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Red Fluorescent Organic Light-Emitting Diodes Using Modified Pyran-containing DCJTB Derivatives
Lee, Kum-Hee,Kim, Sung-Min,Kim, Jeong-Yeon,Kim, Young-Kwan,Yoon, Seung-Soo Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
Two red fluorescent DCJTB derivatives (Red 1 and 2) based on modified pyrans were synthesized and their electroluminescent properties were investigated. Multilayered OLEDs were fabricated with the device structure of ITO/NPB (40 nm)/Red 1, 2 or DCJTB (0.5 or 1%): $Alq_3$ (20 nm)/$Alq_3$ (40 nm)/Liq (2 nm)/Al. All devices exhibited efficient red emissions. In particular, a device containing emitter Red 2 as a dopant in the emitting layer, the maximum luminance was $8737\;cd/m^2$ at 12.0 V, the luminous and power efficiencies were 2.31 cd/A and 1.25 lm/W at $20\;mA/cm^2$, respectively. The peak wavelength of the electroluminescence was 638 nm with the CIE (x,y) coordinates of (0.63, 0.36) at 7.0 V.
Red Fluorescent Organic Light-Emitting Diodes Using Modified Pyran-containing DCJTB Derivatives
Kum Hee Lee,Sung Min Kim,Jeong Yeon Kim,김영관,윤승수 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
Two red fluorescent DCJTB derivatives (Red 1 and 2) based on modified pyrans were synthesized and their electroluminescent properties were investigated. Multilayered OLEDs were fabricated with the device structure of ITO/NPB (40 nm)/Red 1, 2 or DCJTB (0.5 or 1%): Alq3 (20 nm)/Alq3 (40 nm)/Liq (2 nm)/Al. All devices exhibited efficient red emissions. In particular, a device containing emitter Red 2 as a dopant in the emitting layer, the maximum luminance was 8737 cd/m2 at 12.0 V, the luminous and power efficiencies were 2.31 cd/A and 1.25 lm/W at 20 mA/cm2,respectively. The peak wavelength of the electroluminescence was 638 nm with the CIE (x,y) coordinates of (0.63,0.36) at 7.0 V.
KUK, JU-HEE,MA, SEUNG-JIN,MOON, JAE-HAK,KIM, KIL-YONG,CHOI, SANG-HO,PARK, KEUN-HYUNG 한국미생물 · 생명공학회 2002 Journal of microbiology and biotechnology Vol.12 No.5
An antimicrobial compound was isolated from the MeOH extract of Catalpa ovata G. D_ON fruits, and its structure was identified as 4, 9-dihydroxy-2, 2-dimethyl-3, 4-dihydronaphtho[2, 3-b]pyran-5, 10-dione (HMNP). The antimicrobial activity of the HMNP was determined by measuring the dose-response inhibition of microbial growth in liquid cultures and then compared with that of lapachol, a well known antimicrobial 1, 4-naphthoquinone. The antimicrobial activity of the HMNP was more effective than that of lapachol over a wide range of test organisms. Gram-positive bacteria, yeast, and fungi (IC_50 20-75㎛) were found to be more sensitive to the HMNP than Gram-negative bacteria (IC_50>100㎛). The HMNP also inhibited germination of spores of many fungi. The morphological deformation of the fungal spores was induced by the treatment of HMNP, as illustrated by Scanning Electron Microscopy (SEM).
Kurls E. Anwer,Ahmed A. Farag,Eslam A. Mohamed,Eman M. Azmy,Galal H. Sayed 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
The present investigation aims to synthesize and explore the influence of pyridine and pyran derivativeson the API X-65 steel corrosion in a 6 M H2SO4 solution. The compound was examined at differentconcentrations to optimized the best concentration for the corrosion inhibition effect, weight lossmeasurements, potentiodynamic polarization measurement (PDP), electrochemical impedance spectroscopy(EIS), scanning electron microscopy (SEM) and theoretical methods were used to evaluating theinhibition efficiency. The obtained adsorption data achieved the model of Langmuir isotherm. Thepyridine derivatives showed higher inhibition than pyran derivatives. The PDP tests proposed thatpyridine and pyran derivatives are mixed-type inhibitors. The EIS parameters demonstrate that thedouble-layer capacitance (Cdl) decreases with the increase of inhibitor concentration, which implies areduces dielectric constant. It was observed from experimental data that the inhibition efficiency reached92.7%, 89.1, 94.7, and 85.2% for concentration 2.66 10 3M of I, II, III and IV, respectively indicating theinhibition order is III > I > II > IV. The parameters derived from the theoretical quantum chemicalcalculations were found adequately correlated with the obtained experimental results.
