bluuebunny/crossref_metadata_2025_split huggingface dataset:
Silicon Carbide Nanostructures from Reactions between Vapors of Organochlorosilanes and Liquid of Sodium‐Factors Affecting Morphology and Composition
Authors: Wang Chia‐Hsin , Liu Wen‐Chih , Lee Chi‐Young , Chiu Hsin‐Tien 
Published: May 2015

AbstractCubic shells and spherical nanoparticles of β‐SiC were produced at 1273 K by processing the ceramic precursors formed from the reactions between vapors of organochlorosilanes, Me2SiCl2, MeSiCl3, MeSiHCl2, and PhSiCl3, and liquid Na at 523‐723 K. From Me2SiCl2, a flexible linear polycarbosilane precursor was synthesized and covered the NaCl byproduct surface to form a cubic shape. Hollow cubic β‐SiC shells were produced after the NaCl templates were removed. From MeSiCl3, a rigid cross‐linked polycarbosilane was produced and phase segregated from the NaCl byproduct. The precursor was transformed into nanoparticles without special morphology. MeSiHCl2 produced a cross‐linked polysilane precursor at low temperatures, which can be converted into a mixture of β‐SiC and Si nanoparticles. At high temperatures, the polysilane converted to polycarbosilane and produced hollow cubic β‐SiC shells. The carbon‐rich PhSiCl3 generated cube‐like particles as the final product, which contained β‐SiC and carbon.
Properties of Poly(Vinyl Alcohol)‐Based Composite Membranes for Direct Methanol Fuel Cell Applications
Authors: Gao Tong‐Zhai , Kandel Bishnu Sharma , Oh Sae‐Joong 
Published: May 2015

AbstractThe feasibility of poly(vinyl alcohol)(PVA)/sulfosuccinic acid(SSA)/heteropolyacid (HPA) composite membranes was investigated to apply for direct methanol fuel cells (DMFC). The composite membranes were prepared by the solution casting method and their properties were examined. The FTIR spectra showed that the Keggin unit of HPA was preserved in the composite membranes and that specific interactions were involved between PVA and HPA. The composite membranes showed uniform distribution of PWA particles in the PVA/SSA/PWA composite membranes by FE‐SEM. The HPA bleeding out was observed to decrease with increasing HPA concentration. The proton conductivity of PVA/SSA/HPA composite membranes improved at low HPA concentration (5‐10 wt.%), while those properties decreased as HPA concentration increased over 10 wt.%.
Kinetic Spectrophotometric Determination of Metoprolol Tartrate in Commercial Dosage Forms
Authors: Rahman Nafisur , Haque Sk Manirul , Azmi Syed Najmul Hejaz 
Published: May 2015

AbstractA kinetic spectrophotometric method has been described for the determination of metoprolol tartrate in commercial dosage forms. The procedure is based on the reaction of the drug with 1‐chloro‐2, 4‐dinitrobenzene (CDNB) in dimethylsulfoxide (DMSO) at 100 ± 1 °C. The reaction is investigated by measuring the change in absorbance with time at 420 nm. Fixed‐time (ΔA) and equilibrium methods are chosen for obtaining the calibration curves. Both calibration curves were found to be linear over the concentration range of 5‐60 μg mL−1. The regression analysis of calibration data resulted in the linear regression equations of ΔA = −1.608 × 10−4 + 3.96 × 10−3 C and A = 7.31 × 10−4 + 1.90 × 10−2 C for fixed time (ΔA) and equilibrium methods, respectively. The limit of detection (LOD) for fixed time and equilibrium methods are 1.16 and 0.415 μg mL−1, respectively. The method has been successfully applied to the quantitation of metoprolol tartrate in commercial dosage forms. Statistical comparison of the results shows that there is no significant difference between the proposed methods and El‐Ries's spectrophotometric method.
Kinetic‐Spectrophotometric Determination of Metronidazole Benzoate in Surfactant Medium
Authors: Farhadi Khalil , Bahar Shahriyar 
Published: May 2015

