Identifying the influencing factors and, consequently, manipulating the magnetic anisotropy are crucial for enhancing the performance of single-molecule magnets (SMMs). Using the rigid tetradentate macrocyclic host ligand 1,4,7,10-tetrabenzyl-1,4,7,10-tetraazacyclododecane (L), a series of mononuclear six-coordinate Co(ii) complexes with trigonal prismatic geometry, including various bidentate coligands NO3-, CH3COO-, dhbq(2)- (H2dhbq = 2,5-dihydroxy-1,4-benzoquinone), and AHA- (HAHA = acetohydroxamic acid), were synthesized. The target complexes [CoL(NO3)](NO3) (1), [CoL(CH3COO)](PF6) (2), [CoL(dhbq)]& centerdot;2CH3OH & centerdot;H2O (3) and [CoL(AHA)](BPh4) (4) were characterized by X-ray diffraction, magnetic characterization, and first-principles calculation. Changing the coligands triggers significant alterations in the trigonal prismatic geometries, which allows systematic evaluation of the impacts of structural distortions. Direct current magnetic data revealed the large and negative axial zero-field splitting parameter, D, in all four complexes. Furthermore, theoretical calculations indicated that the trend in the absolute values of the D parameter follows the order of 1 > 2 > 3 > 4. Dynamic magnetic susceptibilities indicated that complexes 1-3 act as zero-field SMMs, while complex 4 shows a slow relaxation of magnetization under the external direct current field. These results indicated that the O-Co-O bite angle is the primary factor affecting magnetic anisotropy, while longer Co-O bond lengths lead to a weaker ligand field, thereby facilitating spin-orbital coupling to enhance the magnetic anisotropy.

Taking advantage of a bulky heptadentate organic ligand tris{[2-((imidazol-4-yl)methyl)amino]ethyl}amine (L) weakly binding to the central Dy(III) ion, two new eight-coordinate triangular dodecahedral Dy(III) complexes, [Dy(L)(F5PhO)2](BPh4)2'2CH3CN (F5PhOH = pentafluorophenol, 1) and [Dy(L)(2,6-dichloro-4-nitro-PhO)] (BPh4)2'CH3CN (2,6-dichloro-4-nitro-PhOH = 2,6-dichloro-4-nitrophenol, 2), were synthesized and characterized by X-ray diffraction, magnetic measurements, and theoretical calculations. Complexes 1 and 2 exhibit typical single-molecule magnet (SMM) behavior, with effective energy barriers of 69(6) K and 35(1) K, respectively. Detailed ab initio calculations were performed to further elaborate on the electronic and magnetic structures of the low-lying energy levels for both complexes. The theoretical results indicate that the presence of strongly electron-withdrawing substituents such as fluorine, chlorine, and nitro groups in the axial ligands leads to the reduction of the negative charge distribution in the axial ligand field, thus weakening the magnetic anisotropy of the oblate-shaped Dy(III) ion, which is also confirmed by the analysis of magneto-structural relationship.

Supersolid phases are quantum-entangled states of matter exhibiting the dual characteristics of superfluidity and solidity. Theory predicts that hard-core bosons on a triangular lattice can form such phases at half filling and near complete filling. Leveraging an exact mapping between bosons and spin- 1 2 degrees of freedom, here we show that these phases are realized in the triangular-lattice antiferromagnet K2Co(SeO3)2. At zero field, neutron diffraction reveals the development of quasi-two-dimensional 3 × 3 magnetic order with Z3 translational symmetry breaking (solidity), though with reduced amplitude indicating strong quantum fluctuations. These fluctuations manifest as equidistant bands of continuum neutron scattering, where the lowest-energy mode is gapless at K ( 1 3 1 3 ) , consistent with broken U(1) spin rotational symmetry (superfluidity). For c-axis-oriented magnetic fields near saturation, we find a second phase consistent with a high-field supersolid. These two supersolids are separated by a pronounced 1/3 magnetization plateau phase that supports coherent spin waves, from which we determine the underlying spin Hamiltonian.

