Single-crystal X-ray Diffraction Research Articles

Assembling the Puzzle of Coparsite Polymorphism: Synthesis, Thermal Expansion, and Quantum Magnetism of α- and β-Cu4O2(VO4)Cl.

Two new dimorphic spin-1/2 quantum magnets, α- and β-Cu4O2(VO4)Cl, were synthesized via a chemical vapor transport method that emulates mineral formation in volcanic fumaroles. α-Cu4O2(VO4)Cl (1) is a pure vanadate analogue of the coparsite mineral characterized by [O2Cu4]4+ 1D single rods, whereas β-Cu4O2(VO4)Cl (2) adopts a new structure type with the [O2Cu4]4+ 2D layered topology. The thermal expansions of both 1 and 2 studied by high-temperature single-crystal X-ray diffraction are reported. Using ab initio calculations, we infer the presence of antiferromagnetic Cu1-Cu3 units with strong couplings on the order of 200-400 K forming chains (1) and layers (2). The Cu2 atoms are weakly coupled to such units. Magnetic susceptibility measurements corroborate this scenario by showing deviations from the paramagnetic behavior even at 300 K. Moreover, 1 reveals an antiferromagnetic ordering below TN = 24 K with a weak uncompensated magnetic moment.

Bridging 1,2-Bis(diphenylphosphino)methane Ligands Facilitate the Formation of Binuclear Complexes with Both Two-Coordinate and Three-Coordinate Gold(I) Ions.

Five new crystalline gold(I) complexes β-Au2(μ-dppm)2Br2·2CH2Cl2 (1), [Au2(μ- dppm)2Br]Br·2CH2Cl2 (2), [Au2(μ-dppm)2Br](PF6) (3), [Au2(μ-dppm)2Cl](BPh4)·3CH2Cl2 (4) and [Au2(μ-dppm)2]Cl(AsF6)·2CH2Cl2 (5) (where dppm is bis(diphenylphosphino)methane) have been prepared and structurally characterized by single crystal X-ray diffraction. Colorless β-Au2(μ-dppm)2Br2·2CH2Cl2 (1) has centrosymmetric structure with two three-coordinate gold(I) ions held in close proximity by the dppm ligands. Crystals of [Au2(μ- dppm)2Br]Br·2CH2Cl2 (2), [Au2(μ-dppm)2Br](PF6) (3), and [Au2(μ-dppm)2Cl](BPh4)·3CH2Cl2 (4) have a cation with an unusual arrangement that binds a two-coordinate gold(I) ion to a three-coordinate gold(I) ion through an aurophilic interaction. Whereas Au2(μ-dppm)2Cl(BPh4)·3CH2Cl2 (4) has a chloride ion bound to only one of the gold ions in the complex, [Au2(μ-dppm)2]Cl(AsF6)·2CH2Cl2 (5) has an ion paired chloride ion that is symmetrically disposed between the two gold ions at a rather long distance. Each complex displays luminescence under UV irradiation.

Tuning of a Hydrogen-Bonded Organic Framework by Liquid-Assisted Mechanosynthesis between Trans-Aconitic Acid and Isonicotinamide.

Cocrystallization of trans-aconitic acid (TACA) and isonicotinamide (INA) using liquid assisted mechanochemical grinding results in a unique supramolecular hydrogen-bonded organic framework (HOF) system encapsulating various organic solvents (liquid guest) with the formation of channel inclusion compounds. Dimension and shape of the framework is dependent on the solvent used during liquid assisted grinding (LAG). Although crystal structure of the cocrystal (TACA) ⋅ (INA)2 ⋅ (H2O)@(INA)0.5 has been determined by Single Crystal X-ray diffraction (SCXRD), crystal structures of 3 cocrystal HOFs were determined by microcrystal electron diffraction (MicroED) and synchrotron X-ray diffraction due to lack of suitable single crystal. PXRD analysis confirms isostructurality of various host-guest systems; whereas guest incorporation as well as stability of the HOFs were further confirmed using thermogravimetric analysis. This study demonstrates that the framework of HOFs can be tuned by varying solvent molecules used during LAG.

Synthesis and Structure of Porphyrin(2.1.2.1) Bows.

