Based on quenching of luminol ECL through the consumption of ROS by antioxidants, we develop a platform for the detection of intracellular antioxidants. This study provides an avenue for the development of efficient luminol ECL systems in neutral media and expands the biological application of ECL systems.

Influence of acid-base equilibrium on interactions of some monofunctional coumarin Pd(II) complexes with biologically relevant nucleophiles-comprehensive kinetic study.

This aimed to develop a comprehensive theoretical protocol for examining substitution reaction processes. The researchers used a theoretical quantum-mechanical protocol based on the QM-ORSA approach, which estimates the kinetic parameters of thermodynamically favourable reaction pathways. This theoretical protocol was validated by experimentally investigating substitution mechanisms in two previously synthesised Pd(II) complexes: chlorido-[(3-(1-(2-hydroxypropylamino)ethylidene)chroman-2,4-dione)]palladium(II) (C1) and chlorido-[(3-(1-(2-mercaptoethylamino)-ethylidene)-chroman-2,4dione)]palladium(II) (C2), along with biologically relevant nucleophiles, namely L-cysteine (l-Cys), L-methionine (l-Met), and guanosine-5'-monophosphate (5'-GMP). Reactions were investigated under pseudo-first-order conditions, monitoring nucleophile concentration and temperature changes using stopped-flow UV-vis spectrophotometry. All reactions were conducted under physiological conditions (pH = 7.2) at 37 °C. The reactivity of the studied nucleophiles follows the order: l-Cys > l-Met > 5'-GMP, and the reaction mechanism is associative based on the activation parameters. The experimental and theoretical data showed that C2 is more reactive than C1, confirming that the complexes' structural and electronic properties greatly affect their reactivity with selected nucleophiles. The study's findings have confirmed that the primary interaction occurs with the acid-base species L-Cys, mostly through the involvement of the partially negative sulfur atom (87.2%). On the other hand, C2 has a higher propensity for reacting with L-Cys-, primarily through the partially negative oxygen atom (92.6%). The implementation of this theoretical framework will significantly restrict the utilization of chemical substances, hence facilitating cost reduction and environmental protection.

Enhancing alkyne semi-hydrogenation through engineering metal-support interactions of Pd on oxides

Enhancing alkyne semi-hydrogenation through engineering metal-support interactions of Pd on oxides

Carbon-supported Pd/NiO-CoOx nanoparticles for highly selective and stable 1-nitroanthraquinone hydrogenation

1-aminoanthraquinone has numerous applications in chemical industry, for example, it is an important intermediate for producing anthraquinone dyes. In this work, Pd/NiO/C, Pd/CoOx/C, and Pd/NiO-CoOx/C (C-carbon black) are prepared by room-temperature hydrazine hydrate and replacement reduction methods. All as-prepared catalysts have been characterized by XRD, SEM, TEM, HRTEM, XPS, STEM-EDX elemental mapping and line-scanning et al., The Pd-related species are highly dispersed on the nickel, cobalt or nickel-cobalt oxide nanoparticles (NPs), the interaction of Pd–NiO (or CoOx, NiO-CoOx) is present. Pd/NiO-CoOx/C provides 99.2 % conversion of 1-nitroanthraquinone and 91.0 % selectivity to 1-aminoanthraquinone for 1-nitroanthraquinone hydrogenation under the following reaction conditions: H2 pressure-3.0 MPa, 60 °C, 4 h. The catalytic behaviors of Pd/NiO-CoOx/C for 1-nitroanthraquinone hydrogenation are much better than Pd/NiO/C and Pd/CoOx/C mainly due to the interaction of Pd–NiO-CoOx, synergy effect of Pd and NiO-CoOx, and high Pd dispersion.

Investigation on CT-DNA and Protein Interaction of New Pd(II) Complexes Involving Ceftazidime and 3-Amino-1,2,3-triazole: Synthesis, Characterization, Biological Impact, Anticancer Evaluation, and Molecular Docking Approaches.

