bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electrochemical Properties of Th(IV)‐Hexacyanoferrate Sol‐Gel Carbon Composite Electrode: Electrocatalytic Oxidation of Dopamine and Ascorbic Acid
Authors: Farhadi Khalil , Kheiri Farshad , Golzan Mir Maqsood 
Published: May 2015

AbstractA new sol‐gel carbon composite electrode using hexacyanoferrate (HCF)‐Th(IV) ion pair as a suitable modifier is fabricated in the present study. The Th(IV)‐HCF‐sol‐gel carbon composite electrode (THCF‐CCE) has been prepared by mixing methyl trimethoxysilan (MTMOS) sol‐gel precursor and carbon powder with ion pair and then to fix in a plastic tube. Cyclic voltammetry and chronoamperometry were employed to study the electrochemical and electrocatalytic properties of proposed electrode. The apparent charge transfer rate constant, ks, and transfer coefficient, α, for electron transfer between ion‐pair and sol‐gel CPE were calculated as 3.10 ± 0.10 s−1 and 0.52, respectively. The THCF‐CCE showed a significant electrocatalytic activity towards oxidation of ascorbic acid (AA) and dopamine (DA) in 0.1 M acidic phosphate buffer solutions (pH 3) containing KCl as a supporting electrolyte. The mean value of the diffusion coefficients for ascorbic acid and dopamine were found 4.12 × 10−5 and 4.43 × 10−5 (cm2s−1), respectively. High stability, good reproducibility, rapid response, easy surface regeneration and fabrication are the important characteristics of the proposed sensor. The resulting peaks from the electrocatalytic oxidation of AA and DA were well resolved with good sensitivity. A linear response was observed for AA and DA in the concentration range of 1 × 10−5 to 3 × 10−3 M and 4 × 10−6 to 2.2 × 10−4 M, respectively.
Simple and Sensitive Extractive Spectrophotometeric Method for the Assay of Mebeverine Hydrochloride in Pure and Pharmaceutical Formulations
Authors: Siddappa K. , Mallikarjun M. , Reddy Tukaram , Tambe Mahesh 
Published: May 2015

AbstractSimple, sensitive, rapid and cost effective extraction spectrophotometric methods are described for the assay of mebeverine hydrochloride (MBH) in bulk samples and pharmaceutical formulations. These two methods (Bromophenol blue and Erichrome Black‐T) are based on the formation of chloroform soluble ion‐pair complexes of MBH with Bromophenol blue (BPB) and with Erichrome Black‐T (EBT), to form yellow and pink colored chromogen in a Glycine‐HCl buffer of pH 2.4 (BPB) and in a KCl‐HCl buffer of pH 1.4 (EBT) with absorbance maximum at 416 nm and at 524 nm for BPB and EBT respectively. The calibration graph is found to linear over 0.2–20 μg/mL (BPB) and 0.2–20 μg/mL (EBT), with molar absorptivity values of 1.8295 × 104 1 moL−1 cm−1 and 1.5896 × 104 1 moL−1 cm−1, respectively. The LOD (Limit of Detection) were found to be 0.090 μg/mL and 0.084 μg/mL and LOQ (Limit of Quantification) were 0.2997 μg/mL and 0.2730 μg/mL for the BPB and EBT method, respectively. The results of analysis for the two methods have been validated statistically and by recovery studies. The results are compared with those obtained with reported method. The proposed methods are simple, sensitive, accurate and suitable for quality control applications.
Application of Luminescent BSA‐Capped CdS Quantum Dots as a Fluorescence Probe for the Detection of Cu2+
Authors: Han Su‐Qin , Liu Jian‐Li , Gan Zhi‐Gang , Liang Jian‐Gong , Zhao Shou‐Miao 
Published: May 2015

AbstractCdS Quantum dots (QDs) are synthesized in aqueous solution with bovine serum albumin (BSA) as the stabilizing agents using a stepwise procedure at room temperature. They can be used as a new fluorescence probe in the determination of Cu2+, which is proved to be a simple, rapid and specific method. Approximate concentrations of other physiologically important cations, such as Zn2+, K+ etc, have no effect on the fluorescence. Under the optimum condition, the response is linear to the concentration of Cu2+ in the range of 0‐80.0 μol/L, and the detection limit is 50.0 nmol/L. This method is used to the determination of Cu2+ in human hair, the recovery is 98‐104%. And the possible detection mechanism is also discussed.
Cold Deposition as a Novel Procedure for the Preparation of Titania Sol‐Gel: A Development of a High Sensitive Electrochemical Method for Determination of Cu(II) in the Presence of Arsenic(III)
Authors: Farhadi Khalil , Kheiri Farshad , Golzan Mir Maqsoud 
Published: May 2015

