bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of Dioxa‐Cages as a New Probe for the Stereochemistry of the Bisadducts of p‐Quinone with Cyclopentadiene and Cyclohexadiene
Authors: Yen Chia‐Hui , Tsai Shih‐Hwa , Wu Hsien‐Jen 
Published: May 2015

AbstractThe synthesis of dioxa‐cages via iodine‐induced cyclization reaction can be used as a new method for the determination of the stereochemistry of the bisadducts of p‐quinone with cyclopentadiene and cyclohexadiene. The bisadducts 2 and 8 were converted into the dioxa‐cages 13a and 13b via a three‐step sequence, respectively. The stereochemistry of 13a and 13b was determined on the basis of NOE experiments.
Oxidation of Hydrazides Using Sodium Perborate: Formation of N,N‐Diacylhydrazines
Authors: Jadhav Vidyadhar K. , Wadagaonkar Prakash P. , Salunkhe Manikrao M. 
Published: May 2015

AbstractSubstituted aromatic hydrazides react very smoothly with sodium perborate in glacial acetic acid at room temperature to give N, N′‐diacylhydrazines in excellent yields and purity.
Spin State in (Porphinato)iron(III) Complex. A Spin‐Crossover Complex with Two Magnetically Distinct Sites
Authors: Dong Teng‐Yuan , Cheng Ching‐Hung , Chang Ling‐Shao , Wang Yu 
Published: May 2015

AbstractThe results of low temperature X‐ray determination, Mössbauer and magnetic measurement of spin‐crossover (isothiocyanato)(porphinato)iron(III) hemipyridine are reported. The features in 77 K Mössbauer spectrum include two doublets, one with a quadrupole splitting (ΔEQ) of 1.961 mm s−1 (low‐spin site) and the other with ΔEQ = 0.792 mm s−1 (high‐spin site). As the temperature of the sample is increased to 300 K, the signal intensity of the high‐spin site grows to 92% at the expense of the low‐spin signal. The variable‐temperature magnetic susceptibility data also support that the tetraphenyl complex is a spin‐crossover complex.
Synthesis of Pyrido[2,3‐d]pyrimidines via the Reaction of Activated Nitrites with Aminopyrimidines
Authors: Geies Ahmed A. 
Published: May 2015

Abstract6‐Aminouracil and 6‐aminothiouracil (1a, b) were reacted with benzylidenemalononitrile 2a to afford the pyrido[2,3‐d]pyrimidines 4a, b. On the other hand, the reaction of 1a, b with benzylidene ethyl cyanoacetate 2b result in a mixture of 5a,b and/or 6a,b respectively. Pyrido[2,3‐d]thiazolo[1,2‐b]pyrimidines 8a‐c were synthesized from the reaction of 4b with α‐halo compounds to give the intermediate derivatives 7a‐c followed by cyclization using 70% H2SO4.
New and Simple Syntheses of the Attractants of the Female Melon Fly, Dacus cucurbitae
Authors: Yen Yao‐Pin , Chen Pao‐Hsing 
Published: May 2015

AbstractThe attractant of the female melon fly, (E)‐6‐nonenyl acetate, and the two analogs, (E)‐7‐dodecenyl acetate and (E)‐7‐decenyl acetate were synthesized via hydrozirconation to control the regioselective coupling reactions and resulted in good yields.
Synthesis of New 2‐[(Substituted‐pyrazolin‐1‐yl)carbonyl]‐thieno[2,3‐b]pyridine Derivatives
Authors: Ho Yuh‐Wen 
Published: May 2015