The electrocatalytic reduction of nitrate (NO3ER) has emerged as a promising strategy for mitigating pollution in wastewater while concurrently producing value-added ammonia; however, its process is significantly hindered by the lack of highly efficient and low-cost electrocatalysts. Herein, we proposed several non-noble single-atom catalysts (SACs) anchored on graphitic carbon nitride (metal/g-C3N4, where M = Mn, Fe, Co, Ni, and Cu) as promising candidates for catalyzing NO3ER. Using comprehensive density functional theory (DFT) computations, we identified the Cu/g-C3N4 candidate as a highly efficient catalyst for the to NH3 conversion, exhibiting the lowest limiting potential (-0.64 V) among the catalysts examined, attributed to its optimal adsorption of the *NO3 intermediate. Furthermore, we fabricated the metal-N4 catalysts using a facile solution-based method. Consistent with our DFT results, the Cu/g-C3N4 exhibits excellent catalytic performance for NH3 production, achieving a remarkable Faradaic efficiency of 92.4% and an outstanding NH3 yield of 369.99 mmol g-1 h-1 at -0.6 V RHE, with excellent stability. Our work not only demonstrates a promising catalyst for NH3 synthesis but also provides fundamental guidance for the future development of efficient SAC-based electrocatalysts for nitrate reduction. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(NO3ER)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)NO3 -(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic): (sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(M/g-C3N4, (sic)(sic)M = Mn,Fe,Co,Ni(sic)Cu)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(SACs)(sic)(sic)(sic)(sic)NO3ER(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(DFT)(sic)(sic), (sic)(sic)(sic)(sic)(sic)Cu/g-C3N4(sic)(sic)(sic)(sic)(sic)(sic)NO3 -(sic)(sic)(sic)NH3(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(-0.64 V), (sic)(sic)(sic)(sic)(sic)(sic)*NO3(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)-N4(sic)(sic)(sic).(sic)(sic)(sic)(sic)DFT(sic)(sic)(sic)(sic), Cu/g-C3N4(sic)(sic)(sic)(sic)(sic)(sic)NH3(sic)(sic)(sic)(sic), (sic)-0.6 V RHE(sic)(sic)(sic)(sic)92.4%(sic)(sic)(sic)(sic)(sic)(sic)(sic)369.99 mmol g-1 h-1(sic)NH3(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)NH3(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SACs(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).

Aqueous zinc-ion batteries (AZIBs) represent a promising alternative to conventional energy storage systems due to their inherent safety profile, yet practical implementation remains impeded by dendritic zinc deposition and water-induced parasitic reactions. This work presents a rational interfacial engineering strategy through the integration of nicotinamide (NIC) into Zn(ClO4)2 electrolytes, achieving dual regulation of the electrolyte-electrode interface and Zn2+ solvation structure. The preferential NIC adsorption at the zinc anode establishes a H2O-depleted inner Helmholtz plane, forming an interfacial layer that governs Zn2+ diffusion kinetics and enables selective exposure of the energetically favorable Zn (002) crystallographic orientation. NIC's molecular architecture disrupts hydrogen-bonding networks in the bulk electrolyte, effectively suppressing hydrogen evolution reactions (HER) through electrochemical pathway modulation. These synergistic effects translate to remarkable electrochemical performance: symmetric Zn//Zn batteries exhibit 5000 h stability at 0.5 mA cm-2/0.5 mAh cm-2 and 210 h at 30 mA cm-2/30 mAh cm-2 (73.3% DOD), while Zn//Cu half-batteries demonstrate 99.55% Coulombic efficiency at 0.2 mA cm-2/0.2 mAh cm-2. Practical validation in NH4V4O10//Zn full batteries retains 417 mAh g-1 capacity after 1000 cycles at 500 mA g-1 with 88.94% capacity retention. We establish a molecular paradigm to suppress battery dendrites and side reactions via interfacial and solvation control.