AbstractTitania sol‐gel modified gold electrode (TSGMGE) was prepared with the usage of a new proposed cold deposition method at −10 °C. Scanning electron microscope (SEM) operating at 30 kV was used to obtain micrographs of unmodified and modified electrodes. The obtained results showed that this procedure yields a sol‐gel with high porosity in comparison to conventional methods. The modified Au electrode was fabricated by trapping the L‐glutamine in titania sol‐gel at low temperatures to preparation of a new titania sol‐gel glutamine modified gold electrode (TSGGMGE). The possibility determination of traces of Cu(II) in the presence of As(III) was investigated using proposed electrode. Under the optimized conditions, copper was accumulated at −0.35 V (vs. Ag/AgCl) for 40 s in 0.1 M acetate buffer (pH 4.0) in the presence of different amounts of arsenic. Two dynamic linear responses with good reproducibility were observed for copper ions in the concentration range of 1 × 10−6 −4 × 10−4 M and 4 × 10−8 −6 × 10−7 M.
Condensation of 1‐(Dicyanomethylene)acenaphthene‐2‐one with Aromatic Diamines
Authors: El‐Shaieb Kamal M. 
Published: May 2015

Abstract1‐(Dicyanomethylene)acenaphthene‐2‐one (1) reacts with 1,8‐diaminonaphthalene (2) to yield two products, identified as acenaphtho[1,2‐b]naphtho[1,8‐ef][1,4]diazepine (3) and (Z)‐2‐(8‐aminonaphthalen‐1‐ylamino)‐2‐(2‐oxoacenaphthylen‐1(2H)‐ylidene)acetonitrile (4). On the other hand, (2Z,2′Z)‐2,2′‐(hydrazine‐1,2‐diylidene)diacenaphthylen‐1(2H)‐one (6) was obtained during the condensation process of 1 with hydrazine hydrate (5). Reaction of 1 with 3,4‐diaminotoluene (8b) produces 9‐methylacenaphtho[1,2‐b]quinoxaline (9b) and (Z)‐2‐(2‐amino‐5‐methylphenyl‐amino)‐2‐(2‐oxoacenaphthylen‐1(2H)‐ylidene)acetonitrile (10b). However, treatment of 5,6‐diamino‐pyrimidine‐2,4‐diol hemisulphate (11) with 1 affords acenaphtho[1,2‐g]pteridine‐9,11‐diol (12).
TH‐11, a Streptomyces sp. Strain that Degrades Poly(3‐Hydroxybutyrate) and Poly(Ethylene Succinate)
Authors: Hoang Kim‐Chi , Lee Chung‐Yi , Lai Yi‐Chi , Liau Chun‐Yi 
Published: May 2015

AbstractTH‐11, a bacterial strain with strong depolymerase activity that breaks down aliphatic esters such as poly(3‐hydroxybutyrate) (PHB) and poly(ethylene succinate) (PES) was isolated from a soil sample collected from the sediment of Tou‐Chain River, Taiwan, R.O.C. It was phenotypically and genetically characterized to be a Streptomyces strain. The degradation of PHB and PES were tested both using emulsified polymers in solid agar and thin polymer films in liquid culture media. The degradations were measured by clear‐zone formation on solid agar plates, or direct weight measurements and electromicroscope inspection of the incubated polymer films in the liquid culture. The depolymerase activities can be detected in the cell‐free preparation of the culture medium, and can be enhanced by gelatin.
Synthesis of Morphlinotetrahydrothieno[2,3‐c]Isoquinolines
Authors: El‐Dean Adel M. Kamal , Radwan Shaban M. , Zaki Remon M. 
Published: May 2015

