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Energy transfer from the excited ( 3* D) metal-to-ligand-charge-transfer triplet state ( 3* MLCT) to selected organic energy acceptor quenchers (A) has been investigated for Ir(ppy) 3 –chrysene and Ru(bpy) 32+ –pyrene systems at different temperatures in several organic solvents. For both systems studied, reversible, nearly iso-energetic energy transfer processes...
A series of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD) samples, characterized by different cis/trans ratio of the 1,4-cyclohexanedicarbonyl units, and a PCCD ionomer, containing 3mol% of ionic terminal groups, were exposed to accelerated UV in order to study the molecular modifications occurring during the ageing period and correlate them to the initial macromolecular structure...
Ultrafast pump-probe spectroscopy (λ pump =320nm) was applied to study the primary photochemical processes for IrCl 62− complex in aqueous and methanol solutions. The excitation to the mixed LMCT and d–d states was followed by formation of an intermediate absorption completely decaying with the characteristic time of 20–30ps. The almost complete recovery of the ground state is...
The efficient organic dyes 2-{4-[2-(2-hydroxybenzylidene)hydrazino]phenyl}ethylene-1,1,2-tricarbonitrile and 2-{4-[2-(4-hydroxybenzylidene)hydrazino]phenyl}ethylene-1,1,2-tricarbonitrile have been synthesized, characterized and fabricated as hetero-junction solar cell materials. We use B3LYP/6-31G*, B3LYP/6-31G** and HF/6-31G** level of theories to optimize the ground state geometries. The absorption...
One of the most important applications of nanostructured TiO 2 is the manufacture of self-cleaning textiles. It is believed that the self-cleaning properties originate from the photocatalysis of water by nanostructured TiO 2 , but the mechanisms acting on textiles, and particularly the phenomena occurring at the interface, are not fully understood yet. A comparative study is proposed...
1-(4-acetyl-phenyl)-3-(4-N,N-dimethylaminophenyl)-thiourea is synthesized and characterized by NMR, IR, MS and elemental analysis. The probe exhibits the “turn-off” fluorescence response to iodide anion in THF/H 2 O (v/v=9/1) pH=7.4 Tris–HCl buffer solution, which is attributed to the intramolecular charge transfer (ICT). It is found that the probe has a detection limit of 0.336μM. Such interesting...
Two highly fluorinated Er 3+ complexes with three 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate (fod) groups and either bipyridine (bipy) or bathophenantholine (bath) as the ancillary ligand emitting at the C-band (third communication window for fiber transmission) are presented. These complexes are the result of a design process aimed at decreasing the vibrational quenching from...
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