A new series of porphyrin(2.1.2.1) arches have been successfully synthesized by using porphyrin(2.1.2.1) as natural "arch limbs" for the construction of the arches. X-ray single-crystal diffraction revealed that the porphyrin(2.1.2.1) derivatives have a beautiful bow-shaped structure. The strong, rigid structure of the porphyrin(2.1.2.1) bow prevents hydrogenation with the Lindlar catalyst. The heterogeneous electrocatalytic HER activity of the porphyrin(2.1.2.1) bow indicated that the "bowstring" butadiyne-bridge reduced the HER capacity.

Ni(II) and Cu(II) Ion Coordination by the Novel (2E,2′E)-N,N′-(2-Hydroxypropane-1,3-diyl)bis[(2-hydroxyimino)propanamide] Ligand in the Solid State and in Aqueous Medium

In the process of a systematic study of the bis-chelate oxime-amide ligands with different polymethylene spacers and their transition metal complexes, two new Ni(II) and Cu(II) complexes of the mhiea2poh ligand have been isolated, and their molecular and crystal structures determined by single crystal X-ray diffraction. Potentiometric titrations were performed on a range of aqueous solutions in both systems, which allowed the identification of various complex species and afforded their stability constants. ESR spectra of samples with optimised concentrations of complexes in Cu(II)–L–H system were recorded. A distinguishing feature of both systems is the dimerization of anionic pseudo-macrocyclic complexes. The latter is caused either by centrosymmetric hydrogen bonding of the hydroxy group on the propane spacer to the oximato oxygen of the opposing unit or by back-to-back π-stacking of planar complex units. ESR measurements indicated likely coupling of Cu-Cu paramagnetic centres in the dimers.

Fluoromethyl Triflate and Fluoromethyl Fluorosulfonate: Easily Accessible and Powerful Fluoromethylation Reagents.

Fluoromethyl triflate (superfluoromethyl, SFM, FCH2OSO2CF3) and fluoromethyl fluorosulfonate (magic fluoromethyl, MFM, FCH2OSO2F) are two easily synthesized, highly effective and non-ozone depleting fluoromethylation reagents. They are analogous to the well-known and widely used methylation re-agents CH3OSO2CF3 and CH3OSO2F. Both SFM and MFM have been fully characterized by multinuclear NMR spectroscopy (1H, 13C, 17O, 19F, 33S). Their structures have been determined in the solid state on in situ grown crystals by X-ray diff-raction and in the gas phase by electron diffraction. The fluoromethylation efficiency of SFM and MFM was shown by reaction with chalcogen nucleophiles of differing nucleophilicity. All fluoromethylated products were isolated as pure com-pounds and charac-terized by NMR and vibrational spec-troscopy, as well as in some cases by single crystal X-ray diffraction.

Apoptosis-Inducing Activity of a 2-Hydroxyphenyl Benzamide-Based Self-Assembled Anion Channel.

Despite the significant interest in designing artificial ion channels, there is limited availability of channel-forming molecules to tackle complex issues, especially in biological systems. Moreover, a major challenge is the scarcity of chloride transporters that can selectively induce toxicity in cancer cells while minimizing harm to normal healthy cells. This work reports a series of 2-hydroxyphenyl benzamide-based small molecules 1 a-1 c, which self-assemble to form barrel rosette-type artificial ion channels that adequately transport chloride ions across membranes. The formation of these ion channels primarily relies on intermolecular hydrogen bonding and π-π stacking interactions, as supported by the analysis of single-crystal X-ray diffraction and molecular dynamics (MD) simulations. Importantly, chloride ion transport by these compounds specifically triggers apoptosis in cancer cells while demonstrating relatively low toxicity toward non-cancerous cell lines.

Synthesis of Iron(IV) Alkynylide Complexes and Their Reactivity to Form 1,3-Diynes.

The isolation of thermally unstable and highly reactive organoiron(IV) complexes is a challenge for synthetic chemists. In particular, the number of examples where the C-based ligand is not part of the chelating ligand remains scarce. These compounds are of interest because they could pave the way to designing catalytic cycles of bond forming reactions proceeding via organoiron(IV) intermediates. Herein, we report the synthesis and characterization, including single-crystal X-ray diffraction, of a family of alkynylferrates(III) and Fe(IV) alkynylide complexes. The alkynylferrates(III) are formed by transmetalation of the Fe(III) precursor [(N3N')FeIII] (N3N'3- is tris(N-tert-butyldimethylsilyl-2-amidoethyl)amine) with lithium alkynylides, and their further one-electron oxidation enables the synthesis of the corresponding Fe(IV) alkynylides. The electronic structure of this family of organometallic Fe(III) and Fe(IV) complexes has been thoroughly investigated by spectroscopic methods (EPR, NMR, 57Fe Mössbauer, X-Ray absorption (XAS) and emission (XES) spectroscopies) and theoretical calculations. While alkynylferrates(III) are sluggish to engage into C-C bond forming processes, the Fe(IV) alkynylides react to afford 1,3-diynes at room temperature. A bimolecular reductive elimination from a bimetallic Fe(IV) intermediate to form the 1,3-diynes is proposed based on the mechanistic investigations performed.