Abstract1‐Morpholin‐4‐yl‐5,6,7,8‐tetrahydroisoquinoline‐4‐carbonitrile (2) was synthesized from 3‐amino‐1‐thioxo‐5,6,7,8‐tetrahydro‐1H‐isothiochromene‐4‐carbonitrile (1) and used as starting material to synthesize many thienotetrahydroisoquinolines (4), which in turn were used in the synthesis of many pyrimidothienotetrahydroisoquinolines.
Analysis Laboratory on a Chip
Authors: Lin Bing‐Cheng , Gao Yan , Qin Jian‐Hua 
Published: May 2015

AbstractMicrofluidic chip offers a promising platform for chemical or biological analysis on the basis of flexible integration of various functional operation units. This article provides an overview of the recent achievements of microfluidic chip and its applications based on the works mainly carried out in the authors' lab, especially for the purpose of constructing analytical laboratory on a microfluidic chip. Different operation units and some representative applications in molecules, cell and organism analysis are described.
Ligand‐Tuning of the Excitation Wavelength of a Solid state E/Z Isomerization: [Zn(TA)2(2,2′‐Bipyridyl)] in a Supramolecular Framework
Authors: Zheng Shao‐Liang , Gembicky Milan , Messerschmidt Marc , Coppens Philip 
Published: May 2015

AbstractThe single‐crystal‐to‐single‐crystal (SCSC) EŕZ photoisomerization of TA in the supramolecular solid CECR‐[Zn(TA)2(bpy)]·H2O (CECR = C‐ethylcalixresorcinarene, HTA = tiglic acid, and bpy = 2,2′‐bipyridine, is induced by 458 nm light, indicating a red‐shift of the photo‐active wavelength on introduction of the aromatic bpy ligand compared with the previously studied reaction of CECR‐[Zn(TA)2(H2O)2] 4H2O. Theoretical calculations show that the initial excitation involves the bipyridyl ligand, which acts as an intramolecular photosensitizer for the isomerization process. The reaction is topotactic and illustrated by photodifference maps.
DFT Modelling of the Magnetic Coupling in a Di‐ and in a Trinuclear Robson‐Type Complexes of CuII
Authors: Labéguerie Pierre , Rohmer Marie‐Madeleine , Bénard Marc 
Published: May 2015

AbstractDFT/B3LYP calculations are able to reproduce the magnetic behaviour of dinuclear complexes of CuII within the framework of the Heisenberg Hamiltonian. The trinuclear complexes recently characterized by Glaser et al from trinucleating Robson‐type ligands provide an opportunity to extend the application of the broken symmetry formalism to a nonsymmetric CuIICuIICuII framework. At variance with the tentative fit deduced from experiment, the calculations suggest that the coupling along the three magnetic centers could be weak.
Synthesis and Biological Activity Evaluation of Novel Imidazolidinedione Derivatives, as Potent Antidiabetic Agent
Authors: Wang Run‐Ling , Li Wen‐Ming , Liu Meng‐Yuan , Xu Wei‐Ren 
Published: May 2015

AbstractA set of novel imidazolidinedione derivatives were synthesized and evaluated as potential antidiabetic agents. Imidazolidinedione scaffold‐based molecules were synthesized and validated on a mice hyperglycemia model caused by alloxan. As a result, three of them showed antihyperglycemic activities. This research provides useful clues for further design and discovery of antidiabetic agents.
Ultrasound‐Assisted Wittig Reaction: A Short, Efficient Synthesis of 2‐Methoxy‐6‐Alkyl‐1,4‐Benzoquinones
Authors: Wu Li‐Qiang , Yang Chun‐Guang , Yang Li‐Ming , Yang Li‐Juan 
Published: May 2015

AbstractA short, efficient synthesis of 2‐methoxy‐6‐alkyl‐1,4‐benzoquinones is described. Ultrasound‐assisted Wittig reaction of alkyltriphenyl phosphonium bromides with o‐vanillin in basic aqueous conditions followed by reduction with Na/n‐BuOH gave 2‐methoxy‐6‐alkylphenols. Oxidation of 2‐methoxy‐6‐alkylphenols with Fremy's salt produced the title compounds.
A Multi‐Center Energy Analysis of the Tunable Proton Affinity of Hydrogen Bonded Cluster Ions
Authors: Lankau Timm , Yu Chin‐Hui 
Published: May 2015

