bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis, Reactivity and Crystal Structure of β‐Diketiminate Ytterbium Chlorides
Authors: Luo Yun‐Jie , Yao Ying‐Ming , Zhang Yong , Shen Qi , Yu Kai‐Bei 
Published: September 2010

AbstractReaction of anhydrous YbCI3 with 1 equiv. of LLi [L=p‐CIPhNC(Me)CH(Me)N(C6H3‐‐2,6‐i‐Pr2)] in THF at room temperature gave the diketiminate lanthanide dichloride LYbCl2(THF)2 (1) in good isolated yield. Similarly reaction of anhydrous YbCI3 with 1 equiv. of LLi, then with I equiv. of t‐BuCpNa in THF yielded the expected mixed‐ligand β‐diketiminate ytterbium chloride (t‐BuCp)YbL(μ‐CI)2 Li(THF)I (2). Both 1 and 2 were well characterized by elemental analysis, IR spectra, 1H NMR spectra, and X‐ray diffraction analysis.
Methylation of 5‐Amino‐3‐methylthio‐1 H‐pyrazole Derivatives and Two Related Crystal Structures
Authors: Ren Xue‐Ling , Wu Chao , Hu Fang‐Zhong , Zou Xiao‐Mao , Yang Hua‐Zheng 
Published: September 2010

Abstract5‐Amino‐3‐methylthio‐1H‐pyrazoles are very important building blocks from which a wide variety of pyrazole derivatives can be prepared. When substituted 5‐amino‐3‐methylthio‐1H‐pyrazole was treated with CH3I, the methylation occurres at endocyclic two nitrogens at the same time. The ratio of isomers in products was depended upon the nature of 4‐position substituent in the pyrazole ring. The products were characterized by X‐ray diffraction analysis, and the ratios of isomer were explained by means of the results of ab inito calculation.
Synthesis, Crystal Structure and Properties of a New One‐Dimensional 3d‐4f Compound
Authors: Qi‐Hua Zhao , Wang Qing‐Hua , Fang Rui‐Bin , Chen Zhi‐Da 
Published: September 2010

AbstractA new heterometallic complex K2[{Eu(H2O)4}2{Fe11(bipy)(CN)4}4] 9H2O CH3OH [bipy=2,2′‐bipyridine] was synthesized. The compound has been characterized by X‐ray structure analysis, elemental analyses, IR spectrum, TGA thermogram and magnetic susceptibility. The complex consists of novel one‐dimensional ladder structure. The crystal belongs to monoclinic system with a space group P21/c. a =1.3946(4) nm, b=2.0450(6) nm. c=2.9722(8) nm. β= 99.W(5), V=8.372(4) nm3, Z=4. Dc= 1.562 g cm−3.
Molecularly Imprinted Polymer with Calix[4]arene Derivative for the Recognition of Acetanilide
Authors: Lu Chun‐Yang , He Hai‐Cheng , He Xi‐Wen , Zeng Xian‐Shunb 
Published: September 2010

AbstractTwo molecularly imprinted polymers binding to analgesic acetanilide were prepared using either dual functional monomers of calix[4]arene derivative and acrylamide or single monomer acrylamide, respectively. The polymers wen ground, sieved and investigated by equilibrium binding experiment to evaluate their recognition properties for the template and other substrates. Scatchard analysis showed that homogeneous recognition sites were formed in the imprinted polymer matrix. Our results demonstrated that the polymer using two functional monomers exhibited better selectivity for the template. This study may open new frontiers for the development and application of imprinted polymers, such as drug separation and purification.
Synthesis of Monodisperse Poly(glycidylmethacrylate‐co‐ethylene dimethacrylate) Beads and Their Application in Separation of Biopolymers
Authors: Gong Bo‐Lin , Ke Cong‐Yu , Geng Xin‐Du 
Published: September 2010