Single-Component Coordination Polymers with Excitation Wavelength- and Temperature-Dependent Long Persistent Luminescence toward Multilevel Information Security.

Metal-organic hybrid materials with long persistent luminescence (LPL) properties have attracted a lot of attention due to their enormous potential for applications in information encryption, anticounterfeiting, and other correlation fields. However, achieving multimodal luminescence in a single component remains a significant challenge. Herein, we report two two-dimensional LPL coordination polymers: {[Zn2(BA)2(BIMB)2]·2H2O}n (1) and {[Cd(BA)(BIMB)]·3H2O}n (2) (BIMB = 1,3-bis(imidazol-1-yl)benzene; BA = butanedioic acid). Their LPL colors can be adjusted by the excitation wavelength or temperature variation in a single-component coordination polymer, achieving multimode color adjustment from green to orange or blue to yellow. X-ray single-crystal diffraction analysis and theoretical calculations demonstrate that abundant intermolecular interactions, ligand-to-ligand charge transfer (LLCT) transitions, and heavy atom effects of the central metal can realize multicolor afterglow. This work provides a convenient strategy for new pattern multicolor LPL materials and may also inspire new ideas for advanced information encryption technologies.

Three New Dipeptide and Two New Polyketide Derivatives from the Mangrove-Derived Fungus Talaromyces sp.: Antioxidant Activity of Two Isolated Substances

Five new metabolites, including three cyclic dipeptide derivatives (1–3) and two new polyketides (10–11), together with nine known ones (4–9 and 12–15), were isolated from the mangrove-sediments-derived fungus Talaromyces sp. SCSIO 41431. Their structures were determined using detailed NMR, MS spectroscopic analyses, and quantum chemical calculations. X-ray single-crystal diffraction analysis of 1 was described. Compounds 13–15 demonstrated activity against Staphylococcus aureus, with MIC values ranging from 25 to 50 µg/mL. Compound 9 showed activity against Escherichia coli, Streptococcus suis, and Erysipelothrix rhusiopathiae, with an MIC value of 100 µg/mL. In addition, compounds 1 and 12 showed DPPH radical scavenging activity, with the EC50 of 27.62 and 29.34 µg/mL, compared to the positive control (ascorbic acid, EC50, 12.74 µg/mL).

Construction and Magnetic Difference of {CoIIICoII12MII6} (M = CoII/CdII) Aggregates with Homo- and Heterometallic Centers Derived from {Co14} Precursors.

Controllable synthesis of sophisticated aggregations has attracted wide attention from scientists. In this work, homo- and heterometallic {CoIIICoII12MII6} (M = CoII/CdII) aggregates with similar skeletons, composed of two [Co3M3(dpbt)3] peripheries and a central [Co7(OH)8] vertex-fused double-cubane, were constructed from prefabricated {Co14} clusters and characterized by single-crystal X-ray diffraction and XPS, ICP-MS, SEM (EDX), and so on. And then, the structure and magnetic differences of them had been further analyzed under dotted with paramagnetic CoII ions and/or diamagnetic CdII ions. Interestingly, the spin canting behavior in {CoIIICoII18} was suppressed in {CoIIICoII12CdII6}, upon the introducing of CdII ions.

Reactivity Study of the Bis(phosphine)-Stabilized Antimony(I) Cation.

