Kun Jun

2-ARYLBENZOXAZOLES FROM PHENOLIC SCHIFF'S BASES BY THIANTHRENE CATION RADICAL

Abstract 2-Arylbenzoxazoles 2 have been made in 91–97% yields from phenolic Schiffs bases 1 by thianthrene cation radical perchlorate (Th +. ClO 4 − ) in the presence of 2,6-di- tert -butyl-4-methylpyridine.

One step synthesis of 4-ethoxy-1,2,3,4-tetrahydroquinoline from nitroarene and ethanol: A TiO2 mediated photocatalytic reaction

Abstract 4-Ethoxy-1,2,3,4-tetrahydroquinoline is formed in a one pot reaction from a heterogeneous solution of nitroarene, ethanol, and TiO 2 by UV light ( λ =350 nm).

Electrochemical Studies on Heptamethine Cyanine Dyes

Computational calculations of molecular orbital and electrochemical redox/oxidation potentials are of very importance to determine the compound properties. The energy levels of molecular orbital were calculated by the density function theory (DFT) with exchange correction functional of local density approximation (LSA) based on the Perdew-Wang (PWC) setting and cyclic voltammetry.

s-Triazolo[3,4-α]Phthalazines From 1-Phthalazinylhydrazones by Thianthrene Cation Radical Perchlorate

Abstract 1-Phthalazinylhydrazones 4 gave i,-triazolo[3,4-a]phthalazines 5 in 94-98% yields by thianthrene cation radical perchlorate (Th+′C104 -).

Novel photocatalytic product from m-nitrocinnamic acid and alcohol mediated by TiO2

Abstract New heterocycles 6 having a skeleton of 7-membered lactone and a 1,2,3,4-tetrahydroquinoline were obtained from TiO2 suspended alcoholic solution of trans m-nitrocinnamic acid 4 by uv (350 nm) irradiation. Highly functionalized products 6 are believed to be formed through 4-alkoxy-1,2,3,4-tetrahydroquinolines 5.

Adsorption of Azothiophene Dye Having an N-Bridging Bidentate Tail Group on Gold

The novel azothiophene derivatives [AT-di(CnSAc) (n=6 and 12)], an azo linkage (N=N) that bridges one phenyl ring with an N-bridging dialkylthioacetate tail and one thiophene ring, are synthesized and characterized. The azothiophene derivatives substituted with electron-withdrawing groups are blue in color, exhibit a bathochromic shift of a longer wavelength, and are electrochemically active. The formation and characterization of AT-di(CnSAc) SAMs with a bidentate tail group of the N-bridging dialkylthioacetate have been studied by surface sensitive techniques such as grazing angle Fourier transform infrared (FT-IR), a quartz crystal microbalance (QCM), spectroscopic ellipsometry, X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). It has been shown that the adsorption reaction of the thioacetate group is almost spontaneous and the N-bridging dialkylthioacetate SAMs with longer methylene length have a packing density higher than that with a shorter methylene length. However, the sulfur tethers of the N-bridging dialkylthioacetate show incomplete binding of sulfur atoms in AT-di(CnSAc) SAMs.

Synthesis of Rhodamine-based Chemosensor and Determination of Spectral Properties

A rhodamine-based fluorescent chemosensor (Rh6G-2HC) was synthesized easily by a one-step condensation reaction. The structure was characterized using NMR, MS and EA spectroscopies. As soon as Cu2+ was added into the chemosensor solution, a color change from colorless to pink color was observed, and a considerable change in the absorption and fluorescence spectra. However, no spectral changes were indicated for other heavy metals such as Ag+, Zn2+, Cd2+, and Co2+. In order to provide a more detailed metal sensing performance, the optical and structural properties for the Cu2+ sensing effect were investigated using UV-Vis, fluorescence and H-NMR spectroscopies.

Synthesis, Optical, Electrochemical and Theoretical Studies of New Multicyclic Substituted Phthalocyanines

Here novel phenanthrenoxy and pyrenoxy substituted phthalocyanines were synthesized and fully characterized by general spectroscopic methods such as elemental analysis, 1H NMR, MALDI-TOF, FT-IR, UV-Visible absorption. The aggregation property of these phthalocyanines was investigated in CHCl3 and Triton X. Furthermore, electrochemical and DFT calculations were performed for these molecules.