AbstractThe monodisperse poly(glycidyl methacrylate‐co‐ethylene dimethacrylate) beads with macroporous in the range of 8.0–12.0 μn were prepared by a single‐step swelling and polymerization method. The seed particles prepared by dispersion polymerization exhibited good absorption of the monomer phase. The pore size distribution of the beads was evaluated by gel permeation chromatography and mercury instruction method. By using this media, a weak cation exchange (WCX) stationary phase for HPLC was synthesized by a new chemical modification method. The prepared resin has advantages of biopolymer separation, high column efficiency, low column backpressure, high protein mass recovery and good resolution for proteins. The measured bioactivity recovery for lysozyme was (96 5)%. The dynamic protein loading capacity of the synthesized WCX packing was 21.3 mg/g. Five proteins were completely separated in 8.0 min using the synthesized WCX stationary phase. The experimental results show that the obtained WCX resin has very weak hydrophobicity. The WCX resin was also used for the rapid separation and purification of lysozyme from egg white in 8 min with only one step . The purity and specific bioactivity of the purified lysozyme was found more than 92.0% and 70184 U/mg, respectively.
Synthesis and Characterization of Donor‐Acceptor‐Donor Triads Containing Tetrathiafulvalene and Naphthalene Diimide Units: Towards Regulation of the Intermolecular Charge‐Transfer Interaction by Varying the Attached Side Groups
Authors: Guo Xue‐Feng , De‐Qing Zhang , Fan Qing‐Hua , Zhu Dao‐Ben 
Published: September 2010

AbstractA series of donor‐acceptor‐donor triads 1–6 consisting of tetrathiafulvalene and naphthalene diimide units were synthesized and characterized. UV/Vis spectroscopic and cyclic voltammetric studies indicate that these triads show negligible intramolecular charge transfer interaction in the ground state. In contrast to that of the reference compound 36, their fluorescence intensities were reduced in the following sequences: 345612, which is probably due to photoinduced electron transfer in triads 1–6. Two solid forms (yellow and pen) of triads 1–5 were obtained, while only green form for triad 6 was obtained under the same conditions. Studies of the yellow and green forms with UV. XRD and DSC were performed. It was suggested that varying the attached side groups may regulate intermolecular charge transfer interactions in the solid state.
Preparation and Characterization of TiO2‐pillared Layered HNb3O8
Authors: Guo Xian‐Ji , Hou Wen‐Hua , Kong Yan , Ding Wei‐Ping , Fan Yi‐Ning , Yao Tian‐Yang , Yan Qi‐Jie , Chen Yi 
Published: September 2010

AbstractOligomeric titanium(IV) cation ([Ti(OH)x(H2O)y]&z−;)‐intercalated niobate was prepared through a stepwise ion‐exchange mute, in which n‐decylamine was employed as a preswelling agent and titanium isopropoxide as titanium source. Titania‐pillared layered niobic acid was then obtained by calcining oligomeric titanium(IV) cation‐intercalated niobate at 450 °C in air. Characterization of this pillared material indicated that the material had a porous layered structure with an interlayer distance of 1.38 nm and a BET (Brunauer‐Emmett‐Teller) surface area of 34 m2·g−1. The layered structure was still retained after the pillared material was heated at 550 T.
Synthesis and Crystal Structure of a Novel Zincophosphite Containing Two‐dimensional Inorganic‐organic Network
Authors: Yang Ya‐Li , Li Niu , Xiang Shou‐He 
Published: September 2010

AbstractA novel 1,6‐hexamethylenediamine‐zincophosphite has been synthesized hydrothermally. Its single‐crystal structure refinement has shown the zincophosphite with the composition NH+3 (CH2)6 NH+3 [Zn(HPO3)2]2−, Mr= 343.55. It crystallizes in monoclinic, space group C2/c (No. 15). a=2.2391 nm, b=0.8695 nm, c=0.7919 nm, β= 101.062(6)°, V= 1.513 nm3, Dc= 1.508 kg/m3, Z=4, F(000)=712, μ=1.849 mm−1, R1 =0.0416. wR2=O.1023. This phase exhibits infinite inorganic chains of vertex‐linked ZnO4 and HPO3. Via the electrostatic attraction, 1.6‐hexamethylenediamine cations and inorganic chains construct a novel interesting two‐dimensional inorganic‐organic network.
Amperometric Biosensor for Hydrogen Peroxide Based on Electrodeposited Sub‐micrometer Gold Modified Glassy Carbon Electrode
Authors: Wang Shu‐Qing , Chen Jun , Lin Xiang‐Qin 
Published: September 2010

