Ternary Samarium Research Articles

Luminescent heteroleptic samarium (III) complexes: Synthesis, optical and photophysical investigation

• We have synthesized photoluminescent ternary samarium β-diketonate complexes with heterocyclic neutral ligands. • Optical and luminescent nature of red color emissive ternary samarium complexes have been studied in detail. • Photoluminescence emission spectra specify that β-diketone ligand efficiently sensitized Sm(III) ion via antenna effect. • Synthesized luminescent materials could found good significance in solid state electronics, flat panel devices and OLEDs. The octa coordinated complexes of Sm 3+ with dibenzoylmethane (DBM) having general formula [Sm(X) 3 (Y)] were synthesized in powdered form and characterized spectroscopically. Here, X is dibenzoylmethane (DBM) and Y represents respective substituted 2,2 ′ -bipyridine derivatives. The luminescent characteristics of ternary samarium complexes have been studied in detail. Upon excitation in UV range, bands at 566 nm, 606 nm, 648 nm (highly intense) and 710 nm were appeared in emission spectra of complexes attributed to characteristic transitions of Sm(III) ion. The luminescence in complexes is observed mainly because of (i) good sensitization of Sm(III) ion by auxiliary units (ii) removal of non-radiative deactivation routes by vibrations of O-H and N-H bonds. Various investigations reveal the similar structure of all the synthesized samarium complexes. The emissive properties of Sm(III) complexes show that these complexes might be utilized as good candidate in lighting and display sources.

Preparation, optoelectronic and spectroscopic analysis of fluorinated heteroleptic samarium complexes for display applications

Octacoordinated complexes of samarium were prepared with fluorinated diketone and bidentate N donor auxiliary ligands. These complexes were characterized by various spectroscopic techniques and thermo-gravimetric analyses. The spectral outcomes of all the complexes are reliable with the coordination of three TTA and one neutral unit to samarium ion via oxygen and nitrogen atom respectively. Energy band gap values (3–4 eV) support the conducting behavior of synthesized complexes. Photoluminescence spectra of ternary complexes illustrate the reddish orange emission at 648 nm (4G5/2→6H9/2) based on Sm3+ ion. Photoluminescence emission spectra and color coordinates suggest the luminous behavior of ternary samarium complexes. The singlet and triplet state energy of sensitizing ligands were calculated which point out towards the potential transfer of energy from sensitizing unit to the central ion. The photophysical parameters demonstrate that the complexes might be the promising candidate in displays and light emitting devices.

Synthesis and characterization of three ternary samarium(III) complexes and their optical properties

Three ternary samarium(III) complexes with 6-methyl-4-oxo-4H-1-benzopyran-3-carboxaldehyde, 4-methyl-1,10-Phenanthroline, and 2,2′-Biquinoline and Bathocuproine have been prepared and characterized. The complexes exhibit crystalline character and excellent thermal stability. On irradiation with ultraviolet radiation, the complexes display characteristic emission peaks of samarium(III) ion. The color coordinates, decay curves, and quantum yield have been discussed in detail. The investigations demonstrate that the synthesized complexes might be practically useful in bio-assays, electroluminescent devices, and liquid lasers due to their fascinating optical properties.

Towards white light emission from a hybrid thin film of a self-assembled ternary samarium(iii) complex

A new samarium(iii) complex, [Sm(hfaa)3(Py-Im)], has been prepared and fabricated into thin films which show color tunability from violet to orange depending on the concentration of doping within the film.

Preparation, and Luminescence Properties of SiO2@Sm(MABA-Si)phen Core-Shell Structure Nanometer Composite

A novel ternary samarium complex was prepared using HOOCC6H4N(CONH(CH2)3Si- (OCH2CH3)3)2 (MABA-Si) as first ligand, and phen as second ligand. The corresponding SiO2@Sm(MABA-Si)phen core-shell structure nanometer composite was synthesized as well, and the silica spheres was the core, and the ternary samarium complex was the shell layer. The ternary samarium complex has been characterized by element analysis, molar conductivity and IR spectra. The results show that the chemical formula of the complex is Sm(MABA-Si)(phen)2(ClO4)3·2H2O. The fluorescent spectra illustrat that the luminescence properties of the samarium complex are superior. The core-shell structure of SiO2@Sm(MABA-Si)phen nanometer composite is characterized by SEM, TEM and IR spectra. The SiO2@Sm(MABA-Si)phen core-shell structure composites exhibit stronger emission intensity than the ternary samarium complex. The fluorescence lifetime of the complex and core-shell structure composite is measured as well.

An experimental and quantum mechanical study on luminescence properties of SM(β-Nbm)3·(Pd)

A new ternary samarium complex Sm(β-NBM)3·(PD) has been synthesized by the reaction of SmCl3·6H2O with β-naphthoylbenzoylmethane (β-HNBM) and 1,10-phenanthroline-5,6-dione (PD) in stoichiometry. The new samarium complex obtained was characterized by elemental analysis, 1H NMR, and FT-IR spectroscopy. The absorption and emission of this complex were systematically investigated. Photoluminescence studies indicated that the energy absorbed by the organic ligands was efficiently transferred to the central Sm3+ ions and the complex showed intensely and characteristically orange emission due to the 4G5/2→6Hj transitions of the central Sm3+ ions. The energy levels (HOMO and LUMO) of the ligands and the complex were further confirmed by computer simulation and cyclic voltammetry, respectively. All the results suggested that the synthesized Sm(β-NBM)3·(PD) would have the potential application for organic light-emitting diodes.

