Thermochemistry of Solid-State Formation, Structure, Optical, and Luminescent Properties of Complex Oxides EuMeO (Me-Mo, W), EuWO: A Combined Experimental and DFT Study.

Complex oxides EuMeO (Me-Mo, W), EuWO were obtained by a solid-phase reaction between binary oxides. The thermodynamic and kinetic mechanisms of the reaction processes were established using a variety of physical-chemical methods. All compounds obtained in this work crystallize in the low-symmetry monoclinic system, forming complex framework structures, which determine a set of very valuable physical-chemical properties.

Negative Thermal Expansion in the Polymorphic Modification of Double Sulfate β-AEu(SO) (A-Rb, Cs).

New polymorphic modifications of double sulfates β-AEu(SO) (A-Rb, Cs) were obtained by the hydrothermal method, the structure of which differs significantly from the monoclinic modifications obtained earlier by solid-state methods. According to single-crystal diffraction data, it was found that the compounds crystallize in the orthorhombic system, space group , with parameters β-RbEu(SO): = 9.4667(4) Å, = 13.

Structural, Spectroscopic, Electric and Magnetic Properties of New Trigonal KFeHf(MoO) Orthomolybdate.

A new multicationic structurally disordered KFeHf(MoO) crystal belonging to the molybdate family is synthesized by the two-stage solid state reaction method. The characterization of the electronic and vibrational properties of the KFeHf(MoO) was performed using density functional theory calculations, group theory, Raman and infrared spectroscopy. The vibrational spectra are dominated by vibrations of the MoO tetrahedra, while the lattice modes are observed in a low-wavenumber part of the spectra.

A Challenge toward Novel Quaternary Sulfides SrLnCuS (Ln = La, Nd, Tm): Unraveling Synthetic Pathways, Structures and Properties.

We report on the novel heterometallic quaternary sulfides SrLnCuS (Ln = La, Nd, Tm), obtained as both single crystals and powdered samples. The structures of both the single crystal and powdered samples of SrLaCuS and SrNdCuS belong to the orthorhombic space group but are of different structural types, while both samples of SrTmCuS crystallize in the orthorhombic space group with the structural type KZrCuS. Three-dimensional crystal structures of SrLaCuS and SrNdCuS are formed from the (Sr/Ln)S capped trigonal prisms and CuS tetrahedra.

Exploration of the Crystal Structure and Thermal and Spectroscopic Properties of Monoclinic Praseodymium Sulfate Pr(SO).

Praseodymium sulfate was obtained by the precipitation method and the crystal structure was determined by Rietveld analysis. Pr(SO) is crystallized in the monoclinic structure, space group 2/, with cell parameters = 21.6052 (4), = 6.

Quaternary Selenides EuLnCuSe: Synthesis, Structures, Properties and In Silico Studies.

In this work, we report on the synthesis, in-depth crystal structure studies as well as optical and magnetic properties of newly synthesized heterometallic quaternary selenides of the EuLnCuSe composition. Crystal structures of the obtained compounds were refined by the derivative difference minimization (DDM) method from the powder X-ray diffraction data. The structures are found to belong to orthorhombic space groups (structure type BaMnS for EuLaCuSe and structure type EuCuS for EuLnCuSe, where Ln = Sm, Gd, Tb, Dy, Ho and Y) and (structure type KZrCuS for EuLnCuSe, where Ln = Tm, Yb and Lu).

Structural and Spectroscopic Effects of Li Substitution for Na in LiNaCaGdHoYb(MoO) Scheelite-Type Upconversion Phosphors.

A set of new triple molybdates, LiNaCaGd(MoO):Ho/Yb, was successfully manufactured by the microwave-accompanied sol-gel-based process (MAS). Yellow molybdate phosphors LiNaCaGd(MoO):Ho/Yb with variation of the LiNa (x = 0, 0.05, 0.

Structure, Thermal Stability, and Spectroscopic Properties of Triclinic Double Sulfate AgEu(SO) with Isolated SO Groups.

Silver-europium double sulfate AgEu(SO) was obtained by solid-phase reaction between AgSO and Eu(SO). The crystal structure of AgEu(SO) was determined by Monte Carlo method with simulated annealing, and after that, it was refined by the Rietveld method from X-ray powder diffraction data. The compound crystallizes in the triclinic symmetry, space group P1̅ ( a = 0.

Aptamer-Targeted Plasmonic Photothermal Therapy of Cancer.

Novel nanoscale bioconjugates combining unique plasmonic photothermal properties of gold nanoparticles (AuNPs) with targeted delivery using cell-specific DNA aptamers have a tremendous potential for medical diagnostics and therapy of many cell-based diseases. In this study, we demonstrate the high anti-cancer activity of aptamer-conjugated, 37-nm spherical gold nanoparticles toward Ehrlich carcinoma in tumor-bearing mice after photothermal treatment. The synthetic anti-tumor aptamers bring the nanoparticles precisely to the desired cells and selectively eliminate cancer cells after the subsequent laser treatment.

Comparative Analysis of Methods for Enhancement of the Photostability of CdTe@TGA QD Colloid Solutions.

The employment of colloid quantum dots in a number of applications is limited by their instability under light irradiation. Additional methods of photostability enhancement of UV+visible-irradiated TGA-stabilized CdTe quantum dots are investigated. Photostability enhancement was observed via either addition of sodium sulphite in the role of chemical oxygen absorber or addition of 1% gelatin, or, finally, by additional stabilization by bovine serum albumine (BSA).

Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO):Er/Yb: structural and spectroscopic properties.

Triple molybdate NaCaLa(MoO):xEr,yYb (x = y = 0, x = 0.05 and y = 0.45, x = 0.

Laser-induced wavelength-controlled self-assembly of colloidal quasi-resonant quantum dots.

Self-assembly of colloidal semiconductor quantum dots controlled solely by laser-induced interaction is demonstrated for the first time. Pairs of CdTe nanoparticles are formed under irradiation with nanosecond pulses at wavelengths 555 or 560 nm. Formation of pairs is justified by corresponding changes of absorption spectra.

Generation of coherent radiation in the vacuum ultraviolet using randomly quasi-phase-matched strontium tetraborate.

Tunable coherent radiation is generated in the vacuum ultraviolet down to 121 nm using random quasi-phase matching in strontium tetraborate, the shortest wavelength ever produced with a second-order nonlinear optical process in a solid-state material. Relevant properties of this radiation, the nonlinear process, and the nonlinear crystal are investigated.

The modulated structure and frequency upconversion properties of CaLa2(MoO4)4:Ho(3+)/Yb(3+) phosphors prepared by microwave synthesis.

CaLa2-x(MoO4)4:Ho(3+)/Yb(3+) phosphors with the doping concentrations of Ho(3+) and Yb(3+) (x = Ho(3+) + Yb(3+), Ho(3+) = 0.05; Yb(3+) = 0.35, 0.

Spectral fringes in non-phase-matched SHG and refinement of dispersion relations in the VUV.

We consider second harmonic generation (SHG) of ultrashort pulses in the case of strong phase- and group-velocity mismatch. Spectral fringes appear in the second harmonic related to two delayed replicas of the fundamental pulse in the time domain. The fringe separation can be used to evaluate the group-velocity and refractive index of nonlinear crystals at extreme wavelengths.