AbstractA new type of hydrogen peroxide amperometric biosensor was fabricated based on electrochemically deposited sub‐micrometer Au particles (sm‐Au) on a glassy carbon electrode (GCE). Electrochemical deposition condition was optimized for obtaining uniformly distributed sub‐micrometer sized Au array on the electrode surface. The hydrogen peroxide sensor was fabricated by adsorbing phenothiazine methylene blue (MB) molecules on the surface of sm‐Au and covering a cross‐linked horseradish peroxidase (HRP) layer, labeled as HRP/MB/sm‐Au/GCE. The characteristics of this biosensor were evaluated with respect to applied potential and pH. The amperometric response of the sensor was linear to the H2O2 concentration over a wide range of 9.9×10−6—1.11×10−2 mol/L. A detection limit (s/n=3) of 3.0×10−6 mol/L H2O2 was estimated for a sampled chronoamperometric detection at 1.5 min after potential step of 200 to −400 mV vs. SCE. The immobilized MB molecules shuttled electrons at α= 0.77 and an apparent electron transfer rate constant of k05 =0.053 s−1. Interference of ascorbic acid, dopamine and uric acid was investigated. This sensor has very good stability and reproducibility for long‐term use.
Factors Influencing Sulfinatodehalogenation Reactions of Perhalocarbons
Authors: Wu Kai , Chen Qing‐Yun 
Published: September 2010

AbstractThe study on the factors influencing sulfinatodehalogenation of perfluorohexyl chloride plus octene‐1 by using Na2S2O4/NaHCO3 discovered that among the various solvents tested (e.g. Me2SO, NMP, DMAc, CH3CN, CH3CN/H2O) at different temperatures, Me2SO was found to be the most suitable solvent and the conversion of the chloride was very dependent on the reaction temperature. When Me2SO was used in the reaction of perfluoroalkyl iodides. the reaction temperature could be decreased by 20 °C as compared with that carried out in CH3CN/H2O to reach the comparable yields.
Synthesis and Crystal Structure of 1D Coordination Polymer of N,N′‐Bis(3‐pyridylmethyl)‐1,4‐benzenedicarboxamide and Cobalt(II) Nitrate
Authors: Ge Chun‐Hua , Zhang Xiang‐Dong , Tong Jian , Zhang Peng , Guo Fang , Liu Qi‐Tao 
Published: September 2010

AbstractA noval cobalt(II) coordination polymer, {[Co(bpmb)(H2O)2(C2H5OH)2]·(NO3)2}‐ (1). where bpmb=N,N′‐bis(3‐pyridylmethyl)‐1,4‐benzenedicarboxamide, was synthesized by self‐assembly of the two topic ligands with cobalt nitrate in ethanol solution, and characterized structurally by X‐ray crystallography analysis. The crystal data belong to triclinic, space group P1 with cell parameters a=0.8911(3) nm, b=0.9042(3) nm, c= 1.0068(3) nm, α= 73.083(5)°, β=81.069(5)°, γ=76.210(5)°, R1=0.0518, wR2=0.0947. The results of structure analysis indicate that each bpmb ligand coordinates two Co(II) atoms and each metal atom is in octahedral coordination geometry with four oxygen atoms of two ethanol and two water molecules, two nitrogen atoms from two different bpmb ligands in trans position forming an infinite 1D chain‐like structure. There BTC hydrogen bonding and π‐π stacking interaction among these chains, leading to supramolecular formation with 3D net structure.
Soluble polymer‐supported synthesis of pyrazoles via 1,3‐dipolar cycloaddition strategy
Authors: Lin Xu‐Feng , Wang Yan‐Guang , Ding Han‐Feng 
Published: September 2010

AbstractRapid parallel liquid‐phase synthesis of pyrazoles has first been developed. The 1,3‐dipolar cycloaddition between nitrilimines generated in situ and soluble polymer‐supported alkynyl or alkenyl dipolarophiles in parallel one‐pot fashion gave the corresponding PEG‐supported regioisomeric pyrazoles or regiospecific pyrazolines. The latter was assuredly oxidated by DDQ to PEG‐supported regiospecific pyrazoles. Cleavage from the support under mild conditions afforded pyrazoles in good yields and high purity.
Promotion of ionic liquid to dimethyl carbonate synthesis from methanol and carbon dioxide
Authors: Cai Qing‐Hai , Zhang Li , Shan Yong‐Kui , He Ming‐Yuan 
Published: September 2010