The 5,6-Bis(diisopropylphosphino)acenaphthene L-stabilized Sb(I) cationic compound [LSb][OTf] (OTf = CF3SO3) 1 possessing two lone pairs of electrons on the Sb(I) center showed nucleophilic behavior toward methyl trifluoromethanesulfonate forming the oxidized product [LSbMe][OTf]2 2 (OTf = CF3SO3). Reaction of compound 1 with Lewis acids such as GaCl3 and AlBr3 led to changes in the counteranions only giving products [LSb][GaCl4] 3 and [LSb][SbBr4] 4, respectively. A metathesis reaction was observed when compound 1 was reacted with PI3. The Sb(I) cation in 1 underwent the metathesis reaction with the P(I) cation, forming the more stable product [LP][OTf] 5. The Sb(I) center in 1 was completely oxidized to Sb(V) by reacting with two equivalents of o-chloranil to give the Bis(phosphine)-stabilized Bis(perchloro catecholato)stibonium cation [L(O2C6Cl4)2Sb][OTf] 6. Both compounds 1 and 6 were employed as proof-of-concept Lewis acid catalysts for the hydrosilylation of p-methyl benzaldehyde. All the compounds were characterized using single-crystal X-ray diffraction analysis, multinuclear nuclear magnetic resonance spectroscopy, mass spectrometry, and absorbance spectroscopy. Density functional theory calculations were performed on the relevant compounds.

Self-assembly of supramolecular double helix from a tetrapeptide and direct visualization by Scanning Tunneling Microscopy.

This work reports single-crystal X-ray diffraction (XRD), Scanning Tunneling Microscopy (STM), and quantum mechanics calculations of the 310-helical peptide Z-(Aib)2-L-Dap(Boc)-Aib-NHiPr (Aib, α-aminoisobutyric acid; Dap, 2,3-diaminopropionic acid; Z, benzyloxycarbonyl; Boc, t-butoxycarbonyl). The peptide forms a double-helical superstructure, studied by XRD and STM. Such architecture is rare in short peptides. Here, we show, by combining XRD, STM that this intriguing conformational feature is not driven by crystal packing; rather, it is an intrinsic property of this peptide. Indeed, the double helix is clearly detected also by STM, where crystal packing cannot be invoked. XRD reveals that intermolecular H-bonds stabilize two left-handed supra-helices (tertiary structure) that develop around a 6-fold screw axis. Then, two supra-helices are intertwined in a quaternary structure as a left-handed, double supra-helix, where C-H⋯π interactions play a crucial role. STM images show the formation of long, isolated "necklaces" (> 110 nm). They are of left and right helical handedness. Their size agrees with the XRD finding. DFT calculations allowed us to weigh the contribution of the different intermolecular interactions in the two single supra-helices and the supramolecular double-helix. Interestingly, we were able to conclude that the contribution of the C-H⋯π interactions to the binding energies is close to 50%.

Combination of phenylsilsesquioxane and acetate ligands as an approach to a record high nuclear Cu13Na2-cage. Synthesis, unique structure, and catalytic activity.

Self-assembly synthesis of mixed-ligand (silsesquioxane/acetate) complex allows to isolate record high nuclear copper(II) Cu13-cage (1). In the presence of two additional sodium ions, a unique molecular architecture, with triple combination of ligands (cyclic and acyclic silsesquioxanes as well as acetates), has been formed. The structure was established by single-crystal X-ray diffraction based on the use of synchrotron radiation. Complex 1 was evaluated as precatalyst in the Baeyer-Villiger oxidation of cyclohexanone towards ε-caprolactone, employing hydrogen peroxide, tert-butyl hydroperoxide (TBHP) or m-chloroperoxybenzoic acid (mCPBA) as oxidants, in an aqueous acidic acetonitrile medium. The direct formation of the lactone from cyclohexane via a tandem peroxidative oxidation/Baeyer-Villiger oxidation was also studied. For both substrates, the best results (ε-caprolactone yields up to 100% or 26%, from cyclohexanone or cyclohexane, respectively) were achieved with mCPBA under considerably mild conditions, i.e., conventional heating at 50 °C for 4 h or microwave (MW) irradiation at 80 °C for only 30 minutes.