AbstractThe proton affinity (PA) of the [Tca–HβMim]− ion (Tca−: trichloroacetate ion, HMim: 4‐Methyl‐1H‐imidazole) is a nearly linear function of the position (r3) of Hβ using the rigid framework approximation. This useful property of the ion is caused by an unusually large four‐center interaction term revealed by the multi‐center energy (MCE) analysis of PA(r3). The MCE analysis shows further that despite the general stabilization of the [Tca–HMim–HAc]− ion by cooperative effects, the individual hydrogen bonds carry a strong anti‐cooperative element caused by the rivalry of the two bases for the proton linking them.
Crystal Structures, Magnetic Properties and Catecholase‐Like Activities of μ‐Alkoxo‐μ‐Carboxylato Double Bridged Dinuclear and Tetranuclear Copper(II) Complexes
Authors: Chen Chih‐Yu , Lu Jian‐Wei , Wei Ho‐Hsiang 
Published: May 2015

AbstractOne μ‐alkoxo‐μ‐carboxylato bridged dinuclear copper(II) complex, [Cu2(L1)(μ‐C6H5CO2)] (1)(H3L1 = 1,3‐bis(salicylideneamino)‐2‐propanol)), and two μ‐alkoxo‐μ‐dicarboxylato doubly‐bridged tetranuclear copper(II) complexes, [Cu4(L1)2(μ‐C8H10O4)(DMF)2]·H2O (2) and [Cu4(L2)2(μ‐C5H6O4]·2H2O·2CH3CN (3) (H3L2 = 1,3‐bis(5‐bromo‐salicylideneamino)‐2‐propanol)) have been prepared and characterized. The single crystal X‐ray analysis shows that the structure of complex 1 is dimeric with two adjacent copper(II) atoms bridged by μ‐alkoxo‐μ‐carboxylato ligands where the Cu···Cu distances and Cu‐O(alkoxo)‐Cu angles are 3.5 11 Å and 132.8°, respectively. Complexes 2 and 3 consist of a μ‐alkoxo‐μ‐dicarboxylato doubly‐bridged tetranuclear Cu(II) complex with mean Cu‐Cu distances and Cu‐O‐Cu angles of 3.092 Å and 104.2° for 2 and 3.486 Å and 129.9° for 3, respectively. Magnetic measurements reveal that 1 is strong antiferromagnetically coupled with 2J =‐210 cm−1 while 2 and 3 exhibit ferromagnetic coupling with 2J = 126 cm−1 and 82 cm−1 (averaged), respectively. The 2J values of 1–3 are correlated to dihedral angles and the Cu‐O‐Cu angles. Dependence of the pH at 25 °C on the reaction rate of oxidation of 3,5‐di‐tert‐butylcatechol (3,5‐DTBC) to the corresponding quinone (3,5‐DTBQ) catalyzed by 1–3 was studied. Complexes 1–3 exhibit catecholase‐like active at above pH 8 and 25 °C for oxidation of 3,5‐di‐tert‐butylcatechol.
A New Low‐Molecular‐Weight Gelator: 2,4,6‐Tris(N′‐Laurylureido‐Phenoxy)Triazine in Different Solvents
Authors: Lu Cheng‐Chi , Su Shuenn‐Kung 
Published: May 2015

AbstractA new gelator of urea‐containing triazine derivatives was synthesized, and its gelation potential was examined in different organic solvents. The compound was found to form organogels with a variety of organic solvents such as decalin and other solvents. The resulting thermo‐reversible gel was characterized by using the dropping ball method and a number of other instruments. The melting temperature of the gels in decalin and DMSO increased with the gelator concentrations. Intermolecular hydrogen bonding of gelation was observed with a FT‐IR spectrometer. Temperature‐dependent UV‐Vis and fluorescence analysis revealed that the organogels displayed the H‐type aggregation in decalin and the J‐type aggregation in DMSO. The morphological features of the gels in decalin and DMSO were studied by applying atomic force microscopy (AFM), and the morphological features demonstrated that there were different aggregations in different solvents.
On‐Surface Cyclization of Tetrapeptides Using Molecularly Imprinted Polymers as Non‐Covalent Auxiliaries
Authors: Lin Yee‐Fung , Lee Shih‐Ming , Chen Chi‐Tai , Lu Kao‐Haw , Tai Dar‐Fu 
Published: May 2015