AbstractThe reaction of 3‐amino‐4,6‐dimethyl‐2‐thieno[2,3‐b]pyridine carbohydrazide (1) with appropriate chalcones 2a‐2d in the presence of acid catalyst produced the corresponding 3‐amino‐2‐[(3,5‐disubstituted‐pyrazolin‐1‐yl)carbonyl]‐4,6‐dimethylthieno[2,3‐b]pyridines 3a‐3d. 3‐Amino‐2‐[(3‐substituted‐pyrazolin‐1‐yl)carbonyl]‐4,6‐dimethylthieno[2,3‐b]pyridines 7a, 7b were also obtained by the cyclization reaction of carbohydrazide 1 with Mannich base derivatives 6a, 6b under basic condition.
Reaction of 4‐Aryl‐3‐thiosemicarbazides with Phenylisothiocyanate: A Facile Synthesis of Thiazole, Pyrazole and Pyrimidine Derivatives
Authors: Wardakhan Wagnat W. , Fleita Daisy H. , Mohareb Rafat M. 
Published: May 2015

AbstractThe reaction of 4‐aryl‐3‐thiosemicarbazides 1a‐d with phenylisothiocyanate gave the intermediate potasium salts 2a‐d. The latter afforded 3a‐d, 13a‐d and 19 upon the reaction with phenacyl bromide, monochloroacetic acid and ethyl bromocyanoacetate respectively.
A Novel Quality Criteria for Optimization of Chromatographic Multicomponent Separations
Authors: Yang Jyisy , Chen Yi‐Fen 
Published: May 2015

AbstractThis study presents a Chromatographic Optimization Function (COF) to optimize chromatographic separation conditions. The COF proposed herein provides several advantages over conventional COFs, including the ability to eliminate the ambiguous selection of the weighting factors and easily obtain the acceptable or maximum resolution in the shortest separation time. The parameters used to construct this COF are in the form of sigmoidal functions to reduce the weight of the response for less acceptable conditions and to filter out undesired situations. In addition, resolution between peaks, length of separation time, and number of peaks separated are used as parameters for constructing the proposed COF. Closely examining the performance of the COF for both simulated and experimental chromatographic separations reveals an adequate correlation with human judgment and, also, creates no problems in selecting weighting factors.
Electrocatalytic Reactions by an Iron Porphyrin/Polypyrrole Modified Electrode Monitored by Electrochemical Quartz Crystal Microbalance
Authors: Liu Mao‐Huang , Oliver Su Y. 
Published: May 2015

AbstractElectropolymerization of pyrrole in aqueous solution is monitored by electrochemical quartz crystal microbalance (EQCM) during potential scan. The film formation process on the electrode is reflected by the frequency decrease for the quartz oscillator as a function of time. The film growth rate is greatly enhanced in the presence of iron(III) meso‐tetrakis(3‐sulfonatomesityl)porphyrin, which carries 3‐ of charge. The metalloporphyrin is trapped and remains intact in the polypyrrole films. The ion transport property through the iron porphyrin/polypyrrole film is the reverse of that for pure polypyrrole. Electroreduction of dioxygen and electrooxidation of alkenes are parallel to those in the solution state.
Direct Solid Phase Synthesis of Biologically Active Peptide Alcohols
Authors: Wu Ying‐Ta , Hsieh Hsing‐Pang , Chen Shui‐Tein , Wang Kung‐Tsung 
Published: May 2015

AbstractNew procedures have been developed for the synthesis of peptide alcohols, such as octreotide conjugates, fragment of gramicidin, and fragment of Trichorzianines in high yield using dihydropyran‐2‐carboxylic acid as a bifunctional linker to anchor Fmoc‐threoninol(But), Fmoc‐glycinol, and Fmoc‐phenylalaninol onto amine‐resins. The linker is stable during peptide elongation as evidenced by a high yield at each coupling step. The octreotide disulfide bonds were formed on‐resin by incubating the elongated octreotide/resin with Tl(TFA)3/DMF at 0 °C for 1 hour. Tl(TFA)3/DMF is sufficiently mild that the protecting group and the linker remain intact and allow further the direct coupling of conjugates to octreotide using an autosynthesizer.
Kinetic Study of the Isotope Exchange Reactions of Malonic Acid and Malonate Ion Using 1H NMR Spectroscopy. Inhibition of Acid and Base
Authors: Hsu Ming‐Ching , Jwo Jing‐Jer 
Published: May 2015