Two new palladium (II) complexes, [Pd(CAZ)(OH2 )2 ]2+ (1) and [Pd(3-AT)(OH2 )2 ]2+ (2), (CAZ=ceftazidime, and 3-AT=amitrole) were synthesized and studied for their potential as anticancer drugs with low toxicity and high potency. To fully characterize these complexes, we conducted elemental analysis and FT-IR studies. Furthermore, we irradiated the complexes with Indian 60 Co gamma rays and thoroughly evaluated their antimicrobial properties. Our results demonstrate that the inhibitory activity of complexes was significantly enhanced against (G+) bacteria and fungi. Additionally, we probed the complexes' interaction with CT-DNA and BSA using various techniques, including UV-vis spectroscopy, thermal denaturation, viscometry, gel electrophoresis, and molecular docking studies. Our findings conclusively demonstrate that these complexes possess a strong binding interaction with CT-DNA via minor groove binding and/or electrostatic interactions, as well as excellent binding affinity to BSA. Finally, we conducted a cytotoxicity assay that clearly indicates these complexes hold immense promise as cell growth inhibitors against MCF-7 and HCT-116.

D-d Orbital coupling induced by crystal-phase engineering assists acetonitrile electroreduction to ethylamine

The d-d orbital coupling induced by crystal-phase engineering can effectively adjust the electronic structure of electrocatalysts, thus showing significant catalytic performance, while it has been rarely explored in electrochemical acetonitrile reduction reaction (ARR) to date. Herein, we successfully realize the structural transformation of PdCu metallic aerogels (MAs) from face-centered cubic (FCC) to body-centered cubic (BCC) through annealing treatment. Specifically, the BCC PdCu MAs exhibit excellent ARR performance with high ethylamine selectivity of 90.91%, Faradaic efficiency of 88.60%, yield rate of 316.0 mmol h−1 g−1Pd+Cu and long-term stability for consecutive electrolysis within 20 h at −0.55 V vs. reversible hydrogen electrode, outperforming than those of FCC PdCu MAs. Under the membrane electrode assembly system, BCC PdCu MAs also demonstrate excellent ethylamine yield rate of 389.5 mmol h−1 g−1Pd+Cu. Density functional theory calculation reveals that the d-d orbital coupling in BCC PdCu MAs results in an evident correlation effect for the interaction of Pd and Cu sites, which boosts up the Cu sites electronic activities to enhance ARR performance. Our work opens a new route to develop efficient ARR electrocatalysts from the perspective of crystalline structure transformation.

A Study of CeSnOx and Pd/CeSnOx as Low-Temperature NOx Adsorbers with Excellent Hydrothermal Stability.

In the present work, we report on two passive NOx adsorber (PNA) material candidates: the novel support CeSnOx with and without Pd loading. The NOx adsorption and storage capacities of fresh and hydrothermally aged CeSnOx and Pd/CeSnOx were investigated. The results show that CeSnOx exhibits a rather large NOx uptake and storage capacity (28.9 μmol/g), while the loading of Pd on CeSnOx can further increase the storage capacity to 37.6 μmol/g and affect the desorption temperature of NOx. It was found that the NOx desorption temperature of Pd/CeSnOx was compatible with the efficient operating window of selective catalytic reduction (SCR) catalysts. After a hydrothermal aging treatment at 800 °C for 12 h, the NOx adsorption and storage capacities of CeSnOx and Pd/CeSnOx increased, indicating excellent hydrothermal stability. The interaction of Pd with CeSnOx, the state of Pd species, and the structure of CeSnOx and Pd/CeSnOx are studied by combination of the characterization results.

Sitagliptin with Piperine Pharmacodynamic and Pharmacokinetic Studies in Normal and Diabetic Rabbits

