• Title/Summary/Keyword: $^1H-NMR$ Spectrum

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In vitro and in vivo antifunal activaties of derivatives of thymol( I ) and carvacrol(II) againt phytopathogenic fungi (Thymol과 Carvacrol 유도체들의 합성과 식물병원균에 대한 항균활성)

  • Choi, Won-Sik;Jung, Chan-Jin;Jang, Do-Yun;Cha, Kyoung-Min;Um, Dae-Yong;Kim, Tae-Jun;Jung, Bong-Jin
    • The Korean Journal of Pesticide Science
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    • v.10 no.4
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    • pp.237-248
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    • 2006
  • Forty one compounds such as ester, sulfonyl ester, carbamate, ether and phosphoyl ester derivatives of thymol(I) and carvacrol(II) were synthesized. These derivatives were identified by IR, GC/MS and $^1H$-NMR spectra. Their antifungal activities were tested against various plant pathogenicfugi. Among them, several compounds were showed potent in vivo antifungal activities. The selected compounds showing in vitro antifungal activities were tested in vivo antifungal activities aganint 5 plant diseases such as rice blast, rice sheath blight, tomato late blight, cucumber anthracnose, and cucumber gray mold. As a result, 2-isopropyl-5-methylphenylacetate(I-1a) effectively suppressed the development cucumber gray mold and rice blast. Methyl(2-isopropyl-5-methylphenoxy)acetate(I-6d) and ethyl 4-(5-methyl-2-isopopylphenoxy)crotonate(I-7d) also showed potent in vivo antifungal actively againt rice sheath blight and tomato late blight, respectively.

Synthesis and Anti-corrosion Properties of Succinic Acid Alkyl Half-Ester Derivatives (숙신산 알킬 하프-에스테르 유도체의 합성 및 해수에 대한 방청성능)

  • Baek, Seung-Yeob;Kim, Young-Wun;Chung, Keun-Wo;Yoo, Seung-Hyun
    • Applied Chemistry for Engineering
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    • v.22 no.4
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    • pp.367-375
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    • 2011
  • Succinic acid ester derivatives have been used as additives for the base oil of metal working fluids and pressure working oils. In this paper, a series of succinic acid alkyl half-esters were synthesized with over 97% yields by ring-opening reaction of succinic anhydride and fatty alcohol and were soluble in 100 N base oil within 1 wt% concentration. The structures and purities of ester derivatives were confirmed by $^1H-NMR$ and FT-IR spectrum and GC analysis. Anti-corrosion properties of the esters in sea water were evaluated through ASTM D665 method and weight loss method and compared to that of succinic alkyl esters without carboxylic acid group in the molecule. As the results, anti-corrosion properties of succinic acid alkyl half-esters with carboxylic acid group were better than those of succinic acid alkyl esters without carboxylic acid group. And, Anti-corrosion properties of the esters with a shorter alkyl chain of high concentration showed better performance than those with longer alkyl chain of low concentration. Inhibition efficiency % (IE%) of the esters was over 95% in the concentration of 80 ppm and corrosion rate (CR) was below 0.3 mm/year at the same concentration. Thus, the corrosion properties of succinic acid alkyl half-esters result from the carboxylic acid groups in molecules.

Structure and Chemical Reactivity of the Transition Metal Complexes (I). Synthesis and Geometrical Isomerism of the Ethylenediamine-triacetatocobalt (III) Complexes with Ammine or Diamines (전이금속착물의 구조와 그 반응성 (I). 암민류를 포함하는 Ethylenediamine-triacetatocobalt (III) 착물의 합성과 기하이성질현상)

  • Dong-Jin Lee;Bong-Gon Kim;Myung-Ki Doh
    • Journal of the Korean Chemical Society
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    • v.29 no.5
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    • pp.516-521
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    • 1985
  • Ethylenediamine-triacetatocobalt (III) complexes with an ammine, an ethylene-diamine, and a trimethylenediamine as the unidentate ligand were prepared, and were isolated as only one isomer for each case by the Dowex 50W-X8, cation exchange resin in $H^+$ form. The geometrical isomer of these complexes have been assigned cis-equatorial form in the three possible geometrical isomers from the elemental analysis, pH titration, IR, NMR, and electronic absorption spectrum. It was found that $[CoN_3O_3]$ system of the meridional form with multidentate ligand have the first absorption band of the largely splitting pattern, and that the diamines (ethylenediamine, trimethylenediamine) have coordinated to the central cobalt (III) ion as a unidentate ligand.