Synthesis, X-ray structure and luminescent properties of Sm 3+ ternary complex with novel heterocyclic β-diketone and 1,10-phenanthroline (Phen)

A new neutral ternary samarium complex Sm(Phen)HL 3 in which Phen is 1,10-phenanthroline and HL is (1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione) was synthesized. Molecular structure of this complex was determined by X-ray diffraction. Under UV-light this complex is demonstrated bright red luminescence ( λ max=647 nm), which was corresponding to the electric dipole 4G 5/2→ 6H 9/2 transition in Sm 3+ ion. UV-absorption, excitation and emission spectra of the title compound were investigated.

Synthesis, luminescent properties and theoretical study of novel ternary samarium(III) and dysprosium(III) complexes

Two novel ternary Sm(III) and Dy(III) complexes, Sm(PPP)3phen and Dy(PPP)3phen, were synthesized by the reaction of 1-phenyl-3-(p-phenylethynylphenyl)-1,3-propanedione (HPPP) and 1,10-phenanthroline (phen) with samarium chloride and dysprosium chloride respectively and characterized by IR spectra, chemical analysis, elemental analysis and thermodynamic analysis. At room temperature, under UV light excitation, the Sm(III) and Dy(III) complexes exhibit characteristic emission of the central ions. It is found that HPPP ligand has some effect on the luminescent property of the rare earth complexes, and the experimental results were explained by quantum chemistry calculations.

Synthesis and structures of samarium platinum germanides: SmPtGe 2 and Sm 2Pt 3Ge 5

We performed single-crystal structure analysis of two ternary samarium platinum germanides SmPtGe 2 and Sm 2Pt 3Ge 5. SmPtGe 2 crystallizes in the space group (S.G.) Immm (no. 71) with a = 4.3679(9) Å, b = 8.728(2) Å, c = 16.378(4) Å, and V = 624.4(2) Å 3. This compound is isotypic with YIrGe 2 having a Ge 10Pt 4 subunit composed of edge-sharing five- and six-membered rings. SmPtGe 2 shows a metallic conductivity from room temperature down to 2 K. The magnetic susceptibility measurement showed a 3+ oxidation state for the samarium. Sm 2Pt 3Ge 5 crystallizes in the S.G. Ibam (no. 72) with a = 10.174(1) Å, b = 11.761(2) Å, c = 6.2142(8) Å, and V = 743.6(2) Å 3. It is isotypic with U 2Co 3Si 5 with a structure closely related to ThCr 2Si 2.

Electroluminescence based on a β-diketonate ternary samarium complex

The triplet energy state of the HTH [HTH: 4,4,5,5,6,6,6-heptafluoro-1-(2-thienyl)hexane-1,3-dione] ligand was measured to be 20 400 cm−1, which indicated that Sm(HTH)3phen (phen: 1,10-phenanthroline) is a good complex to produce strong PL intensity and high fluorescence yield. Electroluminescent (EL) devices using the Sm(HTH)3phen complex as the emissive center were fabricated by vapor deposition and spin-coating methods. The relative intensity of the EL spectra changed compared to the photoluminescence (PL) spectrum, which suggested that the luminescence mechanisms of PL and EL have differences. A luminance of 9 cd m−2 and a higher brightness of 21 cd m−2 were obtained from the devices ITO/TPD (40 nm)/Sm(HTH)3phen (50 nm)/PBD (30 nm)/Al (200 nm) and ITO/PVK (40 nm)/PVK∶Sm(HTH)3phen (2.5 wt%, 50 nm)/PBD (30 nm)/Al (200 nm), respectively.

Crystal Structure and Magnetic Properties of Sm3ReO7

Crystals of a new ternary samarium rhenium oxide, Sm3ReO7were obtained by subsolidus reaction of samariumsesquioxide and rheniumdioxide (ratio 1.5:1) in sealed Pt–10Rh-tubes at 1673 K. The structure was determined by single-crystal X-ray diffraction. Sm3ReO7crystallizes in the orthorhombic system with unit cell dimensionsa= 10.736(5),b= 7.392(3), andc= 7.519(3) in space groupCmcm(No. 63) withZ= 4. The structure consists of ReO6octahedra, distorted SmO6octahedra, and SmO8prisms that are interconnected to each other to form a three-dimensional network. Rhenium has the formal oxidation state of +5 but no metal–metal bond is observed in this compound. The observed magnetization in the temperature range 4 K <T< 52 K is explained by a Curie–Weiss law modified by a temperature independent Van Vleck paramagnetism of samarium (3+).

Untersuchungen im System Sm-C-N

An isothermal section at 1,000°C of the system Sm−C−N was examined by X-ray diffraction techniques. Complete solid solubility between the phases SmC1−x and SmN could be established. No indication for the existence of a ternary samarium carbonitride phase analogous to La1C0.88N0.77, could be found.