Background: Food-drug interactions caused by dietary alkaloids like piperine may significantly impact medication metabolism and excretion. In this study, we studied piperine's effect on sitagliptin's PD and PK. Method: The research assessed the food-drug interaction in normal and diabetic rabbits to demonstrate how piperine affects the PD and PK of sitagliptin. Piperine, sitagliptin, and sitagliptin plus piperine treatment were administered to normal and diabetic rabbits. Blood samples were taken from the treated rabbits at predetermined intervals on days 1, 3, 7, and 21. Plasma was extracted from the obtained blood samples, and glucose levels were measured by the GOD-POD technique and insulin levels by ELISA. The extracted plasma samples collected on days 1 & 21 at predetermined intervals were exposed to HPLC analysis for estimation of PK parameters of sitagliptin. In both normal and diabetic rabbits, statistically comparisons were done between PK/PD of sitagliptin alone and in combination with piperine. Results: Piperine plus sitagliptin has no significant difference in glucose levels, percent blood glucose reductions, and insulin levels on 0, 1, 3, 7, 14 & 21st days in normal rabbits as compared with sitagliptin alone, and this may be because sitagliptin has no hypoglycemic effect. In diabetic rabbits, sitagliptin plus piperine significantly reduced blood glucose levels, raised the percent blood glucose reductions, and increased insulin levels on days 1, 3, 7, 14, and 21, compared with sitagliptin alone, demonstrating antihyperglycemic efficacy. Antihyperglycemic efficacy results indicate that sitagliptin with piperine has an additive effect on releasing more insulin, which is considered a PD interaction. In the PK study, sitagliptin plus piperine significantly raised the AUC0-∞, AUC0-t, AUMC0-∞, and AUMC0-t and lowered the CL of sitagliptin compared to sitagliptin alone on days 1 and 21 in normal and diabetic rabbits. Furthermore, the Tmax of sitagliptin did not change significantly, and the Ke, t1/2, and MRT varied non-significantly when piperine was administered concurrently. Additionally, Vd was also non-significantly altered in normal rabbits. This study's results suggest that piperine inhibits the CYP3A4 metabolic enzyme and P-gp (P-glycoprotein) substrate of sitagliptin in normal and diabetic rabbits, indicating a food-drug interaction. Conclusion: In normal rabbits, this study found no PD interaction. A PD interaction between piperine and sitagliptin showed the additive effect in diabetic rabbits by showing an antihyperglycemic activity. As per study findings, in normal and diabetic rabbits, piperine significantly increased the bioavailability of sitagliptin. However, the anticipated clinical response in humans cannot always be predicted from animal studies, so further research is required to evaluate drug interaction in humans.

Associations of Dental Health With the Progression of Hippocampal Atrophy in Community-Dwelling Individuals: The Ohasama Study.

Although tooth loss and periodontitis have been considered risk factors of Alzheimer disease, recent longitudinal researches have not found a significant association with hippocampal atrophy. Therefore, this study aimed to clarify a longitudinal association between the number of teeth present (NTP) and hippocampal atrophy dependent on the severity of periodontitis in a late middle-aged and older adult population. This study included community-dwelling individuals aged 55 years or older who had no cognitive decline and had undergone brain MRI and oral and systemic data collection twice at 4-year intervals. Hippocampal volumes were obtained from MRIs by automated region-of-interest analysis. The mean periodontal probing depth (PD) was used as a measure of periodontitis. Multiple regression analysis was performed with the annual symmetric percentage change (SPC) of the hippocampal volume as the dependent variable and including an interaction term between NTP and mean PD as the independent variable. The interaction details were examined using the Johnson-Neyman technique and simple slope analysis. The 3-way interaction of NTP, mean PD, and time on hippocampal volume was analyzed using a linear mixed-effects model, and the interaction of NTP and time was examined in subgroups divided by the median mean PD. In all models, dropout bias was adjusted by inverse probability weighting. Data of 172 participants were analyzed. The qualitative interaction between NTP and the mean PD was significant for the annual SPC in the left hippocampus. The regression coefficient of the NTP on the annual SPC in the left hippocampus was positive (B = 0.038, p = 0.026) at the low-level mean PD (mean -1 SD) and negative (B = -0.054, p = 0.001) at the high-level mean PD (mean +1 SD). Similar results were obtained in the linear mixed-effects model; the interaction of NTP and time was significant in the higher mean PD group. In a late middle-aged and older cohort, fewer teeth were associated with a faster rate of left hippocampal atrophy in patients with mild periodontitis, whereas having more teeth was associated with a faster rate of atrophy in those with severe periodontitis. The importance of keeping teeth healthy is suggested.

Selective hydrogenation of phenylacetylene over high-energy facets exposed nanotubular alumina supported palladium catalysts

High-energy facets exposed nanotubular alumina as well as conventional alumina supported Pd catalysts were synthesized and applied to the selective hydrogenation of phenylacetylene. Novel alumina supported catalyst presented higher selectivity at complete conversion of phenylacetylene. This could be related to the well dispersion of Pd and strong metal-support interaction, which are the consequences of the unique structural properties of the crystal plane regulated alumina. It helps create more active sites for hydrogenation meanwhile facilitates the desorption of alkene and thus suppresses the excess hydrogenation towards ethylbenzene.

