Byung-Soon Kim

Synthesis and Characterization of Quinoline-based Dye Sensor

Quinoline-based dye has been synthesized as a use of chemosensor for metal ions. The chemical structures and characteristics were determined by 1H-NMR, EA, Computational calculation and cyclic voltammetry. The detection properties of this dye chemosensor were examined and determined using UV-Vis spectroscopy. The prepared dye showed clear detection properties for Cu2+ and Zn2+. However, the sensing property between dye and Hg2+ ion was not observed. HOMO and LUMO energy levels were determined by computational calculation and electrochemical method.

Synthesis and Characterization of Benz-X-azole Based Dye Chemosensor

Concerns over heavy and transition metal ions such as copper, zinc and mercury are of topical interests because they are considered as highly toxic environmental pollutants. In this study, we have designed and synthesized new benz-X-azole derivatives as dye chemosensor and their selective and sensitive complex functions for heavy metal ion detection were investigated. Electron density distributions and HOMO/LUMO energy levels were computationally optimized. In addition, the formation type of metal binding complex was determined by Jobs plot measurements and cyclic voltammetry were conducted to determine comparison of the energy level potentials.

Polymethine Dye Synthesis and Its Leuco Property Investigation

Polymethine dyes have been synthesized using bis-dimethylaminophenylethylene compound. These dyes can be converted to the colorless leuco form by the treatment with alkali. Interestingly, these leuco dyes showed reversible color formation properties with following acid addition. The feasibility of the use as thermochromic indicator was investigated using bisphenol A and 1-hexadecanol.

Characterization of New Benz-X-Azole Dye Derivatives and Metal Complexes

Novel luminescence dyes having benzoxazole 3 and benzthiazole 4 moieties were synthesized and characterized. Zinc (II) complex dyes 5 and 6 were consecutively prepared and their corresponding light emitting properties were also studied with respect to the photoluminescence (PL) functions of the dyes 3 and 4 . The strong light emitting properties and their resulting PL spectra were observed from the dyes 3 and 5 , namely dyes having benzoxazole moieties. To expect the molecular conformation, theoretical modeling calculation were performed to determine the molecular interatomic distance and dihedral angle due to the limitation of single crystal formation from polymeric dye molecules.

Self-assembly Coloration Approach on Cotton Fibers using Porphyrin

In this work, poly(diallyldimethylammoniumchloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin were considered to produce the self-assembly fabrication films. This method is based on the layer-by-layer (LbL) deposition produced by the electrostatic attraction between positively charged PDDAC and negatively charged porphyrin ions. The result of multilayer fabrication was discussed with the level of color strength (K/S). K/S spectra of the fabricated multilayer films showed gradual increase behaviors. In addition, the color photo images of the fabricated multilayer films showed that PDDAC and porphyrin were successfully attracted by electrostatic self-assembly forces.

Multichromic Dye Synthesis and Its Absorption Properties with Cyclodextrins

The inclusion complex properties of the multichromic dye in DMSO with three different type of cyclodextrins, namely α-, β- and γ-cyclodextrin were studied by absorption spectra measurements. The first order fading rates were also calculated by decoloration properties of the three inclusion complex conditions. Futhermore, the inclusion complex of different sizes of cyclodextrins was compared, which showed the evident decoloration data for interaction of the multichromic dye and cyclodextrins.

Langmuir-Blodgett films containing carotenoid dye. II. Structure and conducting characteristics of ethyl β-apo-8-carotenoate/cadmium stearate LB films

The structure, doping, and electrical conductivity characteristics of ethyl β-apo-8-carotenoate dye (EA8C )/cadmium stearate Langmuir-Blodgett ( LB ) films were investigated. The EA8C/cadmium stearate mixed multilayer thin films, with the molar ratio of 1: 4, prepared at subphase pH 6, exhibited well-defined layered structures as determined by X-ray diffraction (XRD) spectra. The mixed LB films went ready doping upon exposure to iodine vapor or dipping in sulfuric acid solution. The UV/VIS and XRD data showed that the incorporated EA8C was thermally stable up to 80°C. The best conductivity characteristics were obtained with the iodine vapor. Thus, the mixed LB films exposed to iodine vapor showed in-plane and transverse conductivities of 10 -6 and 10 -7 -l0 -8 S/cm, respectively.