Abstract A003: In vitro anticancer activities of some organoplatinum (IV) derivatives

Abstract Recent investigations into organoplatinum (IV) complexes as potential anticancer agents have shown considerable promise. Unlike cisplatin, these compounds are more stable in physiological environments and generally exhibit fewer side effects. Additionally, chelating aromatic ancillary ligands have been found to enhance the intercalation of metal-based agents into tumor DNA. This study aimed to synthesize novel organoplatinum (IV) complexes with chelating aromatic ligands and evaluate their anticancer efficacy through in vitro assays. Five complexes were synthesized: [Pt(CH3)2X2{2,2’-bipyridine-4,4’-R2}] (X = Br, I; R = H, CO2H) and [{Pt(CH3)3}2(μ-I)2(μ-adenine)]. These were characterized by single crystal X-ray diffraction and assessed for anticancer activity. The MTT assays indicated that the [Pt(CH3)2X2{2,2’-bipyridine}] complexes were more cytotoxic to the ZR-75-1 human breast cancer cell line than cisplatin, with LC50 values of 6.1 µM for X = I, 11.5 µM for X = Br, compared to 16.4 µM for cisplatin. Furthermore, the sulforhodamine B assays conducted by the National Cancer Institute's Developmental Therapeutics Program revealed that [Pt(CH3)3}2(μ-I)2(μ-adenine)] was highly effective against various cancer cell lines. Notably, it showed an LC50 value of 5.20 µM against the glioblastoma multiforme SF-539 cell line, whereas cisplatin and temozolomide had LC50 values exceeding 100 µM. Similarly, [Pt(CH3)3}2(μ-I)2(μ-adenine)] had an LC50 value of 5.99 µM against the renal carcinoma RXF-393 cell line, with cisplatin and cabozantinib showing LC50 values above 100 µM. While these results highlight the superior cytotoxicity of the tested organoplatinum (IV) complexes, further research and development are required before these compounds can be considered for commercial use as chemotherapy drugs. Citation Format: William A. Howard. In vitro anticancer activities of some organoplatinum (IV) derivatives [abstract]. In: Proceedings of the AACR Special Conference in Cancer Research: Optimizing Therapeutic Efficacy and Tolerability through Cancer Chemistry; 2024 Dec 9-11; Toronto, Ontario, Canada. Philadelphia (PA): AACR; Mol Cancer Ther 2024;23(12_Suppl):Abstract nr A003

Gradient Luminescence Enhancement in Organic Metal Halide Perovskites via the Suppression of [SbCln]3-n Unit Distortion.

Intrinsic stereochemical activity of the 5s2 electron configuration in Sb3+ leads to structural distortion within [SbCln]3-n units, which, while stabilizing the material, paradoxically diminishes luminescence intensity due to induced asymmetry. To address this issue, a strategy, which encompasses increasing the structural dimensions and introducing In3+ doping, was developed to mitigate the geometrical distortion in the [SbCln]3-n units within the metal-organic perovskite (DABCO)2Sb2Cl10·H2O and (DABCO)2SbCdCl9·2H2O (DABCO = triethylenediamine). This dimensional augmentation confines lattice distortion effectively, and the In3+ doping modifies the 5s2 electron configuration of Sb3+, thereby reducing the distortion at its origin. The unique suitability of indium-based halides as a matrix for Sb3+ doping is underscored by our approach, which capitalizes on their ability to regulate the electron configuration of Sb3+. This strategy has been validated through crystallographic data from single-crystal X-ray diffraction. By effectively reducing the adverse effects of geometric distortion, several hundred-fold enhancements in the luminescent intensity of the material have been achieved by our methodology, leading to potential applications in white-light LEDs. This advancement not only highlights the pivotal role of structural symmetry in the optical properties of materials but also exemplifies the power of material engineering to optimize the optical performance.

The crystal structures of methyl prop-2-ynoate, dimethyl fumarate and their protonated species.

Methyl prop-2-ynoate (C4H4O2) was investigated in the binary superacidic system HF/MF5 (M = Sb or As) and dimethyl fumarate (C6H8O4) in the superacidic system HF/SbF5, as well as HF/BF3. The starting materials methyl prop-2-ynoate and dimethyl fumarate were crystallized, the former for the first time. The protonated species of these esters, namely, (1-methoxyprop-2-yn-1-ylidene)oxidanium hexafluoroarsenate, C4H5O2+ AsF6-, 1,4-dimethoxy-4-oxobut-2-en-1-ylidene]oxidanium tetrafluoroborate bis(hydrogen fluoride), C6H9O4+ BF4- 2HF, and hemi{[1,4-dimethoxy-4-oxidaniumylidenebut-2-en-1-ylidene]oxidanium} undecafluorodiantimonate, 0.5C6H10O42+ Sb2F11-, were characterized by single-crystal X-ray diffraction and Raman spectroscopy. The protonated species were recrystallized from anhydrous hydrogen fluoride. In the solid state of the monoprotonated species of methyl prop-2-ynoate and the diprotonated species of dimethyl fumarate, strong intramolecular O-H...F hydrogen bonds build a three-dimensional network. The monoprotonated species of dimethyl fumarate builds chains by strong O-H...O hydrogen bonds between the cations.