Pd-functionalized 2D TMDC MoTe2 monolayer as an efficient glucose Sensor: A First-principles DFT study

The glucose concentration in human blood is an essential predictor for diagnosing and monitoring symptoms related to diabetes mellitus. In the current scenario of increasing diabetes patients daily, developing cost-effective glucose (GLU) sensors with excellent selectivity and sensitivity is relevant. The present study investigates the potential application of pristine and transition metal (TM = Sc, Pd, and Au) functionalized 2D transition metal dichalcogenide (TMDC) MoTe2 for glucose detection using first-principles Density Functional theory. The results demonstrate that the Pd and Sc functionalized systems are more highly sensitive towards the GLU than the pristine MoTe2, where the GLU adsorption is weak with an adsorption energy of −0.424 eV. The satisfactory adsorption energy (-0.8 eV), accelerated charge transfer and short recovery time (28 s) at 300 K revealed that Pd-functionalized MoTe2 could be a promising candidate for room-temperature GLU detection. The interaction of Pd on MoTe2 is due to charge transfer from Pd to MoTe2, whereas the adsorption of glucose on the Pd + MoTe2 system is facilitated through the charge transfer from the O 2p orbital of GLU to Pd. The first-principle Molecular dynamic simulations at 500 K validated the high-temperature structural stability of the MoTe2 + Pd-based GLU sensor. This research will give a solid theoretical foundation for the experimental fabrication of MoTe2-based glucometers.

Boosting Activity and Selectivity of UiO‐66 through Acidity/Alkalinity Functionalization in Dimethyl Carbonate Catalysis (Small 18/2023)

Pd-NO2-UiO-66 for DMC Catalysis In article number 2208238, Ye-Yan Qin, Yuan-Gen Yao, and co-workers first introduce acidity/alkalinity functionalized metal–organic frameworks (MOFs) into dimethyl carbonate (DMC) catalysis, and the Lewis acidic Pd-NO2-UiO-66 exhibits excellent catalytic behavior. In addition to affecting the interaction of Pd(II) and support, the -NO2 group has a dominant role in the chemisorption of methyl nitrite (MN) and CO for generating DMC.

Fast and Durable Dehydrogenation of Formic Acid over Pd–Cr(OH)3 Nanoclusters Immobilized on Amino-Modified Reduced Graphene Oxide

Formic acid, attractive as a renewable and safe liquid organic hydrogen carrier (LOHC), can be obtained by biomass conversion and CO2 hydrogenation with green hydrogen. The efficient and durable catalysts for formic acid dehydrogenation (FAD) are beneficial in the industry. Herein, Cr(OH)3-promoted Pd nanoclusters (NCs) (i.e., 1.6 nm) immobilized on amino-modified reduced graphene oxide (NH2-rGO) were successfully prepared through a simple wet-chemical approach. The obtained Pd–Cr(OH)3/NH2-rGO catalyst exhibits excellent catalytic activity and 100% hydrogen selectivity for CO-free FAD, giving a high turnover frequency of 2519.5 h–1 at 323 K, outperforming most reported Pd-based heterogeneous catalysts. Especially, the catalyst possesses robust durability toward FAD with no significant decline in activity and aggregation of metal NCs even after 10 cycles. The superior performance of the catalyst may be ascribed to the well-distributed Pd–Cr(OH)3 NCs, the strong electronic coupling of Pd with Cr(OH)3, the synergetic interaction of Pd–Cr(OH)3 with NH2-rGO, and the promotion effect of amino group. The reaction mechanism of FAD was explored based on the isotope experiments. This work provides insights into designing an effective and durable heterogeneous catalyst for dehydrogenation of LOHC.