AbstractThe isotope exchange reactions of malonic acid and a malonate ion were investigated in acidic and basic D2O solutions, respectively, using 1H NMR spectroscopy. The isotope exchange reaction of malonic acid is inhibited by the presence of DNO3 (0–3 M) and DSO4− ion (0–0.1 M), whereas it is catalyzed by the presence of DSO4− ion (> 0.2 M), D3PO4, D2PO4− ion or DPO42– ion. The order of relative reactivity for catalyzing the isotope reaction of malonic acid in D2O is DPO42– > D2PO4− > D3PO4 > DSO4− > DNO3. The rate of the isotope exchange reaction of malonate ion in D2O decreases to a minimum and then increases with increased [NaOD]0. The mechanism of the isotope exchange reaction of malonic acid in acidic D2O is different from the general acid‐catalyzed mechanism generally observed for organic acids like acetic and dichloroacetic acids. The bimalonate ion plays an important role in the isotope exchange reactions of this system.
Synthesis, Crystal Structure and Electrochemical Behavior of a Fe(II) Complex of 8‐Mercaptoquinoline (Hmtq) with Trimethylphosphite Participation
Authors: Tong Ye‐Xiang , Kang Bei‐Sheng , Chen Xiao‐Ming , Yu Xiao‐Lan 
Published: May 2015

AbstractThe mononuclear complex Fe(II)(mtq)2{P(OCH3)3}2 (Hmtq = 8‐Mercaptoquinoline) with mixed N‐heterocyclic thiolato and phosphite ligands was synthesized and characterized by X‐ray crystallography and cyclic voltammetric measurement. The title complex crystallizes in the triclinic space group P‐1 with a = 8.929(4), b = 9.965(3), c = 16.913(11) Å, α = 76.21(10), β = 80.89(10), γ= 68.010(10)°, V = 1351.2(11) Å3. The Fe(II) atom exhibits an elongated octahedral geometry composed of N2S2P2 donors. The equatorial plane is made up of two cis‐oriented N donors from the thiolato ligands and two cis‐oriented monodentate P(OCH3)3 ligands. The apical sites are occupied by two trans‐oriented S atoms from the mtq− ligands. The thione form is predominant coordination mode of 8‐mercaptoquinoline with the N and S donors bound to the Fe(II) to form five‐membered chelate rings. The structural feature of the mononuclear Fe(II) complex with mixed phosphite and thiolate ligands is summarized.
Synthesis of PrBa2Cu4O8 by Solution Method under Ambient Oxygen Pressure
Authors: Huang J. C. , Cheng C. H. , Chen Y. F. , Sheen S.R. , Lee Z. L. , Shao H. Y. , Wu M. K. 
Published: May 2015

AbstractA highly homogeneous and nearly monophasic PrBa2Cu4O8 compound has been synthesized at 1 atm of oxygen via a route employing polymeric ethylenediamine/citric acid precursors. The PrBa2Cu4O8 compound with a trace amount of BaCuO2 was synthesized for the first time by sintering the pellets at the temperature of 875 °C under ambient oxygen pressure. The temperature coefficient of the resistivity is positive below 190 K while above 190 K is negative. The superconducting transition was not detected down to 4.2 K. Samples were characterized by X‐ray diffraction, scanning electron microscopy, thermal analysis, and transport and magnetic measurements.
Studies on the Synthesis, Crystal Structure and Antitumor Activities of Mn(II) Complex Derived from the Desulfurization of N‐(p‐nitrophenyl)‐N′‐(methoxycarbonyl)thiourea and o‐Phenanthroline
Authors: Shen Xu , Shan Jun , Sun Hong‐Bao , Kang Bei‐Sheng 
Published: May 2015