AbstractA kinetic method for the accurate and sensitive determination of metronidazole benzoate (MB) has been described. The method is based on the oxidation of MB with KMnO4 in alkaline medium in the presence of sodium dodecyl sulphate (SDS). At a fixed time of 10 min, the formed magnate ion is spectrophotometrically measured at 610 nm. The determination of MB by the fixed‐concentration and rate constant method is feasible with the calibration equation obtained, but the fixed‐time method proves to be more applicable. The proposed method was successfully used for the quantitative determination of MB in suspended oral syrup after the separation of MB with a simple separation method. Beer's law was obeyed from 0.55 mgL−1 to 33 mgL−1 and the RSD% value for syrup was 3.44. The results obtained agreed with those obtained by the BP method.
Synthesis of Important New Pyrrolo[3,4‐c]Pyrazoles and Pyrazolyl‐Pyrrolines from Heterocyclic β‐Ketonitriles
Authors: Amer Fathy Abdel‐Kader , Hammouda Metwally , El‐Ahl Abdel‐Aziz Sayed , Abdel‐Wahab Bakr Fathy 
Published: May 2015

AbstractTreatment of heterocyclic β‐ketonitriles 1a,b with hydrazine hydrate and phenylhydrazine afforded the hydrazine derivatives 2a‐d which cyclized in PPA into pyrrolo[3,4‐c]pyrazoles 3a‐d. Reaction of 1a,b with cyanoacetohydrazide furnished the cyanoacetyl pyrrolo[3,4‐c]pyrazoles 4a,b. The hydrazine 2c reacted with β‐diketone and β‐ketoesters to afford pyrazolyl‐pyrrolines 5‐7. Also the later hydrazine reacted with some D‐aldoses and aceteophenone to give the corresponding hydrazones 10‐12 and hydrazine carboxamide derivatives 15a,b respectively.
Stabilization Studies on Divalent Five‐Membered Rings C4H4C, C4H4Si, C4H4Ge, C4H4Sn, and C4H4Pb
Authors: Vessally E. , Rezaei A. , Chalyavi N. , Nikoorazm M. 
Published: May 2015

AbstractEnergy differences, ΔXS‐t (X = E, H and G) (ΔXS‐t = X(singlet)‐X(triplet)) between singlet (s) and triplet (t) states are calculated at B3LYP/6‐311++G (3df,2p). The DFT calculations show that the triplet state of C4H4C is a ground state with planar conformer respect to its corresponding nonplanar singlet state. Both singlet and triplet states of C4H4M (M = Si, Ge, Sn and Pb) have a planar conformer with the singlet ground state. Four isodesmic reactions are presented for determining the stability energies, SE. NICS calculations are carried out for C4H4M to determine the aromatic character.
Steroselective Hydrolysis of DL‐Beta‐Acetylthioisobutyramide Catalyzed by Genetically Engineered E. Coli Immobilized on Celite 580 in a Packed Bed Bioreactor
Authors: Shaw Shyh‐Yu , Chen Yu‐Jen , Ou Jung‐Jung , Ho Lewis 
Published: May 2015

AbstractPseudomonas putida IFO12996 catalyzes the stereoselective hydrolysis of methyl dl‐β‐acetylthioisobutyramide (dl‐ATIA) to form d‐β‐acetylthioisobutyric acid (DAT), a key intermediate for synthesis of a series of angiotensin converting enzyme inhibitors. The esterase gene of Pseudomonas putida IFO12996 was cloned and expressed in Escherichia coli which was further immobilized and retained on a packed bed bioreactor filled with Celite 580. The packed bed bioreactor was used to conduct the stereoselective hydrolysis of dl‐ATIA and to give DAT with a yield of 34.5%, enantiometric excess value of 97% and enantioselectivity value > 150. The optimal pH and temperature for the reaction were 9.0 and 57 °C ∼ 67 °C, respectively. The kinetic constants (Km and Vmax) of immobilized cells were found to be 372.5 mM and 285.7 μmol min−1 (g cell)−1, respectively. The immobilized cells retained over 60% of the initial catalytic activity after 5 batch cycles of production.This paper presents a simple, practical and economical process of immobilization of genetically engineered E. coli on a novel packed bed bioreactor for production of DAT.
N,N,N′,N′‐Tetraalkylaminoazoxybenzene Derivatives; Convenient Synthesis and Mechanistic Study
Authors: Lai Long‐Li , Chang Yi‐Ging , Hsu Hui‐Chu , Hsu Shun‐Ju , Luo Dao‐Wen 
Published: May 2015