AbstractBased on the fabrication of molecularly imprinted polymeric film on cellulose paper (MIFC), we have developed a robotic system for homodetic tetrapeptide cyclization. We constructed molecularly imprinted polymeric film (MIPF) on cellulose paper as the non‐covalent auxiliary to assist cyclic tetrapeptide (CTP) formation. Tetrapeptides were bound by their hydrophobic interaction with MIFC. With the help of MIFC and a coupling reagent, quantitative synthesis of CTPs was achieved conveniently for various tetrapeptides. The syntheses of cyclic tetrapeptide (CTP) could also be facilitated using the MIFC induced from CTP or other tetrapeptides with partially matched sequences.
Simultaneous Spectrophotometric Determination of Paracetamol and P‐Aminophenol by Using Mean Centering of Ratio Kinetic Profiles
Authors: Kamyabi Mohammad Ali 
Published: May 2015

AbstractA specific spectrophotometric method was developed for simultaneous determination of paracetamol (PCT) and p‐aminophenol (PAP) in water samples without prior separation steps. The method is based on the mean centering of ratio kinetic profiles. Paracetamol and P‐aminophenol react with Fe(III)/hexacyanoferrate(III) complex and result in the formation of colored complex, i.e. Prussian Blue. The differences in the rate of reaction of PCT and PAP with reagents make their simultaneous determination feasible by using mean centering of ratio kinetic profiles.The experimental parameters, such as reagent concentrations and pH were optimized for getting results with minimum errors. The analytical characteristics of the method such as detection limit, accuracy, precision, relative standard deviation (R.S.D.) and relative standard error (R.S.E.) for the simultaneous determination of binary mixtures of p‐aminophenol and acetaminophen were calculated. The results show that the method was capable of simultaneous determination of 0.5–21.0 μg mL−1 and 0.1–15.0 μg mL−1 of PCT and PAP, respectively. The proposed method was successfully applied to the simultaneous determination of paracetamol and p‐aminophenol in several pharmaceutical products and synthetics mixtures.
Chemiluminescence Determination of Sulpiride in Pharmaceutical Preparations and Biological Fluids Based on KMnO4‐Tween 80 Reaction
Authors: Li Yin‐Huan 
Published: May 2015

AbstractChemiluminescence (CL) of an acidic KMnO4 system in the presence of Tween 80 was investigated for the determination of sulpiride. Strong CL was recorded when a mixture of sulpiride and Tween 80 was injected into acidic KMnO4 solution. The experimental parameters affecting the CL intensity were carefully studied using flow injection mode. Under the optimum conditions, the CL intensity was proportional to the concentration of sulpiride in the range of 5.0 × 10−7 ∼ 1.0 × 10−4 g mL−1. The detection limit is 1.6 × 10−7 g mL−1 sulpiride, and the relative standard deviation for 1.0 × 10−6 g mL−1 sulpiride solution is 1.5% (n = 11). The proposed method has been successfully applied to the determination of sulpiride in tablets and in spiked human plasma and urine samples.
Simultaneous Determination of Paracetamol and Orphenadrine Citrate in Dosage Formulations and in Human Serum by RP‐HPLC
Authors: Arayne M. Saeed , Sultana Najma , Siddiqui Farhan Ahmed 
Published: May 2015

AbstractRapid liquid chromatographic procedures are proposed for analysis of paracetamol and orphenadrine citrate in pharmaceutical preparations and human serum using acetonitrile: water (50:50) as a mobile phase, adjusting pH to 2.6, UV detection at 215 nm and propylparaben sodium as internal standard. The advantages of this method include good and rapid separation, well resolved peaks, and only a small amount of sample is required for assay and adequate precision. The method showed good linearity in the range of 6 to 10000 ng/mL for paracetamol serum concentrations with a correlation coefficient 0.9999 (inter and intra day CV < 3.15) and in the range 3–10000 ng/mL for orphenadrine citrate serum concentrations with a correlation coefficient of 0.9999 (inter and intra day CV < 3.58). The recovery of paracetamol and orphenadrine citrate was > 96.9% and > 96.7%, respectively. The proposed method may be used for the quantitative analysis of paracetamol and orphenadrine citrate alone or in combination from raw materials, in bulk drugs, dosage formulations and in serum.
Cyclic Voltammetrically‐Prepared MnO2 Coated on an ITO Glass Substrate
Authors: Ding Ke‐Qiang 
Published: May 2015