AbstractPromotion of ionic liquid, 1‐ethyl‐3‐methylimidazolium bromide (emimBr), to the synthesis of dimethyl carbonate (DMC) from methanol and carbon dioxide in the presence of potassium carbonate and less amount of methyl iodide under mild conditions was investigated. The results showed that the high selectivity and raised yield of DMC was achieved due to the addition of emimBr in the reaction system. And effect of several reaction conditions such as Temperature, pressure and amount of emimBr was discussed.
Theoretical studies on electronic spectra and second‐order nonlinear optical properties of barbituric acid derivatives substituted with schiff base
Authors: Sun Gang , Qiu Yong‐Qing , Sun Hai‐Zhu , Su Zhong‐Min , Feng Jing‐Dong , Zhu Yu‐Lan 
Published: September 2010

AbstractThe structures of barbituric acid derivatives substituted with Schiff base were optimized using ab initio HF method at 6‐31G basis set. Based on the optimized structures, the electronic spectra were obtained by INDO/CI method. The second‐order nonlinear optical (NLO) coefficients βμ were calculated according to the sum‐over‐states (SOS) formula. In addition, the effect of conjugation on electronic specra and second‐order NLO coefficients was investigated. The influence of exchange between C and N atoms as well as the substituted effect on the barbituric acid was discussed. It was indicated that the exchange between C and N atoms on Schiff base is important for enhancing the NLO coefficient of the whole molecule with donor and acceptor (D‐A). Meanwhile significant changes in electron donation and acception were observed as substituents changes positions. Among the designed models, molecule lb has maximal βμ value of 124.65×10−‐30 esu. About molecule lb, barbituric acid is considered as an accepted electronic group and the position of N atom on Schiff base is close to it.
Intermolecular Phenolic Hydroxy Methylation Occurring between Chiral N,N′‐Bis(2‐hydroxyphenyl)‐2,2‐dimethyl‐1,3‐dioxolane‐4,5‐dicarbamide and Co‐crystallized Methanol under Electron Impact Ionization Conditions
Authors: Xu Jia‐Xi , Jiao Peng , He Zheng , Zhang Qi‐Han , Yan Chun‐Hua 
Published: September 2010

AbstractAn intermolecular phenolic hydroxy methylation occurring between chiral N,N′‐bis(2‐hydroxyphenyl)‐2,2‐dimethyl‐1,3‐dioxolane‐4,5dicarbamide and co‐crystallized methanol under electron impact ionization conditions was observed. The result was confirmed by X‐ray diffraction structural analysis of a co‐crystalline of (R,R)‐enantiomer and methanol.
Synthesis of Analogues of the Antitumor (1→6)‐Branched (1→3)‐Glucohexaose
Authors: Zeng You‐Lin , Zhang Jian‐Jun , Kong Fan‐Zuo 
Published: September 2010

Abstractβ‐D‐Glcp( 1→3)‐[β‐D‐Glcp‐( 1→6)‐/α‐D‐Manp‐( 1→3)‐β‐D‐Glcp( 1→3)‐[β‐D‐Glcp‐(1→6)‐]D‐Glcp (18) and β‐D‐Glcp( 1→3)‐[β‐D‐Glcp‐( 1→6)‐] α‐D‐Manp‐( 1→3)‐β‐D‐Glcp‐( 1 →3)‐[β‐D‐Glcp‐( 1→6)‐]β‐D‐Glcp‐D‐(1→3)‐Glcp‐1→OMe (29) were synthesized as the analogues of the immunomodulator β‐D‐Glcp‐(1→3)‐[β‐D‐Glcp‐(1→6)‐]α‐D‐Glcp‐(1→3)‐β‐D‐Glcp‐(1→3)‐(β‐D‐Glcp‐(1→6)‐]D‐Glcp through coupling of trisaccharide donors 9 with trisaccharide acceptor 16 and terrasaccharide acceptor 27 followed by deprotection. respectively.
Synthesis of Polymer‐bound Sensitizers and their Applications in the Preparation of Previtamin D3 from Tachysterol
Authors: You Chang‐Jiang , Xie Rong , Gao Yun‐Yan , Han Yong‐Bin , Yang Guo‐Qiang , Li Yi 
Published: September 2010