AbstractN,N,N′,N′‐tetraalkyaminoazoxybenzene derivatives were conveniently prepared by the coupling of N,N‐dialkylnitrosoaniline in the presence of acetone and KOH. The reaction mechanism was proposed and investigated, and the structure of compound 3b was also confirmed by single crystal X‐ray diffractometry.
BF3‐Oet2/Et3SiH‐Mediated Rearrangement of 4‐Aryl‐5,5‐Diphenylazapan‐4‐Ols
Authors: Chang Meng‐Yang , Kung Yung‐Hua , Chen Shui‐Tein 
Published: May 2015

AbstractSynthesis of 2‐(2‐arylethyl)‐3,3‐diphenylpyrrolidines has been established starting from different 4‐aryl‐5,5‐diphenylazepan‐4‐ols via boron trifluoride etherate/triethylsilane‐mediated rearrangement.
Metal‐Sensitive Hydrothermal Synthesis and Structural Characterization of a Mixed‐Metal and Porous Coordination Polymer Containing 2,3‐Pyridinedicarboxylate
Authors: Yen Chia‐Hung , Liao Fen‐Ling , Shiu Kom‐Bei 
Published: May 2015

AbstractThe hydrothermal reaction of 2,3‐pyridinedicarboxylic acid (2,3‐H2pda) with a mixture of Cd(NO3)2 and Ni(NO3)2 afforded a coordination polymer, [CdNi(2,3‐pda)2(H2O)3]∞ (1); in contrast, that with a mixture of Cd(NO3)2 and Zn(NO3)2 surprisingly produced a discrete molecule, trans‐[Cd(3‐pa)2(H2O)4] (2) (3‐pa− = 3‐pyridinecarboxylate). Since a direct reaction between a single metal salt, Cd(NO3)2 or Zn(NO3)2, and 3‐pyridinecarboxylic acid (3‐Hpa) under similar hydrothermal conditions yielded different coordination polymers containing 3‐pa−, it appears that the apparently thermal decarboxylation from ligated 2,3‐pda2− to 3‐pa− occurs after complexation of both metal cations, Cd(II) and Zn(II). A new coordination mode, formed for 2,3‐pda2− in structure 1, appears to help formation of microporous channels by piling up the observed 2D hydrogen‐bonded heteropolynuclear layers. Each channel apparently consists of two interpenetrating 63 Cd(II) and Ni(II) nets.
Removal of Zn(II) Ions from Aqueous Solution Using BPHA‐Impregnated Polyurethane Foam
Authors: Ahmad Rashid , Ahmed Munir 
Published: May 2015

AbstractZn(II) ions sorption onto N‐Benzoyl‐N‐Phenylhydroxylamine (BPHA) impregnated polyurethane foam (PUF) has been studied extensively using radiotracer and batch techniques. Maximum sorption (∼98%) of Zn(II) ions (8.9 × 10−6 M) onto sorbent surface is achieved from a buffer of pH 8 solution in 30 minutes using 7.5 mg/mL of BPHA‐impregnated polyurethane foam at 283 K. The sorption data follow Langmuir, Freundlich and Dubinin‐Radushkevich (D‐R) isotherms. The Langmuir constants Q = 18.01 ± 0.38 μ mole g−1 and b = (5.39 ± 0.98) × 103 L mole−1 have been computed. Freundlich constants 1/n = 0.29 ± 0.01 and Cm = 111.22 ± 12.3 μ mole g−1 have been estimated. Sorption capacity 31.42 ± 1.62 μ mole g−1, β = −0.00269 ± 0.00012 kJ2 mole−2 and energy 13.34 ± 0.03 kJ mole−1 have been evaluated using D‐R isotherm. The variation of sorption with temperature yields ΔH = −77.7 ± 2.8 k J mole−1, ΔS = −237.7 ± 9.3 J mole−1 K−1 and ΔG = −661.8 ± 117.5 k J mol−1 at 298 K reflecting the exothermic and spontaneous nature of sorption. Cations like Fe(III), Ce(III), Al(III), Pb(II) and Hg(II) and anions, i.e., oxalate, EDTA and tartrate, reduce the sorption significantly, while iodide and thiocyanate enhanced the sorption of Zn(II) ions onto BPHA‐impregnated polyurethane foam.
New Phenol Glycosides from the Roots of Rhus Javanica var. Roxburghiana
Authors: Ouyang Ming‐An , Chang Chi‐I , Wein Yung‐Shung , Kuo Yueh‐Hsiung 
Published: May 2015

