N. V. Petrochenkova

Sensitization of luminescence of antimony(III) in complexes with 6-methylquinoline in the spectral region of the A band

The luminescence properties of complexes of antimony (III) halides with 6-methylquinoline: (C10H9NH)4Sb2Cl10 (I), (C10H9NH)3SbBr6 (II), and (C10H9NH)4Sb2I10 (III) are studied. From analysis of data obtained by UV, photoelectron, and luminescence spectroscopy, it is concluded that the decrease in the energy gap between the highest occupied and lowest unoccupied molecular orbitals of the 6-methylquinoline molecules and antimony (III) halides is responsible for quenching of the luminescence of the 6-methylquinolinium cations and for occurrence of intrinsic luminescence of the antimony (III) ions in going from complex I to complexes II and III.

Lanthanide-Containing Monomers Produced from Unsaturated Acids: Synthesis, Polymerization, and Spectral and Luminescent Properties. Crystal Structure of Europium(III) Methacrylate

Synthesis of lanthanide-containing (Ln = Eu, Tb, Nd, Gd) monomers based on unsaturated acids is described, namely, of LnL13 · nH2O (L1 are anions of acrylic and methacrylic acids) and Ln2L23 · nH2O (L2 are anions of maleic and fumaric acids); n = 0–3, 6. The compounds were characterized by elemental analysis, thermogravimetry, and IR and luminescence spectroscopy. Europium methacrylate Eu(Macr)3 was studied using X-ray diffraction analysis: rhombic system, a = 14.831(3) Å, b = 12.964(2) Å, c = 7.761(1) Å, space group Cmc21, V = 1483.5(4) Å3, ρ(calcd) = 1.823 g/cm3. Infinite chains of Eu(Macr)3 molecules are directed along crystallographic axis c and are bound by van der Waals interactions. Radical polymerization of Eu(III) and Tb(III) acrylates and Eu(III) methacrylate yields lanthanide-containing polymers with a high content of Ln (40–50 mass %). Their spectral and luminescent properties are studied.

Antimony(III) Chloride Complexes with Benzylpyridines: Synthesis and Luminescence. Crystal Structure of Bis(2-benzylpyridinium) Pentachloroantimonate(III)

AbstractThe antimony(III) chloride complexes with 2- and 4-benzylpyridine were synthesized and studied using elemental analysis, X-ray diffraction analysis, IR spectroscopy, and luminescence spectroscopy. The crystal structure of bis(2-benzylpyridinium) pentachloroantimonate(III) was determined. The crystals are triclinic: a = 9.628(1) Å, b = 15.284(2) Å, c = 19.174(2) Å, α = 99.962(2)°, β = 101.233(2)°, γ = 99. 216(2)°; Z = 4, ρ(calcd) = 1.591 g/cm3, space group P

Crystal structure and triboluminescence of tetraethylammonium tetrakis(thenoyltrifluoroacetonato)europium

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Photochemical behavior of polymer complexes based on Eu(III) acrylato(bisdibenzoylmethanate)

, R = 0.0358. The structure consists of polymeric chains of [Sb2Cl10]4n–n anions and [C12H11NH]+ cations combined into a framework by the N–H···Cl hydrogen bonds. The electronic and geometrical factors responsible for a relatively low intensity of the luminescence emitted by the complexes of antimony(III) chloride with 2- and 4-benzylpyridine at 77 K are discussed.

Electronic structure of europium(iii) acrylate and methacrylate: an X-ray photoelectron spectroscopy and quantum chemical study

The effect of ammonia vapor on luminescence of Eu(III) tris-dibenzoylmethanate immobilized in various matrices has been investigated. It has been revealed that interaction of Eu(III) tris-dibenzoylmethanate with analyte vapor results in increase of the intensity of Eu(III) luminescence. The mechanism of the effect of ammonia vapors on intensification of the Eu(III) luminescence has been suggested using the data of IR spectroscopy, X-ray diffraction analysis and quantum chemistry calculations. The mechanism of luminescence sensitization consists in bonding of an analyte molecule with a water molecule into the coordination sphere of Eu(III). As a result, the bond of a water molecule with the luminescence centre weakens and the blockage of the quenching of luminescence on OH-vibrations takes place.

Luminescent chemosensors for amines and ammonia based on Eu(III) chelate complexes

An atomic structure of complex Et4N[Eu(ТТA)4] (TTA is the thenoyltrifluoroacetonate anion, Et4N+ is the tetraethylammonium cation) possessing strong luminescence and triboluminescence was determined by X-ray crystallography. The crystal system of centrosymmetric crystals is monoclinic: a = 10.2495(1) Å, b = 20.2162(3) Å, c = 23.5788(3) Å, β = 102.551(1)°, space group P21/c, Z = 4, dcalc = 1.625 g cm–3. The crystals of the compound have an isle structure, which comprises individual complex anions [Eu(TTA)4]– and tetraethylammonium cations Et4N+. The structural aspects of a possible model for the formation of triboluminescent properties were considered, the role of cleavage planes and disordering was discussed.

Antenna effect in macromolecular complexes of Eu3+ dibenzoylmethanate with poly(acrylic acid) containing chromophoric groups

The effect of methylamine vapor on luminescence of Eu(III) tris-benzoylacetonate (I) immobilized in thin-layer chromatography plates has been investigated. It has been revealed that interaction of I with analyte vapor results in increase of the intensity of Eu(III) luminescence. The mechanism of the effect of methylamine vapors on intensification of the Eu(III) luminescence has been suggested using the data of IR spectroscopy and quantum chemistry calculations. The mechanism of luminescence sensitization consists in bonding of an analyte molecule with a water molecule into the coordination sphere of Eu(III). As a result, the bond of a water molecule with the luminescence centre weakens, rigid structural fragment including europium ion, water and methylamine molecules forms. The presence of such fragment must naturally promote decrease of influence of OH-vibrations on luminescence of the complex I.