AbstractTwo kinds of polymer‐bound photosensitizers were synthesized, in which anthracene acts as sensitizer moiety, polystyrene (PS) and poly(methyl methylacrylate) (PMMA) serve as solid phase supports, respectively. The photoisomerization of tachysterol to previtamin D3 was carried out with these polymer‐bound photosensitizers in ethanol and toluene solutions. The experiment results demonstrate that these solid phase photosensitizers are efficient for the photoisomerization with good recycle property and can be simply separated from the reaction mixtures by filtration.
Calculation of two‐center nuclear attraction integrals over slater type orbitals in molecular coordinate system
Authors: Mamedov B. A. 
Published: September 2010

AbstractA closed analytical relation is derived for the two‐center nuclear attraction integrals over Slater type orbitals (STOs) in terms of binomial coefficients. This formula can be used in highly accurate calculations of the nuclear attraction integrals. The relationships obtained are valid for arbitrary values of quantum numbers and screening constants of STOs and location of nuclei.
Ionic liquids as mobile phase additives for separation of nucleotides in high‐performance liquid chromatography
Authors: Zhang Wen‐Zhu , He Li‐Jun , Liu Xia , Jiang Sheng‐Xiang 
Published: September 2010

AbstractIonic liquids are a type of salts that are liquid at low temperature (<100 °C). Because of their some special properties, they have been widely used as new “green solvents” for many chemical reactions and liquid‐liquid extraction in the past several years. In this paper, a new method for the separation of nucleotides is developed and the essential feature of the method is that 1‐alkyl‐3‐methylimidazolium salts are used as mobile phase additives, resulting in a baseline separation of nucleotides without need of gradient elution and need of organic solvent addition as currently used in RP‐HPLC. This study shows the potential application of ionic liquids as mobile phase additives in reversed‐phase liquid chromatography.
Synthesis and conformation ofcis‐1,2‐disubstituted cyclododecene
Authors: Han Xiang‐Yu , Wang Ming‐An , Liang Xiao‐Mei , Wang Dao‐Quan 
Published: September 2010

AbstractEight 1,2‐disubstituted cyclododecenes were synthesized from α‐alkoxycarbonyl‐cyclododecanone and alkyl chloroformate. Their configuration and conformation determined by IR, NMR spectroscopy and X‐ray diffraction analysis showed that the carbon‐carbon double bond of all of the synthesized compounds hascis‐configuration. and the ring skeleton of their preferred conformation is [lene2333] in solid, and they may adopt two different [lene2333] conformations, which exist in a dynamic equilibrium in solution.
Mechanism and Kinetics for the Reaction of NCS and OH Radicals
Authors: Liu Peng‐Ju , Zhao Min , Chang Mng‐Fei , Zhao Yan‐Ling , Su Zhong‐Min , Wang Rong‐Shun 
Published: September 2010

AbstractThe mechanism and dynamical properties for the reaction of NCS and OH radicals have been investigated theoretically. The minimum energy paths (MEP) of the reaction were calculated using the density functional theory (DFT) at the B3LYP/6‐3 11 +G**level, and the energies along the MEP were further refined at the QCISD(T)/6‐311 +G** level. As a result, the reaction mechanism of the title reaction involves three channels, producing HCS+NO and HNC+SO products, respectively. Path I and path LI are competitive, with some advantages for path I in kinetics.As for path 111. it looks difficult to react for its high energy barrier. Moreover, the rate constant have been calculated over the temperature range of 800‐2500 K using canonical variational transition‐state theory (CVT). It was found that the rate constants for both path I and path II are negatively dependent on temperature, which is similar with the experimental results for reactions of NCS with NO and NO*, and the variational effect for the rate constant calculation plays an important role in whole temperature range.
Density functional study on the mechanism of collision reaction among protons, N2 and water vapor
Authors: Sun Hao , Pan Xiu‐Mei , Zhao Min , Liu Peng‐Jun , Su Zhong‐Min , Wang Rong‐Shun 
Published: September 2010

AbstractThe mechanism of collision reaction among protons, N2 and water vapor was theoretically studied using Density Functional Theory. The geometries of reactants, transition states, intermediates and products were optimized at the B3LYP/6‐311+G** level by the BERNY gradient analysis method. Transition states and intermediates have been identified by vibrational frequency analysis. The relationship among reactants, intermediates, transition states and products was affirmed by IRC calculation. The variations of energy and geometry along the IRC determined reaction paths were described. The possible reaction pathways were represented and the optimal one was decided from the viewpoint of energy.
On the correlation between the blue shift of hydrogen bonding and the proton donor‐proton acceptor distance
Authors: Wang Jin‐X , Feng Yong , Liu Lei , Li Xiao‐Song , Guo Qing‐Xiang 
Published: September 2010