Aqueous zinc-ion batteries (AZIBs) are currently confronted with the challenge of achieving long-term cyclic stability under high current densities. This issue is primarily attributed to the excessive growth of dendrites and the occurrence of significant side reactions. Herein, sucralose (SCL), as an electrolyte additive, has been used to promote the exposure of the Zn(002) texture. The introduction of SCL can adjust the Zn2+ nucleation and diffusion along different crystal facets, promoting the exposure of the Zn(002) texture. By substituting water molecules in the [Zn(H2O)6]2+, SCL reconfigures the hydrogen bond network in the electrolyte, reconstructing the solvation structure and suppressing the hydrogen evolution reaction. Consequently, the Zn//Zn symmetric battery exhibits long-term cycling stability of over 4900 h at 1 mA cm-2-1 mAh cm-2. Even at a harsh condition of 30 mA cm-2-30 mAh cm-2 (DOD = 73.3%), it can stably cycle for 171 h. The CE of the Zn//Cu half battery reaches 99.61% at 0.2 mA cm-2 with 0.2 mAh cm-2. Employing the optimized electrolyte, after 500 cycles, a high specific capacity of 420 mAh g-1 can be retained for the NH4V4O10//Zn full battery at 500 mA g-1, corresponding to a capacity retention of 90.7%.

Taking advantage of a new boron-bridged bicyclic crown ether ([EO5-B-EO5]-) as the hexagonal planar ligand, a novel dinuclear Dy(III) complex, namely [Dy2(EO5-B-EO5)(2,6-dichloro-4-nitro-PhO)4](BPh4) (1), was successfully isolated. Each Dy(III) center adopts a hexagonal bipyramidal coordination geometry, while the intramolecular Dy1 & centerdot;& centerdot;& centerdot;Dy2 distance is 6.2083(3) & Aring; in the Dy2 dimer. This complex shows typical slow magnetic relaxation behavior. Ab initio calculations revealed that the highly anisotropic ground states originate from the pseudolinear O-Dy-O ligand field, while the Ising axes of the two Dy ions are nearly perpendicular to each other, leading to weak antiferromagnetic interaction between the two Dy ions.

The electrocatalytic reduction of nitrate to ammonia (NO3RR) provides a sustainable pathway for wastewater remediation and NH3 production, yet its efficiency is hindered by sluggish kinetics caused by the weak adsorption of NO3 -on catalyst surfaces. Enhancing NO3 -adsorption is therefore crucial to improve catalytic activity. To address this challenge, dual active sites were engineered to enable synergistic adsorption and activation of NO3- , thereby accelerating reaction kinetics. Herein, single metal atoms were anchored into sulfur vacancies of FeS2 (M/FeS2) to construct atomically dispersed M-Fe dual sites. High-throughput density functional theory (DFT) screening of 22 M/FeS2 catalysts identified Mn/FeS2 as the most promising candidate with the lowest limiting potential (-0.33 V vs reversible hydrogen electrode, RHE) due to its optimal NO3 - adsorption strength. Experimental validation confirmed its outstanding performance, achieving a Faradaic efficiency of 92.61% and an NH3 yield rate of 115.85 mmol h- 1 gcat.-1 . Machine learning analysis revealed that charge transfer and inter-site distance act as key descriptors, accounting for over 86% of the variance in NO3 -adsorption energy. This integrated DFT-ML-experimental approach enables rapid discovery of efficient NO3RR catalysts and establishes a general descriptor framework for rational catalyst design.

Efficient, low-cost, and stable electrocatalysts are critical for sustainable hydrogen production. In this work, single transition metal (TM) atoms anchored on Stone-Wales defect graphene (SW-G) were investigated using density functional theory (DFT) calculations. SW defects provide stable anchoring sites, modulating the electronic structure and hydrogen adsorption behavior of graphene. Among the studied systems, V@SW-G, Mn@SW-G, Ni@SW-G, Cr@SW-G, and Rh@SW-G show Gibbs free energies of hydrogen adsorption (ΔGH*) near zero, indicating favorable HER activity. Electronic structure analysis reveals that strong metal-substrate interactions and defect-induced charge transfer weaken the direct correlation between the d-band center and ΔGH*, while the d-band center-Bader charge relationship highlights the role of electronic reconstruction. Kinetic analysis further shows that different TM@SW-G catalysts preferentially follow distinct HER pathways. This work provides mechanistic insights into defect-regulated single-atom catalysis and guides the rational design of high-performance graphene-based HER catalysts.