AbstractTwo new phenol glycosides, 3,4,5‐trimethoxyphenol‐1‐O‐β‐d‐glucopyranosyl‐4′,6′‐O‐(E)‐diferuloyl ester (1), 3,5‐dimethoxy‐4‐hydroxyphenylmethanol‐4‐O‐β‐d‐glucopyranosyl‐4′,6′‐O‐(E)‐diferuloyl ester (2), together with six known compounds were isolated from the n‐butanol extract of Rhus javanica var. roxburghiana and their structures were established by various spectroscopic techniques.
Ethylenebis(N‐Methylimidazolium) Chlorochromate (EBMICC): A New Selective and Mild Reagent for Oxidation of Alcohols, Hydroquinones and Trimethylsilyl Ethers
Authors: Hosseinzadeh Rahman , Tajbakhsh Mahmood , Khaledi Hamid 
Published: May 2015

AbstractThe ethylenebis(N‐methylimidazolium) chlorochromate was prepared by addition of N‐methylimidazole to 1,2‐dibromoethane to form the corresponding dibromide salt and subsequent treatment of this salt with CrO3 in 6N HCl solution. It is a stable yellow‐orange solid which selectively oxidized benzylic and allylic alcohols, hydroquinones and trimethylsilyl ethers in refluxing acetonitrile. Oxidation of alcohols was also examined under solvent‐free conditions and showed much better yields of the corresponding carbonyls in a very short reaction time when compared with the conventional method.
Viscosity Prediction for Oxygen, Nitrogen and Their Mixtures at Zero and Moderately Dense Regimes via Semi‐Empirically Based Assessment
Authors: Haghighi Behzad , Papari Mohammad Mehdi , Shahidi Daruish 
Published: May 2015

AbstractThe viscosity coefficients for the gaseous states of N2 and O2 and their mixtures are determined at zero and moderately density regimes. The Lennard‐Jones 12–6 (LJ 12–6) potential energy function is used as the initial model potential required y the technique. The interaction potential energies from the inversion procedure reproduce the viscosity commensurate to the best measurements. The initial density dependence of gaseous viscosity coefficient according to the Rainwater‐Friend theory, which was given by Najafi et al., has been considered for pure N2 and pure O2.
Simultaneous Voltammetric Determination of Lead and Tin by Adsorptive Differential Pulse Stripping Method and Orthogonal Signal Correction‐Partial Least Squares in Water Samples
Authors: Niazi Ali , Amjadi Effat , Nori‐Shargh Davood , Bozorghi Saeed Jameh 
Published: May 2015

AbstractAn adsorptive differential pulse stripping method for the simultaneous determination of lead and tin is proposed. The procedure involves an adsorptive accumulation of lead and tin on a hanging mercury drop electrode (HMDE), followed by oxidation of adsorbed lead and tin by voltammetric scan using differential pulse modulation. The optimum experimental conditions are: 0.2 mol L−1 HNO3, accumulation potential of −900 mV versus Ag/AgCl, accumulation time of 200 s, scan rate of 20 mV s−1 and pulse height of 80 mV. Lead and tin peak currents were observed in the same potential region at about −400 mV. The simultaneous determination of lead and tin by using voltammetry is a difficult problem in analytical chemistry, due to voltammogram interferences. The resolution of a mixture of lead and tin by the application of orthogonal signal correction‐partial least squares (OSC‐PLS) was performed. The linear dynamic ranges were 0.003‐0.35 and 0.008‐0.50 μg mL−1 and detection limits were land 3 ng mL−1 for lead and tin, respectively. The RMSEP for lead and tin with OSC and without OSC were 2.8737, 6.0557 and 8.0941, 9.5151, respectively. The capability of the method for the analysis of real samples was evaluated by the determination of lead and tin in water samples with satisfactory results.
Resolution of Overlapped Capillary Electrophoresis Peaks by Using Heuristic Evolving Latent Projections to Quantify Chloroquine Phosphate and Promethazine Hydrochloride
Authors: Jiao Long , Wang Kang , Zhang Fang , Li Hua 
Published: May 2015