AbstractOne new Mn(II) complex, 1, MnL2(phen)2 (L = p‐nitrophenylcyanamido‐N, phen = o‐phenanthroline) has been synthesized and crystallographically characterized. Complex 1 was obtained from the desulfurization and hydrolysis of H2pmt (H2pmt = N‐(p‐nitrophenyl)‐N′‐(methoxycarbonyl)thiourea) in alkaline media. 1 crystallized in the triclinic space group P‐1 with a = 11.0320(3), b = 11.7831(4), c = 12.9288(4) Å; α = 87.3590(10), β = 81.7500(10), γ= 84.0080(10)°. Preliminary pharmacological tests showed that complex 1 exhibited definite inhibition activities against human ovary tumor 3A0 and mice P388 in vitro.
Isocalamenenes from the Liverwort Bazzania tridens
Authors: Chang Ran‐Chien , Wu Chia‐Li 
Published: May 2015

AbstractFour new sesquiterpenoids, 1,4‐trans‐6‐hydroxyisocalamenene; 1,4‐trans‐6‐methoxyisocalamenene; (+)‐aristol‐9‐en‐ 12β‐ol, and eudesm‐4(15)‐en‐6β‐acetoxy‐7β‐ol, were isolated from Bazzania tridens, a liverwort species. Their structures were identified by means of spectroscopic methods. The two isocalamenenes are derived from a methyl rearrangement of the calamenene skeleton.
New Sesquiterpenes from a Taiwanese Marine Sponge of the Genus Parahigginsia
Authors: Shen Ya‐Ching , Chen Chin‐Yeu , Dun Chang‐Yin 
Published: May 2015

AbstractAn undescribed Taiwanese marine sponge of the genus Parahigginsia yielded two new sesquiterpene hydrocarbons‐parahigginine (1) and parahigginone (2). The structures of the new compounds were established on the basis of NMR spectroscopic and mass spectrometric data. Compounds 1 and 2 exhibited moderate cytotoxicity against murine P‐388 and human KB‐16, A‐549, and HT‐29 tumor cells.
Synthesis of Pyrrolidine Derivatives by the Palladium‐Catalyzed Cyclization of N‐(2‐Cyclohexenyl)bromoacetamide Derivatives
Authors: Yang Shyh‐Chyun , Tseng Fu‐Hsiung , Hung Chung‐Wei 
Published: May 2015

AbstractN‐(2‐Cyclohexenyl)bromoacetamide derivatives underwent intramolecular cyclization to give pyrrolidine derivatives in the presence of a base and a catalytic amount of palladium catalyst.
Studies of an Alkaline Activated Glassy Carbon Electrode on the Determination of Purines and DNA
Authors: Tang Tzyh‐Chyang , Huang Hsuan‐Jung 
Published: May 2015

AbstractPerformance of glassy carbon electrode on the determination of purines and DNA was found to be improved dramatically by activating the GCE with a simple but effective electrochemical pretreatment. Characteristics such as lowering of oxidation potential, enhancement of peak current and elimination of fouling effect were found for the activated GCE. By flow injection analysis, good reproducibility with relative standard deviations of 0.59 and 2.01% (n = 11) and rather low detection limits of 0.6 + 0.1 and 3.0 ± 0.4 nM can be obtained for the analysis of guanine and adenine. Solutions of denatured calf thymus DNA were analyzed by differential pulse voltammetry with the activated GCE. Good agreement between the obtained results and the known values confirms the feasibility of the activated GCE for DNA analysis.
Design and Synthesis of Carbohydrate Mimetics: A New Strategy for Tackling the Problem of Carbohydrate‐Mediated Biological Recognition
Authors: Wong Chi‐Huey 
Published: May 2015

