Roman G. Parkhomenko

Syntheses, structures, and thermal properties of new Au(III) organometallic compounds with ancillary S-, O-, and/or N-donor ligands

((CH3)2Au)2C2O4 (1), ((CH3)2AuSCN)2 (2), (CH3)2AuSSP(OCH3)2 (3), and (CH3)2AuSSP(OC2H5)2 (4) were prepared and recrystallized from hexane to determine their crystal structures and analyze them by thermal methods (TGA). The compounds have been investigated as new possible precursors for metal–organic chemical vapor deposition (MOCVD). Compounds 1 and 2 are solids, while 3 and 4 are liquids. Crystal structures of 1 and 2 have been studied by single-crystal X-ray diffraction (XRD): compounds are monoclinic, space group for 1 P21/c, for 2 P21/n. Compound 1 has crystal parameters a = 7.6952(5) Å, b = 11.1814(8) Å, c = 12.2893(8) Å, α = 90°, β = 104.922(4)°, γ = 90°; 2 has crystal parameters a = 5.6184(3) Å, b = 15.2744(6) Å, c = 6.9202(3) Å, α = 90°, β = 102.864(2)°, γ = 90°. These are neutral complexes, in which molecules are only connected by van der Waals interactions. Thermal gravimetric analyses (TGA) have shown that 3 and 4 evaporate practically without decomposition. MOCVD experiments were carried out at lower pressure using 3 and 4 as precursors. The films were grown on Si substrate and investigated by XRD and SEM.

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

Abstract In this work, the crystalline structure of single crystals grown by vacuum sublimation of unsubstituted palladium phthalocyanines (PdPc), its tetrafluorinated (PdPcF 4 ) and hexadecafluorinated (PdPcF 16 ) derivatives have been investigated using X-ray diffraction measurements. Two crystalline phases have been identified for PdPc; the molecules in both phases crystallize in stacks with herringbone arrangement in the monoclinic space groups ( C 2/ c for α-PdPc; P2 1 /n for γ-PdPc). Both PdPcF 4 and PdPcF 16 crystallize in the triclinic P-1 space group, forming stacks of molecules in columnar arrangement with molecules in adjacent columns aligned parallel to one another. X-ray diffraction measurements have also been used to elucidate the structural features and molecular orientation of thin films of PdPc, PdPcF 4 and PdPcF 16 , grown by organic molecular beam deposition at different substrate temperatures. The effect of fluorosubstitution on UV-visible optical absorption and vibrational spectra of palladium phthalocyanine derivatives is also discussed.

Volatile dimethylgold(III) complex with di-iso-butyldithiophosphinate ligand: synthesis, structure, and thermal behavior in condensed and gas phase

Synthesis and molecular structure of air stable, low-melting dimethylgold(III) complex with dithiophosphinate (CH3)2AuS2PiBu2 (iBu=CH2CH(CH3)2), its thermal properties, and the features as precursor for the metal–organic chemical vapor deposition of gold films are reported. Thermal behavior of the compound in the condensed and gas phase was studied by thermogravimetric analysis and mass spectrometry. Pathways of heterogeneous thermolysis of the compound to elemental gold are discussed. It was found that α-P–H elimination followed by coupling of two alkenyl groups from the coordinated ligand is one of the main thermolysis pathways in condensed and gas phase.

Characterization of the structure and stimulated emission of spherical and cylindrical spasers

In this paper, experimental realization of the surface plasmon laser in a solution for the visible and near infrared region (VNIR) based on the hybrid nanoparticles with a 13-nanometre gold core or the nanorod with various aspect ratios surrounded by a 20-40 nm thick dye-embedded silica shell (fluorescein or DCM) was presented. The spasing in those structures using the methods of confocal microscopy, TEM was experimentally studied.