Emerging co-synthesis of dimethyl oxalate and dimethyl carbonate using Pd/silicalite-1 catalyst with synergistic interactions of Pd and silanols

An emerging synthetic route for the co-synthesis of dimethyl oxalate (DMO) and dimethyl carbonate (DMC) via the indirect oxidative carbonylation of CH3OH is presented. The promising co-synthesis process combines the advantages of two separate routes of DMO and DMC syntheses. Herein, palladium containing silicalite-1 zeolite (Pd/S-1) catalyst was first found to be highly active and stable for the co-synthesis of DMO and DMC. The catalytic performance strongly depended on the catalyst activation, as the heat treatment could tune the silanols around the Pd species on the silicalite-1 zeolite. The Pd/S-1 catalyst with abundant silanols exhibited a higher turnover frequency (TOF) of 0.18 s−1 and a lower apparent activation energy of 51 kJ mol−1 in comparison to the catalyst with low silanol sites (0.06 s−1 and 101 kJ mol−1). The best performing catalyst had an average Pd nanoparticle size of 3.2 nm and Pd loading of 0.48 wt%. This catalyst showed a high CO conversion of 78% and DMO + DMC selectivity of 96%, maintaining high stability for at least 200 h. Furthermore, the synergistic interactions of silanols of silicalite-1 zeolite and Pd were confirmed by a series of in situ infrared experiments, and were found to be responsible for the enhanced activity. The silanols of S-1 zeolite played an essential role in forming the Pd active sites and had a very pronounced effect on the adsorption of CO reactant on the Pd species. Understanding the interactions between metal species and silanols of zeolite is critical for the development of high-performance zeolite catalysts.

High Efficiency Photocatalyst with Ultra‐Fine Pd NPs Constructed at Room Temperature for CO2 Reduction

AbstractThe photocatalytic CO2 converted into the value‐added products is regarded as a green strategy for the conversion and utilization of energy. Herein, we develop a commodious SEA (strong electrostatic adsorption) strategy to synthesize Pd‐based photocatalysts with ultra‐fine Pd NPs (Pd/TiO2−S−B). As verified by experiments and characterizations, the ultra‐fine Pd NPs can inexorably heighten the reaction activity of catalyst, because it can provide several functions consist of improving the carrier separation efficiency, light absorption and CO2 molecules adsorption. Meanwhile, the interaction of Pd and substrate can prevent the agglomeration of Pd NPs in reaction process. The designed Pd/TiO2−S−B contributes excellent performance in a gas‐solid system. The yields of CO (105.1 μmol/g‐cat) and CH4 (254.3 μmol/g‐cat) detected, are about 5.25 and 6.24‐fold higher than those of pristine TiO2. Pd/TiO2−S−B also exhibits the forceful stability with acceptable decline of catalytic activity after three cycles. This opens the door for the preparation of high‐performance and steady photocatalysts by reliable and effortless strategies toward CO2 reduction.

Overwintering Camelina and Canola/Rapeseed Show Promise for Improving Integrated Weed Management Approaches in the Upper Midwestern U.S.

Winter oilseed cash cover crops are gaining popularity in integrated weed management programs for suppressing weeds. A study was conducted at two field sites (Fargo, North Dakota, and Morris, Minnesota) to determine the freezing tolerance and weed-suppressing traits of winter canola/rapeseed (Brassica napus L.) and winter camelina [Camelina sativa (L.) Crantz] in the Upper Midwestern USA. The top 10 freezing tolerant accessions from a phenotyped population of winter canola/rapeseed were bulked and planted at both locations along with winter camelina (cv. Joelle) as a check. To phenotype our entire winter B. napus population (621 accessions) for freezing tolerance, seeds were also bulked and planted at both locations. All B. napus and camelina were no-till seeded at Fargo and Morris at two planting dates, late August (PD1) and mid-September (PD2) 2019. Data for winter survival of oilseed crops (plants m-2) and their corresponding weed suppression (plants m-2 and dry matter m-2) were collected on two sampling dates (SD) in May and June 2020. Crop and SD were significant (p < 0.05) for crop plant density at both locations, and PD in Fargo and crop x PD interaction in Morris were significant for weed dry matter. At Morris and Fargo, PD1 produced greater winter B. napus survival (28% and 5%, respectively) and PD2 produced higher camelina survival (79% and 72%, respectively). Based on coefficient of determination (r2), ~50% of weed density was explained by camelina density, whereas ≤20% was explained by B. napus density at both locations. Camelina from PD2 suppressed weed dry matter by >90% of fallow at both locations, whereas weed dry matter in B. napus was not significantly different from fallow at either PD. Genotyping of overwintering canola/rapeseed under field conditions identified nine accessions that survived at both locations, which also had excellent freezing tolerance under controlled conditions. These accessions are good candidates for improving freezing tolerance in commercial canola cultivars.