European Journal of Inorganic Chemistry最新文献

Metallo-β-lactamases (MβLs) are bacterial Zn²⁺ dependent enzymes that catalyze the hydrolysis inactivating β-lactam antibiotics. Understanding their mechanism is crucial for developing more potent antibiotics and for designing inhibitors of MβLs paving the way for more effective treatments. To this end, numerous Zn²⁺ complexes that mimic MβLs have been synthesized and studied, leading to the conclusion that often a hydroxyl group coordinated to Zn²⁺ is responsible for the hydrolysis of substrates. In parallel, research on MβLs has highlighted the importance of the coordination of the substrate to Zn²⁺ and the involvement of the reactive hydroxyl group or of a water molecule in hydrogen bonding to facilitate the hydrolysis. The development of more suitable biomimetic complexes of MβL, which replicate these enzymatic features, can become crucial for obtaining deeper and more accurate mechanistic insights.

The synthesis and anticancer evaluation of palladium(II) complexes bearing mannose-conjugated mesoionic carbenes and their triazolium precursors (triazolium palladates) is reported. Ligand precursors are easily obtained via copper-catalyzed azide–alkyne cycloaddition. Palladium allyl carbene complexes are prepared extending the weak base route protocol to triazolium salts by reacting the metal precursor and azolium salts with potassium carbonate as the base in acetonitrile and under mild conditions. Additionally, triazolium allyl palladates are isolated, which represent the first examples of triazolium palladate complexes described in the literature. In vitro tests on a panel of cancer cell lines (A2780, A2780cis, DLD-1) reveal better or comparable cytotoxicity to cisplatin. The majority of complexes exhibit low cytotoxicity (>100 μM) toward MRC-5 and FT-190 nontumoral cell lines demonstrating remarkable in vitro selectivity.

Flexible and luminescent Red-emissive films based on thermoplastic polyurethane (TPU) doped with different % wt of the europium complex Eu(TTA)₃bipy have been developed. A complete characterization was carried out by spectroscopic techniques, thermal analysis, AFM and SEM microscopy and X-ray diffraction; this allowed the interaction present in the materials to be understood. Interestingly, even with low concentrations, bright red emission with a QY close to 17% was achieved. Further details can be found in the Research Article by P. Fuentealba, Y. Gil and co-workers (DOI: 10.1002/ejic.202500018). The authors thank the Fondo Apoyo Pago de Publicaciones Científicas de la DI&DITT-FaCiQyF for financial support.

A series of organic crystalline solids is prepared by Lewis pairing the pyridyl derivatives of benzothienobenzothiophene (BTBT) and tris(pentafluorophenyl)borane (TPFB). The Lewis pair series shows structural variations in the arrangements of the BTBT moiety: 1D π-stacked columns covered by TPFB, slipped columns, and cofacial dimers. Quantum chemical calculations are performed to quantify the intermolecular electronic coupling and bandgaps, which reveal that the 1D columns are electronically fragmented at the dimer or tetramer level. In response to the degree of electronic aggregations, the Lewis pairs exhibit red-shifted fluorescence, reaching 5810 cm⁻¹ from the emission maximum of the non-substituted BTBT (397 nm) to that of one crystal form (516 nm). Scanning tunneling microscopy reveals that one Lewis pair is loosely gathered on the Ag(111) surface without any ordered arrangement of the adsorbates, differing from that in the solid phase. Furthermore, vibrational fingerprinting of the Lewis pair is achieved using tip-enhanced Raman scattering techniques at the single-molecule level, including the B–N and C–S stretching characteristics. These results provide insight into modulating the molecular arrangements of small-molecule semiconducting units to alter the emission properties, as well as fabricating molecular devices adsorbed on surfaces via post-modification.

It's a new chapter for the European Journal of Inorganic Chemistry! Newly appointed Editor-in-Chief Axel Straube thanks his predecessor, Preeti Vashi, reflects on the journal's history and activities, and presents his vision for EurJIC – to remain an attractive, fully society-owned journal for research on Inorganic and Organometallic Chemistry in all their flavors that gives back to the community.