Two new polymorphs of (Ph4P)2[Co(N3)4] (1 and 2) were successfully synthesized via controlled temperature-mediated crystal growth. Polymorphs 1 and 2 crystallize in the monoclinic space group C2/c and triclinic space group P1, respectively, which are different from the two other reported polymorphs that are both in the monoclinic space group P21/n (3 and 4 with different lattice parameters). Analogous to polymorphs 3 and 4, polymorphs 1 and 2 exhibit a distorted tetrahedral coordination geometry around the Co center. Differences in the N-Co-N bond angles in the four polymorphs show a strong correlation with the deviation parameters from ideal T d geometry by SHAPE analyses, indicating that the N-Co-N bond angles (rather than Co-N bond lengths) are the main contributors to the distortions. Static magnetic and high-field EPR studies, supported by ab initio quantum chemical calculations, show that the sign of the axial zero-field splitting (ZFS) parameter (D) is positive for 1 (with rhombic magnetic anisotropy) but negative for 2 (with axial magnetic anisotropy). Furthermore, dynamic magnetic investigations confirm that both new polymorphs (1 and 2) exhibit field-induced slow magnetization relaxation, a behavior consistent with the previously reported analogues 3 and 4.

A decarboxylative oxidation and ring-opening protocol of carboxylic acids via tungsten-catalyzed photoinduced ligand-to-metal charge transfer (LMCT) is described. This reaction enables the preparation of carbonyl and 1, n-dicarbonyl compounds. To the best of our knowledge, this is the first example of tungsten catalyzed decarboxylative functionalization reactions.

Hydrogen peroxide (H2O2) production via the two-electron oxygen reduction reaction (2e- ORR) under ambient conditions offers a promising alternative to the industrial process, highlighting the need for stable and efficient catalysts. Inspired by the potential of integrative catalytic pairs (ICPs), we constructed a series of ICPs supported on nitrogenated holey graphene (C2N, a 2D holey carbon nitride framework with a C:N ratio of 2:1) by embedding metal and nonmetal atoms (ICPs/C2N). Among all candidates, Cu-B/C2N exhibited a record-low overpotential of 0.00 V, which originates from its unique electronic structure and exceptional stability, reflecting a strong synergistic effect between Cu and B in tuning OOH⁎ adsorption. Furthermore, machine learning based on the extreme gradient boosting regression model, combined with SHapley Additive exPlanations analysis, revealed that catalytic activity originates from the synergistic interplay between electronic modulation and geometric coordination at dual-metal sites. This work provides an efficient route to accelerate the discovery of high-performance ICP-based catalysts by combining theoretical calculations with machine learning insights.

With advances in energy storage technologies and a growing demand for flexible batteries, the development of high-performance 2D anode materials has become crucial for enhancing the performance of rechargeable batteries. Herein, the potential of metal chlorides MCl2 (M = Fe, Ni, and Zn) as anode materials for Li/Na ion batteries was investigated using density functional theory (DFT). The results showed that MCl2 monolayers exhibit robust kinetic stability, favorable thermodynamic adsorption of Li/Na ions, and a higher adsorption strength for Li compared to Na ions. Charge transfer analysis reveals that Li/Na ions donate electrons to the MCl2 monolayers, thereby altering their electronic structure. Band structure calculations show that, following Li/Na adsorption, FeCl2 and NiCl2 monolayers transition from semiconductors to metals, enhancing material conductivity and facilitating ion diffusion. Remarkably, the diffusion energy barriers for Li/Na ions in FeCl2 and NiCl2 are below 0.20 and 0.10 eV, respectively, thus ensuring the rapid Li/Na ion migration in the two materials. More importantly, further computations revealed that NiCl2 exhibits a high theoretical storage capacity (827.26 mAh g-1) and a low open-circuit voltage (Li/Na: 0.13/0.11 V), suggesting its great potential for application as an anode material. Our findings not only suggest a promising anode material, but also broaden the application potential of metal chlorides in energy storage.