Kalla, Reddi Mohan Naidu,Varyambath, Anuraj,Kim, Mi Ri,Kim, Il Elsevier 2017 Applied Catalysis A Vol.538 No.-
<P><B>Abstract</B></P> <P>The hyper-crosslinked microporous polyphenanthrene spheres were fabricated simply by the polymerization of phenanthrene using bromomethyl methyl ether as a bridging agent in the absence of any templates. The organic spheres were subjected to amine-functionalizing on the periphery of them using unreacted bromomethyl groups. The amine-functionalized microporous polyphenthrene could be employed as a highly effective and stable solid basic catalyst for the syntheses of functionalized 2-amino-tetrahydro-4<I>H</I>-chromene and pyran derivatives. The significant features of these reactions are high product yields, environmental benignity, short reaction time, broad substrate scope, and non-requirement of toxic solvents. Furthermore, the catalyst can be reused up to four times without significant loss of activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Supported organo base-catalyzed syntheses of chromenes and pyrans are introduced. </LI> <LI> The reactions are eco-friendly, economically viable and versatile. </LI> <LI> The catalyst is reusable without losing its catalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jeong, Il-Min,Lim, Yoong-Ho,Ali, Mohd,Sultana, Shahnaz,Ahmad, Ateeque Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.7
Three new compounds orizaanthracenol (1-methoxyanthracen-2-ol, 1), 1-hydroxy-7-((2S,3R,4R,5S)-2'',3'',4''-trihydroxy-5''-(hydroxymethyl)tetrahydro-2H-pyran-1-yloxy)anthracen- 2-yl 3',7'-dimethyloctanoate (2) and 1-hydroxy-7-((2S,3R,4R,5S)-2'',3'',4''-trihydroxy-5''-(hydroxymethyl)tetrahydro-2H-pyran-1-yloxy)anthracen- 2-yl 3',7',11',15',19'-pentamethyltricosanoate (3) have been isolated and determined from the rice hulls of Oryza sativa. The structures of the compounds were elucidated using 1D and 2D NMR spectral methods, viz: 1H-NMR, 13C-NMR, DEPT, COSY and HSQC, and HMBC aided by IR, EIMS and FAB-MS. These isolated compounds were tested in bioassay on germination of radish to detect their inhibitory activities, in which compound 1 exhibited the most inhibition at the concentration of 40 ppm was 50.96% of total dry weight. Furthermore, germination and growth of radish were reduced by 27 to 48%, and dry weight of shoot and root were arranged from 50 to 52%, whilst compounds 2 and 3 exhibited weak inhibition than 1.
Ganapathy, Jagadeesan,Sivakumar, G.,Manickam, Bakthadoss,Sanmargam, Aravindhan The Basic Science Institute Chosun University 2015 조선자연과학논문집 Vol.8 No.1
In view of the growing medicinal importance of chromene and its derivatives, the single crystal X-ray diffraction study was carried out for the potential active 4,6-dimethyl-9-phenyl-8,12-dioxa-4,6-diazatetracyclo [8.8.0.02,7.013,18]octadeca-2(7),13,15,17-tetraene-3,5,11-trione-2-ethoxyphenyl (2E)-but-2-enoate ($C_{18}H_{20}N_2O_5$). In the title compound are two molecules exist in the asymmetric unit. It crystallizes in the monoclinic space group $P2_1/c$ with unit cell dimension a=14.608(3) ${\AA}$, b=12.845(3) and c= 17.781(4) [alpha & gamma=$90^{\circ}$ beta=$91.233(5)^{\circ}$]. Both pyran and pyran ring of the chromene moiety adopts sofa conformation in the molecule A & B. The crystal structure is stabilized by intramolecular C-H...O hydrogen bond interaction.
A. F. M. Motiur Rahman,Jing Lu Liang,이승호,손종근,정미자,장영동,권영주 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.9
The 2,2-dimethyl-2H-pyran-derived alkaloids acronycine and its demethylated congeners were prepared in three steps from anthranilic acid and phloroglucinol. The phenylboronic acid-mediated interamolecular cyclization reaction of 1,3-dihydroxyacridone and 3-methylbut-2-enal was employed as a key step, which was also applied to the synthesis of related cytotoxic benzo[b]acronycine. Inhibitory activities of the compounds prepared on topoisomerase I and II as well as their cytotoxicities were evaluated. Cytotoxicity of 2 is closely related to the strong inhibitory activity against topo II at 20 μM level.
Rahman, A.F.M. Motiur,Liang, Jing Lu,Lee, Seung-Ho,Son, Jong-Keun,Jung, Mi-Ja,Kwon, Young-Joo,Jahng, Yurng-Dong 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.9
The 2,2-dimethyl-2H-pyran-derived alkaloids acronycine and its demethylated congeners were prepared in three steps from anthranilic acid and phloroglucinol. The phenylboronic acid-mediated inter-amolecular cyclization reaction of 1,3-dihydroxyacridone and 3-methylbut-2-enal was employed as a key step, which was also applied to the synthesis of related cytotoxic benzo[b]acronycine. Inhibitory activities of the compounds prepared on topoisomerase I and II as well as their cytotoxicities were evaluated. Cytotoxicity of 2 is closely related to the strong inhibitory activity against topo II at $20{\mu}M$ level.