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Study on Chemical Stabilities with R-1234yf Refrigerant of Polyol Ester Refrigerant Oil for Electric Vehicles (전기 자동차용 폴리올 에스테르계 냉동기유의 R-1234yf 냉매와의 적합성 연구)

  • Hong, J.S.;Chung, K.W.;Kim, N.K.;Shin, J.H.;Kim, Young Woon;Lee, E.H.;Go, B.S.;Hwang, S.Y.
    • Tribology and Lubricants
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    • v.36 no.3
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    • pp.139-146
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    • 2020
  • Global warming has led to an increase in demand of eco-friendly vehicles, such as electric cars, for reducing greenhouse gas emissions, and especially, regulating carbon dioxide generation. In addition, electric vehicles are equipped with an electric drive-type hermetic scroll compressor and a refrigerant, which exhibit current and future trends of using environmentally friendly refrigerants, including R-1234yf. In this study, polyol ester-based refrigeration oils are prepared via condensation esterification of polyol and fatty acids. The oils can be combined with R-1234yf refrigerant for applications in air conditioning and cooling systems of electric vehicles. The structure of synthetic polyol esters is confirmed via 1H-NMR and FT-IR spectrum analysis, and the composition of the polyol ester is analyzed via gas chromatogram analysis. Furthermore, kinematic viscosity, viscosity index, total acid value, pour point, and color are analyzed as fundamental physical properties of the synthetic polyol esters. The compatibility and chemical stability of the synthetic polyol ester combined with the R-1234yf refrigerant are obtained via high temperature and high pressure oil-resistant refrigerant tests. The changes in the oil color and catalyst activity are observed before and after the experiment to determine whether it is suitable as a refrigerator oil.

A Study on the Molecular Weight Control and Rheological Properties of Branched Polycarbonate (분지형 폴리카보네이트의 분자량 조절 및 유변학적 특성 연구)

  • Lee, Bom Yi;Dahal, Prashanta;Kim, Hee Seung;Yoo, Seung Yoon;Kim, Youn Cheol
    • Applied Chemistry for Engineering
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    • v.23 no.4
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    • pp.388-393
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    • 2012
  • Branched polycarbonates (B-PCs) were synthesized using melt polymerization method with four different end capping agents and vaying concentrations. The chemical structure of the synthesized PC was determined by FT-IR and $^{1}H-NMR$ spectroscopy, and the reaction of the end capping agent was confirmed by the existence of hydroxy group in FT-IR spectrum. The average molecular weight and distribution, glass transition and degradation temperatures were determined by GPC, DSC and TGA. The average molecular weight changed with the chemical structure of end capping agent, and 4-tert-butylphenol was estimated as the optimum end capping agent. The average molecular weights of B-PCs decreased with the increase of the concentration of the agent, the number average molecular weight represented 20000 when 0.05 mol% of 4-tert-butylphenol was added to B-PCs. The melt viscosities of the B-PCs decreased with the decrease of the molecular weight of B-PCs, and adding of the agent was not effected to shear thinning tendency.

Preparation and Characterization of Swallow-Tail Terrylene Bisimide as Organic Phosphor (Swallow-Tail Terrylene Bisimide 적색 유기 형광체 제조 및 특성 연구)

  • Jung, Sung Bong;Jeong, Yeon Tae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.33 no.3
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    • pp.194-200
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    • 2020
  • Perylene bisimide derivatives are developed for red organic phosphor because of their advantages, such as excellent luminous efficiency and high thermal stability. Despite these advantages, they have poor solubility characteristics in organic solvents and short emission wavelength as red organic phosphor for hybrid light-emitting diodes (LEDs). In this study, we prepared terrylene bisimide using a coupling reaction and swallow-tail imide group, which has excellent solubility. The structures and properties of swallow-tail terrylene bisimide (9C) were analyzed using 1H-nuclear magnetic resonance (1H-NMR), Fourier-transform infrared (FT-IR), UV/Vis spectroscopy, and thermal gravimetric analysis (TGA). The maximum absorption wavelength of (9C) in the UV/Vis spectrum was 647 nm, and the maximum emission wavelength was 676 nm. In the TGA, (9C) demonstrated good thermal stability with less than 5 wt% weight loss up to 415℃. In the solubility test, (9C) has a good solubility of more than 5 wt% in chloroform and dichloromethane. When the compounds (9C) were mixed with PMMA (polymethly methacrylate), the films showed peaks at 680 nm in the PL spectra. The results verify the suitability of (9C) as a red organic phosphor for hybrid LEDs.

Biodegradation of Aniline by Pseudomonas putida FW (Pseudomonas putida FW에 의한 Aniline의 생물학적 분해)

  • Park, Y.K.;Oh, J.S.;Ban, C.I.;Yoon, S.J.;Choi, M.S.
    • Microbiology and Biotechnology Letters
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    • v.16 no.5
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    • pp.413-420
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    • 1988
  • The strain capable of growing on minimal medium containing aniline as a sole source of carbon was isolated from activated sludges and identified as Pseudomonas putida biotype A. The characterizations of the strain were determined. The optimum concentration for growth of the strain was 1-20 mM of aniline. No changes of pH were detected during cultivation. Some metabolic products of biodegradation of aniline were detected after cultivation of the strain on 10 mM aniline for 48 hours. The strain showed to be resistant to streptomycin, tetracycline, trimethoprim, and sulfanilamide. The strain was also capable of utilizing other aromatic compounds related to aniline as a sole source of carbon. One plasmid carried by this strain was detected. The properties of some of the mutant strains treated with mitomycin C were also discussed. The results suggest that separate, regulatory enzyme systems capable of degrading aniline may exist in plasmid DNA.