Chemical Synthesis of ~1 nm Multilevel Capacitor-like Particles with Atomic Precision.

Can the chemically synthesized nanoparticles act as nanodevices or nanomachines? Herein, we demonstrated this feasibility. A novel nanocluster (ultrasmall nanoparticle) [Au44Cd20(m-MBT)40][N(C8H17)4]2 (Au44Cd20 in short, m-MBTH: m-methylbenzenethiol) obtained via developing a synthesis method has a cannula-like structure of the outer shell and an internal sleeve, revealed by single-crystal X-ray diffraction. Natural population analysis (NPA) charge calculations, charge carrier transport of Au44Cd20 (during which an intra-nanocluster anti-galvanic reaction was observed) after unneutral charging using NaBH4 as well as voltammetry proved the capacitor-like character of Au44Cd20. The subsidiary capacitor-like character of the outer shell of Au44Cd20 was further probed via NPA charge calculations and electrocatalytic reduction of CO2 to CO. Thus, this study predicts a new era of engineering metal nanoparticles for realizing atomically precise ultrasmall nanodevices and nanomachines.

Cadmium(II)-Organic Frameworks with the Polynuclear Unit: Dimensionality Control and Luminescence Response to Pyridine

New porous metal-organic frameworks (MOF) [Cd7(Btdc)7(Bpa)2(Dmf)2(H2O)2] · 15Dmf · 2H2O (I) and [Cd7(Btdc)7(Bpe)2(Dmf)2] · 15Dmf · 3H2O (II) (H2Btdc is 2,2’-bithiophene-5,5’-dicarboxylic acid, Bpa is 1,2-bis(4-pyridyl)ethane, Bpe is 1,2-bis(4-pyridyl)ethylene, and Dmf is N,N-dimethylformamide) are synthesized under solvatothermal conditions. The structures and compositions of the compounds are determined by single-crystal X-ray diffraction (XRD) (CIF files ССDС nos. 2364290 (I) and 2364289 (II)) and confirmed by powder XRD, elemental analysis, thermogravimetry, and IR spectroscopy. Compound I has a 2D structure based on the heptanuclear discrete building unit {Cd7} with the linear structure. Compound II is a 3D MOF in which the {Cd7} building units are linked into a continuous chain motif due to additional interactions. The formation of discrete or continuous chains is directly related to the nature of the N-donor bridging ligand (Bpe or Bpa). Compounds I and II have open structures with the accessible volume about 50%. The solvate molecules are replaced by thiophene, benzene, and pyridine, and the luminescence properties of the prepared adducts are studied. Luminescence quenching in the presence of thiophene and an increase in the luminescence intensity in the presence of pyridine accompanied by a change in the quantum yield by 4–5 times are shown.

Neutral Terbium(III) Tris(complex) with 4,4,5,5,6,6,6-Heptafluoro-1-(1-methyl-1H-pyrazol-4-yl)hexane-1,3-dione: Synthesis, Structure, and Spectral Luminescence Properties

The reaction of 1,3-diketone containing 1-methyl-1H-pyrazol-4-yl and perfluoropropyl fragments with TbCl3·6H2O in the presence of NaOH in ethanol is studied. The molecular and crystal structures of the complex are studied by single-crystal X-ray diffraction (XRD). Compound [Tb(L)3(EtOH)2] crystallizes in the triclinic crystal system with the space group. The geometry of the coordination polyhedron {LnO8} corresponds to a square antiprism. Intermolecular interactions N…H–O, C–H…O, and C–H…F leading to the formation of supramolecular chains are observed in crystals of the complex. The UV-irradiated complex exhibits green luminescence caused by transitions 5D4 → 7Fj (j = 2–6) characteristic of the Tb3+ ion. The main photophysical luminescence parameters are determined, and the scheme of energy transfer in the complex is proposed. The synthesized compound can be of interest as an independent luminophore or as the initial substance for the synthesis of heteroligand complexes by the substitution of ethanol molecules in the internal coordination sphere.