AbstractFor the first time, nanostructured manganese dioxide was successfully electrodeposited onto an ITO (indium tin oxide) glass substrate by cyclic voltammetry (CV) method from an aqueous solution of 0.1 M Na2SO4 containing 5 × 10−3 M MnSO4. The obtained manganese dioxide‐modified ITO glass substrates were characterized by energy dispersive spectrometry (EDS), Fourier transform infrared spectrometry (FTIR) and scanning electron microscopy (SEM), respectively. All results not only proved the existence of MnO2 on an ITO glass substrate but also demonstrated that the morphology of the obtained MnO2 was greatly affected by the electrodeposition conditions. Also, this MnO2‐modified ITO electrode was systematically investigated by cyclic voltammetry (CV), chronopotentiometry and electrochemical impedance spectroscopy (EIS) in an aqueous electrolyte of 0.1 M Na2SO4. The results obtained from electrochemical measurement indicated that this developed MnO2‐modified ITO electrode has a satisfied specific capacitance value of 264 F·g−1 and exhibits excellent electrochemical stability and reversibility.
Sulfamic Acid as a Cost‐Effective and Recyclable Catalyst for β‐Amino Carbonyl Compounds Synthesis
Authors: Luo Hai‐Tang , Kang Yu‐Ru , Nie Hong‐Yun , Yang Li‐Ming 
Published: May 2015

AbstractSulfamic acid was used as a catalyst in the synthesis of β‐amino carbonyl compounds from amines, acetophenone and aldehyde. The reaction was carried out at room temperature. High selectivity, mild reaction temperature, cost‐effective catalyst, simple product separation and catalyst recycle were notable achievements in the reaction. Another feature was that the reaction could be performed on a relatively larger scale to the model reaction (50 times), which also gave good yields. In particular, the first preparation of β, β'‐diamino diketone derivatives via the direct coupling of amines, acetophenone and isophthalic aldehyde promoted by sulfamic acid has been developed.
An Efficient Catalytic Procedure for the Selective Oxidation of Sulfides to Sulfoxides by Citric Acid/Al(NO3)3.9H2O/MBr Under Mild and Heterogeneous Conditions
Authors: Ghorbani‐Choghamarani Arash , Rezaei Somaieh 
Published: May 2015

AbstractA wide range of aliphatic or aromatic sulfides are selectively oxidized to the corresponding sulfoxides using Al(NO3)3.9H2O, citric acid and a catalytic amount of KBr or NaBr in the presence of wet SiO2 (50% w/w)in CH2Cl2 under mild and heterogeneous conditions in good to high yields.
A Simple Method to Prepare On‐Capillary Frits for Micro‐Column Separation
Authors: Zhang Yi‐Jun , Chen Na , Wang Ai‐Rong , Wei Xin‐Jun , Zhang Yu‐Ping , Qu Ling‐Bo 
Published: May 2015

AbstractSintering stainless steel powders was initially used to prepare the inlet frit in fused silica capillaries. The use of such inlet frits and outlet frits sintered by the stationary phase itself in the capillary to retain C18 particles was demonstrated to withstand the long exposure, up to a high pressure of 60 MPa, for packing and the prepare column was stable and robust enough to do the continuous chromatographic operations. Characterization of the inlet and outlet frits by scanning electron micrography showed the fused metal particles formed a porous network in the capillary inlet and the homogenous separation beddings were obtained by slurry packing.
Nanocrystals of Co2+‐Doped MgGa2O4: Preparation by a Low‐Temperature Combustion Method and Optical Properties
Authors: Lu Hai‐Liang , Du Ji‐Yong , Tang Zi‐Qiang , Liu Chang‐Ning 
Published: May 2015

AbstractCo2+‐doped MgGa2O4 nanocrystals were prepared at 500°C by a low‐temperature combustion method without any further calcination. Powder X‐ray diffraction (XRD) indicated that the only crystalline phase in the product was MgGa2O4 with a grain size of 33–36 nm. Scanning electron microscopy (SEM) showed that the products contained pores formed by the gases evolved during the combustion reaction. The excitation and emission spectra of the nanocrystalline powders in the visible and near infrared regions were characteristic of tetrahedral Co2+ ions, suggesting that Co2+ ions replaced tetrahedral Mg2+ ions in the MgGa2O4 crystals. We assigned the visible and near infrared luminescent bands to the spin‐allowed 4T1(4P) → and 4A2(4F) and 4T1(4P) → 4T2(4F) transitions.