Direct seawater electrolysis holds significant promise due to its economic viability and sustainability of resources. The presence of excessive Cl⁻ in seawater poses significant challenges, underscoring the necessity for electrocatalysts with superior catalytic efficiency and strong corrosion resistance. Herein, a Zn-doped NiFe layered double hydroxide nanosheet array supported on nickel foam (Zn-NiFe LDH@NF) is developed as an efficient electrocatalyst for seawater oxidation. The formation of Zn(OH)₄²⁻ in alkaline seawater plays a crucial role in excluding Cl⁻ and preventing ClO⁻ generation, thereby boosting the long-term stability of the catalyst. The Zn-NiFe LDH@NF catalyst achieves impressive performance, delivering a current density of 1 A cm⁻² at a low overpotential of 341 mV and demonstrating excellent durability over 1000 h. These findings demonstrate that the incorporation of Zn significantly enhances the oxygen evolution reaction performance and durability of NiFe LDH-based catalysts for seawater oxidation, offering valuable insights for the advancement of seawater electrolysis systems.

Synthesis of vanadium complexes of aminophenolate ligands is generally influenced by metal precursors used, and electronic and steric properties originating due to substituents present on the phenyl ring of ligands. These influences have resulted in the development of interesting vanadium-aminophenolate chemistry in +II to +V oxidation states. These complexes have also been frequently explored as catalysts for various organic transformations. This review examines the vanadium-aminophenolate complexes isolated under different reaction conditions and characterized in various oxidation states and arranges them according to the complexing functionality of ligands and oxidation states. Wherever applicable, influence of vanadium precursors and substituents on the phenyl ring of ligands has also been highlighted. An account of various catalytic applications reported by these complexes has also been the part of this review.

While thallium forms several clusters in alkali metal thallides, indium clusters in related alkali metal indides are very rare. Here the mixing of the heavy trielides indium and thallium to approximate icosahedral entities present in Na₄A₆Tr₁₃ (A = K, Rb, Cs; Tr = In, Tl) is reported. Experimental results prove that at least up to 76% indium can be introduced in this structure type. From the moment indium is provided, the central atom of the icosahedral unit changes from thallium to indium, while the vertices of the cluster are mixed occupied by both, thallium and indium. The bonding and energetics of the compounds are investigated with quantum chemical methods.

Uncontrollable hemorrhage is a major cause of mortality in accidents, trauma, and medical procedures, highlighting the need for effective hemostatic agents. Zeolites and similar materials are promising due to their adsorption properties and ability to concentrate coagulation factors. This study reports the synthesis of calcium-silicates from chicken eggshell waste using TEA.OH, TPA.OH, and TBA.OH as templates. TPA.OH and TBA.OH direct the formation of rhodesite, a fibrous calcium-silicate, while TEA.OH results in quartz. Materials synthesized with TPA.OH and TBA.OH have surface areas of 53.3–100.3 m² g⁻¹ and mesopores ranging from 5.7 to 27.7 nm with pore volumes of 0.018–0.11 cm³ g⁻¹. In vitro coagulation assays (PT, aPTT) revealed that CaZ-3 and CaZ-4 activate factors within the contact system. The recalcification assay shows a significant reduction in clotting time, indicating action via the intrinsic pathway. Thromboelastographic analysis confirms high hemostatic performance: the material prepared with TBA.OH shows a shorter clot formation time (R = 1.8 ± 0.5 min) and higher maximum clot strength (MA = 52.1 ± 1.3 mm) than QuikClot, demonstrating its potential as an effective, waste-derived hemostatic agent.

Fe-SAPO-34 catalysts exhibit excellent structural stability and redox properties but possess limited low-temperature activity and a narrow temperature window for selective catalytic reduction of NO_X. To address these limitations, a series of Ce-modified Fe-SAPO-34 catalysts with varying Ce/Fe molar ratios are synthesized via the impregnation method. Characterization (including Brunauer–Emmett–Teller, X-ray diffraction, X-ray photoelectron spectroscopy, Hydrogen temperature programmed reduction, Ammonia temperature programmed desorption) reveal that optimal Ce doping (Ce/Fe = 0.1) increases the Fe³⁺/Fe²⁺ ratio from 56.74 to 68.83% and the chemisorbed oxygen content from 73.88 to 80.23%. Ce modification improves the dispersion of Fe species, increases the specific surface area from 474.78 to 517.74 m⁻² g⁻¹, and enhances surface acidity, as indicated by an increase in total NH₃ desorption from 1.18 to 1.87 mmol g⁻¹. Consequently, the Ce–Fe/SAPO-34 catalyst with Ce/Fe molar ratio of 0.1 achieves 98.82% NO_X conversion at 360 °C and maintains over 98% conversion in the range of 330–440 °C, while lowering the activation temperature by 40 °C compared to Fe-SAPO-34.