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Synthesis and Characterization of Red Organic Phosphor for Hybrid LED (Hybrid LED용 적색 유기형광체의 합성 및 특성 연구)

  • Lee, Seung Min;Jeong, Yeon Tae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.1
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    • pp.48-53
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    • 2017
  • We report the studies on the red organic phosphor by using perylene bisimide derivatives. Even though perylene bisimide derivatives have excellent thermal stability and luminous efficiency, they have low solubility in organic solvents. In this research, modified perylene bisimide derivative, N,N'-Bis(4-bromo-2, 6-diisopropylphenyl)-1, 6, 7, 12-tetraphenoxyperylene-3, 4, 9, 10-tetracarboxyl bisimide (1C), has been prepared by the reaction of phenol with N,N'-Bis(4-bromo-2, 6-diisopropylphenyl)-1, 6, 7, 12-tetrachloroperylene-3, 4, 9, 10-tetracarboxyl bisimide (1B) in presence of DMF, at $70^{\circ}C$. The synthesized (1C) was characterized by using $^1H-NMR$, FT-IR, UV/V is spectroscopy, and TGA. The absorbtion and emission of (1C) was shown at 576 nm and 610 nm in UV/V is spectrum. In TGA thermogram, (1C) showed good thermal stability without significant weight loss to $220^{\circ}C$. And in the solubility analysis, (1C) with phenoxy group showed the good solubility in general organic solvents. The blended films of (1C) with PMMA (polymethyl methacrylate) at different weight % concentration such as 10, 5, 1 weight % have been prepared. The blended film was shown at 616 nm when monitored at 450 nm in PL emission spectra.

Antifungal activities for derivatives of 4-isopropyl-3-methylphenol and 5-isopropyl-3-methylphenol against plant pathogenic fungi (4-Isopropyl, 5-isopropyl-3-methylphenol 유도체들의 합성과 식물 병원균에 대한 항균 활성)

  • Choi, Won-Sik;Jang, Soon-Ho;Jang, Do-Yeon;Choi, Kyoung-Gil;Lee, Byung-Ho;Kim, Tae-Jun;Jung, Bong-Jin
    • The Korean Journal of Pesticide Science
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    • v.10 no.4
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    • pp.249-261
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    • 2006
  • Fifty compounds such as ester, sulfonyl ester, carbamate, ether and phosphoyl ester derivatives of 4-isopropyl-3-methylphenol(I) and 5-isopropyl-3-methylphenol(II) were synthesized. These derivatives were identified by IR, GC/MS and $^1H$-NMR spectra. Their in vitro antifungal activities were tested against 10 plant pathogenic fungi. Among them, several compounds showed potent in vitro antifungal activity. The selected compounds showing potent in vitro antifungal activity were tested for their in vivo antifungal activities against 5 plant diseases such as rice blast, rice sheath blast, cucumber anthracnose, cucumber gray mold and tomato late blight. As a result, 4-isopropyl-3-methylphenyl(2-amino-thiazole-4-yl)methoxyiminoacetate(I-7a) showed a potent in vivo antifungal activity against rice blast. Both methyl (4-isopropyl-3-methylphenoxy)acetate(I-4d) and methyl (5-isopropyl-3-methylphenoxy)acetate(II-4d) effectively inhibited the development of cucumber gray mold.

Production of a New Biosurfactant by a New Yeast Species Isolated from Prunus mume Sieb. et Zucc.

  • Jeong-Seon Kim;Miran Lee;Dae-Won Ki;Soon-Wo Kwon;Young-Joon Ko;Jong-Shik Kim;Bong-Sik Yun;Soo-Jin Kim
    • Journal of Microbiology and Biotechnology
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    • v.33 no.8
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    • pp.1023-1029
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    • 2023
  • Biosurfactants reduce surface and interfacial tension due to their amphiphilic properties and are an eco-friendly alternative for chemical surfactants. In this study, a new yeast strain JAF-11 that produces a biosurfactant was selected using drop collapse method, and the properties of the extracts were investigated. The nucleotide sequences of the strain were compared with closely related strains and identified based on the D1/D2 domain of the large subunit ribosomal DNA (LSU) and internal transcribed spacer (ITS) regions. Neodothiora populina CPC 39399T, the closest species with strain JAF-11, showed a sequence similarity of 97.75% for LSU and 94.27% for ITS, respectively. The result suggests that the strain JAF-11 represents a distinct species that cannot be assigned to any existing genus or species in the family Dothideaceae. Strain JAF-11 produced a biosurfactant reducing the surface tension of water from 72 mN/m to 34.5 mN/m on the sixth day of culture and the result of measuring the critical micelle concentration (CMC) by extracting the crude biosurfactant was found to be 24 mg/l. The molecular weight 502 of the purified biosurfactant was confirmed by measuring the fast atom bombardment mass spectrum. The chemical structure was analyzed by measuring 1H nuclear magnetic resonance (NMR), 13C NMR, and two-dimensional NMRs of the compound. The molecular formula was C26H46O9, and it was composed of one octanoyl group and two hexanoyl groups to myo-inositol moiety. The new biosurfactant is the first report of a compound produced by a new yeast strain, JAF-11.