A series of air-stable dinuclear complexes, [HNEt 3 ] 2 [Ln 2 (L) 2 ((CH 3 O) 2 PO 2 ) 4 ](BPh 4 ) 4 (L = 2,14-dimethyl3,6,10,13,19-pentaazabicyclo[13.3.1]nonadeca1(19), 2,13,15,17-pentene, Ln = Dy, 1-Dy; ; Tb, 2-Tb; ; Gd, 3Gd ), has been synthesized and characterized using single-crystal X-ray crystallography and magnetic measurements. The crystal structures disclose that two dimethyl phosphate anions act as bridging ligands, linking two Ln (III) ions. Each Ln(III) ion is eight-coordinated by five nitrogen atoms from a pentadentate Schiff based ligand L and three oxygen atoms from three dimethyl phosphates, forming a triangular dodecahedral coordination geometry. Direct-current magnetic susceptibility measurements indicate an extremely weak antiferromagnetic exchange between Gd(III) ions in 3-Gd. . Complex 1-Dy exhibits slow magnetic relaxation with an effective energy barrier (Ueff) U eff ) of 13 K under an applied field of 1000 Oe, whereas 2-Tb does not exhibit single-molecule magnet behavior. This work presents a novel strategy for constructing polynuclear single-molecular magnets by using a pentadetate macrocycle as magnetic building blocks integrated with replaceable axial ligands.

The encapsulation of metal Co nanoparticles in N-doped carbon was achieved through a facile hydrothermal and pyrolysis technique to isolate the nanocrystalline Co metal, thus preventing their mobilization and aggregation. The materials prepared at 400 degrees C were confirmed to be Co2C@NC; they were then converted into Co@NC and Co@NCNT at calcination temperatures of 500 degrees C and 600 degrees C, respectively. Co@NCNT presents stronger magnetic properties with 135.2 emu g(-1) saturation magnetization, 17.8 emu g(-1) remanence and 290.2 coercivity, as well as high catalytic activity for the advanced oxidation degradation of Rhodamine Blue with H2O2, providing a degradation rate of >99%. The contribution of the various lattice planes of the crystalline Co to saturation magnetization and the catalytic reactivity was explored. The active sites on the catalyst surface and the recovery and reusability of the catalyst were determined. Additionally, quenching experiments conducted by adding tert-butanol (TBA), 1,4-benzoquinone (p-BQ) and 2,2,6,6-tetramethylpiperidine (TEMP) to the reaction system were conducted, proving that the O-center dot(2)- radicals produced by the catalyst activating H2O2 play a key role in the oxidation degradation.

Two new heterometallic coordination polymers, [Dy(TPA)Fe(CN6)(H2O)2]center dot 4H2O (1-Dy) and [Gd2(TPA)2Fe2 (CN6)2(CH3OH)2]center dot 8.5H2O (2-Gd) were synthesized by reacting DyCl3 center dot 6H2O with K3[Fe(CN)6] and tri[(2-pyridyl) methyl]amine (TPA). The structures of both complexes were established by single crystal X-ray diffraction. Polymer 1-Dy exhibits a one-dimensional (1D) chain structure formed by [Fe(CN)6]3- bridging the [Dy(TPA) (H2O)2]3+ units. For polymer 2-Gd, each [Fe(CN)6]3- unit is connected to three [Gd(TPA)(CH3OH)]3+ units through three nearly coplanar CN groups, forming a near-rectangular grid Gd2Fe2. These Gd2Fe2 extend to generate a 2-dimensional (2D) monolayered topology, which represents a cyclic formation of a novel grid structure. Hydrogen bonding interactions via water molecules stabilize both structures. Magnetic susceptibility measurements indicate weak antiferromagnetic interactions between Ln(III) and Fe(III) ions, with Fe(III) and Ln (III) centers behaving as nearly isolated magnetic entities.