AbstractChloroquine phosphate and promethazine hydrochloride are two main components in compound reserpine tablets. It is difficult to separate the two compounds with capillary electrophoresis (CE). Heuristic evolving latent projections (HELP) is a chemometric algorithm which is suitable for resolving overlapped peaks from CE and HPLC. In this paper, HELP was applied to resolving the completely overlapped peaks of chloroquine phosphate and promethazine hydrochloride from CE. Mathematical separation and satisfactory quantification results can be achieved easily without too much time involved in the procedure.
Calculation of Negative Ions of B, C, N, O and F Using Noninteger n Slater Type Orbitals
Authors: Guseinov I. I. , Ertürk M. , Şahin E. , Aksu H. , Bağcı A. 
Published: May 2015

AbstractCombined Hartree‐Fock‐Roothaan calculations have been performed using noninteger n Slater type orbitals for the ground states of the lowest electron configurations 1s22s22pn (2 ≤ n ≤ 6) for negative ions of B, C, N, O and F. These results are compared with the corresponding results obtained from the use of integer n Slater type orbitals. All of the nonlinear parameters are fully optimized. The results of calculation of coupling‐projection coefficients, orbital and total energies and virial ratios are presented. It is shown that the noninteger n Slater type orbitals, in general, improve the orbital energies.
Studies on the Electrochemical Properties of Amphiphilic Ferrocenylimines Compounds
Authors: Liu Ping‐Ping , Mu Bing , Li Tie‐Sheng , Ye Bao‐Xian , Wu Yang‐Jie 
Published: May 2015

AbstractA series of amphiphilic ferrocenylimine compounds (four amphiphilic ferrocenylimines and four corresponding palladium complexes) were synthesized and their electrochemical characters were also investigated in detail. The results revealed that the redox of ferrocene derivatives was assumed by the ferrocene group and affected by substituent groups. Some effect rules were discovered and are described here. Moreover, the dynamics parameters of the electrode process were detected by several electrochemistry techniques.
Determination of Polybrominated Diphenyl Ethers in Coastal and River Sediments by Pressurized Liquid Extraction Coupled with Gas Chromatography‐Mass Spectrometry
Authors: Jhong Yin‐Ju , Ding Wang‐Hsien 
Published: May 2015

AbstractThis study presents a time‐ and solvent‐saving method, pressurized liquid extraction (PLE), to extract polybrominated diphenyl ethers (PBDEs) in sediment samples. The effects of various operating parameters (i.e., extraction solution, temperature, pressure, static/dynamic extraction times) for the quantitative extraction of PBDEs by home‐made PLE were systematically investigated and optimized. The analytes were then identified and quantitated by gas chromatography‐mass spectrometry (GC‐MS) in selected ion monitoring (SIM) mode. The 16 PBDE congeners (from tri‐ to deca‐BDE) can be completely extracted by dichloromethane: n‐hexane (3/2, v/v) at 100 °C and 100 atm combined with 15 min static and then 15 min dynamic extraction steps. Recovery of PBDEs in spiked sediment samples ranged from 52 to 104% with 2‐16% RSD, except for BDE‐206. Limits of quantitation (LOQ) were established between 4 and 400 pg/g (dry weight) in 10 g of sediment sample. The extraction efficiency of the PLE was also compared with the traditional Soxhlet extraction method. The total contents of PBDEs ranged from 8.0 to 37.9 ng/g (dry weight) in various river and coastal sediment samples in Taiwan. Deca‐BDE (BDE‐209) was the major PBDE detected in these sediment samples.
Partition Coefficient Prediction of a Large Set of Various Drugs and Poisons by a Genetic Algorithm and Artificial Neural Network
Authors: Riahi Siavash , Beheshti Abolghasem , Mohammadi Ali , Ganjali Mohammad Reza , Norouzi Parviz 
Published: May 2015

AbstractA quantitative structure‐property relationship (QSPR) was developed using Artificial Neural Network (ANN) modeling to study partition coefficients (LogP) of various drugs and poisons. A set of 197 drugs and poisons were selected and suitable sets of molecular descriptors were calculated. A genetic algorithm was used to select important molecular descriptors and a supervised ANN was applied to correlate the selected descriptors with the experimental values of LogP. The developed model indicates that molecular branching and mass, polar parts and volume of molecule can be used to predict the partition coefficient of drugs and poisons. The described model does not require experimental parameters and potentially provides useful prediction for LogP of new drugs and poisons. For genetic algorithm neural network methods, the standard errors of calibration, test and prediction were 2.94, 2.84 and 4.38%, respectively. The predicted LogP values were compared with those obtained previously via other models on the same subject and the comparison clearly revealed the superiority of the proposed model over other models.
Conductance and Thermodynamic Study of the Complexation of Ammonium Ion with Different Crown Ethers in Binary Nonaqueous Solvents
Authors: Khayatian Golamreza , Karoonian Fatemeh Salehi 
Published: May 2015