AbstractIt is demonstrated that in all types of hydrogen bonds (XH···Y) there is a balance between the long‐range attractive orbital interactions and short‐range Pauli/nucleus repulsions. When the proton acceptor approaches the proton donor from distance, the hydrogen bonding energy becomes more negative at relatively large distance, goes through a minimum. and then starts to become less negative when the short‐range repulsive forces come into effect Meanwhile, the XH bond length increases at relatively large distances, goes through a maximum and starts to shorten when the short‐range repulsive forces come into effect. Whether the hydrogen bond is red or blue shifted is dictated by the energy minimum position. If at the energy minimum position the XH bond length is shorter than that for the free monomer, the hydrogen bond is blue shifted and vice versa. Further studies demonstrate that the recent report about the correlation of CH bond lengths with proton donor‐acceptor distance in F3CH···OH2and F3CH···Cl is not fully correct because the authors conducted an inappropriate comparison. Furthermore, it is shown for the first time that the Pauli/nucleus repulsion theory is applicable to the blue‐shifted hydrogen bonds in the XH···π complexes and the blue‐shifted lithium bonds in the XLi···Y complexes.
Chemical liquid phase deposition of thin aluminum oxide films
Authors: Sun Jie , Sun Ying‐Chun 
Published: September 2010

AbstractThin aluminum oxide films were deposited by a new and simple physicochemical method called chemical liquid phase deposition (CLD) on semiconductor materials. Aluminum sulfate with crystallized water and sodium bicarbonate were used as precursors for film growth, and the control of the system's pH value played an important role in this experiment. The growth rate is 12 nm/h with the deposition at [Al2(SO4)] =0.0837 mol·L−1, [NaHCO3] = 0.214 mol·L−1, 15 °C Post‐growth annealing not only densifies and purifies the films, but results in film crystallization as well. Excellent quality of Al2O3 films in this work is supported by electron dispersion spectroscopy. Fourier transform infrared spectrum, X‐ray diffraction spectrum and scanning electron microscopy photograph.
Synthesis, structure and catalytic activity comparison of tris‐ and tetracoordinated lanthanide amides
Authors: Xie Mei‐Hua , Liu Xin‐Yuan , Wang Shao‐Wu , Liu Li , Wu Yong‐Yong , Yang Gao‐Sheng , Zhou Shuang‐Liu , Sheng En‐Hong , Huang Zi‐Xiang 
Published: September 2010

AbstractTetracoordinated lanthanide amides [(Me3Si)2N]3Ln (μ‐CI)Li(THF)3 (Ln=La (1), Pr (2)) were synthesized by the reaction of anhydrous lanthanide(III) chlorides LnCl3 (Ln=La, Pr) with 3 equiv. of lithium bis(trimethyl‐silyl)amide (Me3Si)2NLi in THF, followed by recrystallization from toluene. Sublimation of 1 and 2 afforded the triscoordinate lanthanide amides [(Me3Si)2N]3Ln (Ln=La, Pr). The crystal structure of 2 was determined by X‐ray diffraction analysis. The catalytic activity studies show that the tetracoordinate amides can be used as single‐component MMA (methyl methacrylate) polymerization catalysts, while the triscoordinate amides showed poor activity on h4MA polymerization under the same conditions.
A novel reductive cyclization of o‐nitrobenzamides and ketones promoted by low‐valent titanium reagent
Authors: Shi Da‐Qing , Rong Liang‐Ce , Wang Ju‐Xian , Zhuang Qi‐Ya , Tu Shu‐Jianga 
Published: September 2010

AbstractA short and facile synthesis of a series of 1, 2‐dihydroquiazolin‐4(3H)‐ones was accomplished in good yields via novel reductive cyclization of o‐nitrobenzamides with ketones promoted by TiCl4/Zn system. The structure was established on the basis of elemental analysis, IR, 'H NMR and confirmed by a single‐crystal X‐ray diffraction analysis. This method has the advantages of easily accessible starting materials, convenient manipulation and moderate to high yields.