No abstract available

[en] Unusual twenty-membered cyclic dimer encapsulating two BF₄^- anions was obtained by the self-assembly of the tridentate N₂S donor ligand and silver ion. We are currently investigating the subtle factors influencing the formation of discrete or continuous complexes using dipicolyl sulfide derivatives including. It is a challenging work to capture ionic species or small molecules as guests. Thus, the construction of self-assembled cyclic oligomer complexes composed of metal centres connected by acyclic organic ligands has been a subject of great interest together with the inclusion phenomena of macrocyclic ligands in the supramolecular chemistry. The majority of the organic-inorgaic hybrid macrocyclic structures reported so far have been based on bis-monodentate ligands such as 4,4'-bipyridine and its derivatives interconnected by rigid or flexible spacers. The same type of ligands has been also used for the formation of coordination network

[en] We investigated the anion effects on the formation and PL of a series of silver(I) complexes containing new carbazole-decorated L. Nitrate anion acts as an anionic tectonic for the 1D coordination polymeric skeleton whereas other anions act as simple counteranions in the discrete [Ag(L)_2] skeletons. Furthermore, the PL intensity of the present coordination polymers has been known to be sensitive to the size of counteranions. More systematic researches, including modification of the related Ls, will provide more detailed information on the rational development of functional emitting materials sensitive to the external stimuli.

[en] We have used our new tridentate pyridine substituted N-heterocyclic carbene to generate an interesting trinuclear [((MepyCH₂)₂-Im)₃Ag₃]³⁺ complex, displaying very short Ag-Ag separations. A Pd(II)-NHC complex was prepared from [((MepyCH₂)₂-Im)₃Ag₃]³⁺ via a facile transmetallation, leading to a dimeric [(MepyCH₂)₂-ImPdCl]₂²⁺ complex. Future plans are underway for the survey of the potential applications of these new NHC complexes as luminesent materials or homogeneous catalysts. Since Arduengo's discovery of the first isolable free carbene in 1991, N-heterocyclic carbenes (NHC) have been extensively utilized as ligands for transition metals. NHC are generally more stable than two extreme types of carbenes, the Fischer and the Schrock carbenes. They are good σ donors like most tertiary phosphins, PR₃, but the π-bonding with the metal is rather weak. The thriving studies of NHC-coordinated metal complexes produced a wide range of applications from homogeneous catalysts to materials science

[en] We have synthesized the silver and copper complexes using the ligands, amine derivatives Ν-methylhydantoin amine, Ν-triethanol amine, the copper complexes are prepared depending on the equivalents of starting materials, however the silver complexes failed. In case of terephthalic acid, glutaric acid, we have synthesized silver and copper complexes successfully. We have measured conductivity of silver and copper complexes paste and ink themselves by thermal reduction using PULSE UV method. A couple of synthesized copper complex's paste have shown some resistance which is not enough for the conductive materials. Commercially silver pastes composed of silver oxide and silver salt of carboxylic acid, applied to the printed transistor circuits with suitable process, i. e. thermal reduction. This process substituted for electron beam brings a simplification of process, economical, environmental friendly process and a development of in the application of flexible substrate

[en] Highlights: • Silver(I) - corannulene complex has been proved using the ESI-MS method. • The structure of resulting complex has been determined applying quantum chemical DFT calculations. • The interaction energy of silver(I) - corannulene complex has been calculated. By using electrospray ionization mass spectrometry (ESI-MS), it was proven experimentally that the silver cation Ag⁺ forms with corannulene (C₂₀H₁₀) the cationic complex [Ag(C₂₀H₁₀)₂]⁺. Further, applying quantum chemical DFT calculations, the most probable structures of the [Ag(C₂₀H₁₀)₂]⁺ complex were derived. In the resulting complex the “central” cation Ag⁺, is located between two molecules of the corannulene ligand. Finally, the interaction energy, E(int), of the considered cation-π complex [Ag(C₂₀H₁₀)₂]⁺ was found to be −335.0 to −306.9 kJ/mol.

[en] A method is presented which allows reproducible measurements of the COOH functional group capacity in dilute extracts of soils, based on the use of the Ag⁺-TU complex as an index cation. The method is shown to be applicable to a podzol soil and leads to reliable values of the OM distribution coefficient, necessary in the evaluation of the importance of the OM sink of radionuclide binding. (author)

[en] Short note. 1 ref

[en] The thermodynamic parameters for the interaction of metal ions with dibenzo-16-crown-5 and its derivatives have been determined by solution calorimetry in methanol at 25 .deg. C. Thermodynamics properties of log K, ΔH, and TΔS have been determined for the complexation of metal cations by dibenzo-16-crown-5 and its derivatives. Dibenzo-16-crown-5 and its derivatives have been studied as metal cations carrier in bulk liquid membrane (BLM) and supported liquid membrane (SLM) system. Ag⁺ has been much more transported using dibenzo-16-crown-5 derivatives as carriers and several other metal cations have been small transported using carrier in BLM and SLM system. Ligand structure, the length of side arm, donor atom, stability constant, and carrier concentration are also important parameters in the transport of cations

[en] Silver tetrafluoroborate complex of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis (diphenylphosphino ylmethoxy) calyx [4] a rene (L) has been synthesized by reaction of silver tetrafluoroborate and L in dichloromethane at room temperature. The complex formed has a 1:1 metal/ligand ratio. ¹H and ³¹P NMR data support an encapsulated structure of the complex in which silver ion is located inside the hydrophilic cavity of the ligand