Indium-based bimetallic sulfides are one of the attractive anode materials for sodium-ion batteries (SIBs) but suffer from severe volume changes and sluggish kinetic process, resulting in fast capacity fading and inferior rate capability. While compounding with carbon is a common strategy, achieving mechanical robustness through rational hierarchical design and understanding the underlying stress dissipation mechanism remains a challenge. In this work, ultrathin FeIn2S4 nanosheets anchored on reduced graphene oxide (FIS@rGO) are rationally designed to create a stress-buffering architecture, and structural characterization confirms strong interfacial coupling between FIS and rGO. In situ XRD and finite element analysis collaboratively reveal that the remarkable stability originates from a highly reversible phase transition pathway and a unique stress-homogenizing effect within the hierarchical structure. Benefiting from the well-designed structure, FIS@rGO exhibits excellent sodium storage performance, achieving a high reversible capacity (503 mAh g-1 at 1 A g-1 over 200 cycles), superb rate capability (358 mAh g-1 at 15 A g-1), and durable stability (1300 cycles with 299 mAh g-1 at 10 A g-1). Furthermore, full cells paired with Na3V2(PO4)3F3 (NVPF) cathodes manifest outstanding cyclic stability with 92.4% capacity retention at 1 A g-1 after 100 cycles, demonstrating significant potential for practical applications.

This study demonstrated the capability of LC-DAD-SPE-NMR technique for verifying structures tentatively identified by LC-ESI-MS. Previous LC-ESI-MS analyses had characterized the major phenolic compounds in Chrysanthemum morifolium, yet the lack of complementary analytical tools left these assignments unconfirmed. Herein, the main compounds of this plant were unequivocally verified using LC-DAD-SPE-NMR, leading to the unambiguous identification of 19 compounds based on their NMR spectra. Among these, the structure of 4 flavonoid glycosides were corrected, and two novel compounds were reported for the first time. Structurally, caffeoylquinic acids were confirmed using 1H NMR only, while aglycone and glycosidic bond in flavonoid glycosides were verified by 1H NMR and 1H1H NOESY spectra. This work underscores the inherent limits of MS for structural elucidation and highlights the powerful structural elucidation and verification capability of LC-DAD-SPE-NMR for phenolic compounds. Furthermore, it establishes a robust analytical strategy for the structural verification of complex phytochemical mixtures.

Two pairs of isostructural mononuclear Ln(III) complexes sharing the same competent ligand tris{[2-{(imidazol-4-yl)methylidene}amino]ethyl}amine (H3L) and the alternative auxiliary ligands 8-hydroxyquinoline (H8-HQ) and salicylaldehyde (Hsal) were synthesized, namely, [Ln(H3L)(8-HQ)][BPh4]2 (Ln = Dy), 1; Eu, 3 and [Ln(H3L)(sal)][BPh4]2 (Ln = Dy, 2; Eu, 4). In all four complexes, the Ln(III) ions are nine-coordinated and exhibit an spherical-capped square antiprismatic coordination polyhedron. It is noteworthy that the neutral N-containing ligand H3L combining with the negatively charged 8-HQ-/sal- ligand affords a pseudo-mono-axial ligand field in all complexes. The Dy(III) derivatives 1 and 2 were found to exhibit slow magnetic relaxation behavior with U eff of 82(2) and 38.3(5) K, respectively. Ab initio calculations suggest that the distinctly different magnetic properties between 1 and 2 can be attributed to the change of one of the equatorial donor atoms from N to O. The luminescence properties of Eu(III)-based complexes 3 and 4 were investigated; these complexes show a brilliant emission of characteristic red light.