AbstractA conductance study of the interaction between ammonium ion and 18‐Crown‐6 (18C6), dicyclohexano‐18‐crown‐6 (DC18C6), ditertbutyl‐dicyclohexano‐18‐crown‐6 (t‐bu)2DC18C6, diaza‐15‐crown‐5 (DA15C5), dibenzo‐21‐crown‐7 (DB21C7) and N‐Phenylaza‐15‐crown‐5 (NPA15C5) in acetonitril‐di‐methylsulfoxide mixture was carried out at various temperatures. The formation constants of the resultant 1:1 complexes were determined from the molar conductance‐mole ratio data and found to vary in the order of DA15C5 > DC18C6 > 18C6 > (t‐bu)2DC18C6 > DB21C7 > NPA15C5.The enthalpy and entropy of the complexation reactions were determined from the temperature dependence of the formation constants.
Synthesis and Antimicrobial Studies of Some Quinolinylpyrimidine Derivatives
Authors: Munawar Munawar Ali , Azad Muhammad , Siddiqui Hamid Latif , Nasim Faiz‐Ul‐Hassan 
Published: May 2015

AbstractThe quinolinylpyrimidine derivatives were prepared by the condensation of quinolinyl chalcones with urea (or thiourea) under basic conditions by using both conventional and microwave heating. Their IR, 1H NMR, 13C NMR, mass spectra and CHN analyses confirmed the prepared compounds. The newly prepared quinolinylpyrimidine derivatives were screened for antimicrobial activities against the bacterial strains viz. S. aureus, Shigella, Salmonela, P. aeroginosa, B. Subtilus and E. coli and found considerably active against S. aureus, P. aeroginosa and E. coli.
Reactions of Hydrazonoyl Halides 571: Reactions of 1‐Bromo‐2‐(5‐Chlorobenzofuranyl)Ethanedione‐1‐Phenylhydrazone
Authors: Abdelhamid Abdou O. , El‐Ghandour Ahmed H. , El‐Reedy Ahmed A. M. 
Published: May 2015

AbstractPyrrolo[3,4‐c]pyrazole‐4,6‐diones, pyrazoles, pyrazolo[3,4‐d]pyridazines, and pyrazolo[3,4‐d]pyrimidines were prepared via 1‐bromo‐2‐(5‐chlorobenzofuran‐2‐yl)ethanedione‐1‐phenylhydrazone with N‐arylmalemides and active methylene. All newly synthesized compounds were confirmed by elemental analysis and spectral data.
The Preparation of (8‐Hydroxyquinolinato)Bis(2‐Phenylpyridyl)Iridium Complexes and Their Photophysical Properties
Authors: Huang Duo‐Fong , Chow Tahsin J. , Wu Cheng‐Yang , Sun Shih‐Sheng , Tsai Sheng‐Heng , Wen Yuh‐Sheng , Polosan Silviu , Tsuboi Taiju 
Published: May 2015

AbstractFour derivatives of the titled compounds, (8‐hydroxyquinoline)bis(2‐phenylpyridyl)iridium (IrQ(ppy)2), were prepared. Two of them were confirmed by single crystal X‐ray diffraction analyses, in which solvent molecules were found to be incorporated in the crystal lattices. Their emission spectra display separated dual bands in de‐aerated solutions at about 515 and 645 nm upon excitation. These green and red emissions are attributed to the triplet metal‐to‐ligand charge transfer (3MLCT) and triplet ligand centered (3LC) transitions in Ir(ppy)2 and IrQ, respectively. It is suggested that such a multiple emission is feasible by nearly orthogonal orientation between the ppy and quinoline ligands in the mixed‐ligand Ir‐compounds which prohibits energy transfer between the two different ligands. The electroluminescence (EL) of these compounds was examined by the fabrication of light‐emitting diodes (LEDs). Unlike the spectra in solutions, their EL spectra displayed only the red emission band. Devices displaying white light can be obtained by mixing the red emission of IrQ(ppy)2 with a compatible blue emitter (NPB) in separated layers.