AbstractCarbohydrates have been known as poor candidates for drug development. Recent studies have, however, shown that structurally simplified small molecules as mimics of complex carbohydrates recognized by receptors can be developed as inhibitors of carbohydrate‐mediated biological recognition. In addition, small molecules with higher affinity and specificity than the parent ligands can be developed by incorporating additional hydrophobic or charged groups in the carbohydrate mimetic which contains essential functional groups for receptor binding. Representative examples are illustrated in the studies of sialyl Lewis x ‐ selectin interactions, glycosidase and glycosyltransferase reactions and aminoglycoside antibiotic ‐ RNA interactions.
Chiral Ruthenium‐Oxo Complexes for Enantioselective Epoxidation of trans‐Stilbene
Authors: Yu Wing‐Yiu , Fung Wai‐Hong , Zhu Jia‐Ling , Cheung Kung‐Kai , Ho Kwok‐Keung , Che Chi‐Ming 
Published: May 2015

AbstractTwo oxoruthenium(IV) complexes containing C2 symmetric 1,1′‐biisoquinoline (biqn) and (R,R)‐3,3′‐(1,2‐dimethylethylenedioxy)‐2,2′‐bipyridine (diopy*) were prepared, and both are active oxidants for alkene epoxidations. The oxidation of styrene and cis‐ and trans‐β‐methylstyrenes by [(Cn)(diopy*)‐RuIV(O)](ClO4)2 did not proceed enantioselectively, but the same oxidant can attain a moderate enantioselectivity of 33%ee for the trans‐stilbene oxidation to trans‐stilbene oxide. A head‐on approach model, where the C=C is directed from the top to the O=Ru moiety, is proposed to account for the facial differentiation of the trans‐stilbene oxidation.
Microwave‐Assisted Solid Reaction: Reduction of Ketones Using Sodium Borohydride
Authors: Chen Same‐Ting , Yu Hui‐Ming , Chen Shui‐Tein , Wang Kung‐Tsung 
Published: May 2015

AbstractA general and efficient procedure for microwave‐assisted reduction of liquid and solid ketones using sodium borohydride without solvents is described. The added support can enhance both the efficiency and chemoselectivity of reduction.
Velocity Mapping Studies of Vibrational Energy Disposal Following Methyl Iodide Photodissociation
Authors: Parker David H. , Kitsopolous Theofanis 
Published: May 2015

AbstractIn this paper previous results are compared for two different types of velocity mapping studies which probe vibrational energy disposal following the A‐band photodissociation of methyl iodide, CH3I + hv → CH3 (v) + 1(2P3/2), 1*(2P1/2). Full three‐dimensional state‐specific speed and angular distributions of the nascent fragments have been recorded for the photoelectrons, iodine atoms, and methyl radicals, using state‐ and mass‐selective (2+1) resonance‐enhanced multi‐photon ionization (REMPI)/time‐of‐flight spectrometry. Two sources of information on the vibrational energy disposal are available from velocity mapping: (a) the photoelectron images, which give information on the initial stages of vibrational excitation in electronically excited CH3I, and (b) methyl radical images, which indicate the final energy disposal channels. Even though the two signals are believed to probe very different time‐scales of the dissociation process, good agreement between the two is found for the vibrational energy disposal trends. Several trends found in the data for methyl iodide photodissociation indicate that readjustment of the ab initio multi‐dimensional potential energy surfaces calculated for this molecule appears to be needed.
Determination of Stability Constants of Metal Complexes by Capillary Electrophoresis
Authors: Allen Chang C. , Chen Chang‐Yuh , Chen Huan‐Yuan 
Published: May 2015

AbstractThe stability constants of several divalent first row transition and trivalent lanthanide metal complexes were determined by capillary electrophoresis (CE) methods. Four different approaches, i.e. direct formation, ligand exchange, metal exchange and metal‐ligand double exchange were developed. To verify if these CE methods are indeed applicable, the stability constant of CuHEDTA was re‐determined to be 17.47 ± 0.20 (consistent with the published 17.50) using the CuEDTA and ZnHEDTA metal‐ligand double exchange approach. The stability constants of lanthanide (Ce3+ and Eu3+) and transition metal (Ni2+ and Zn2+) complexes of an aminopolycarboxylate ligand, DO2A (1,7‐dicarboxymethyl‐1,4,7,10‐tetraazacyclododecane) were measured under the direct complex formation condition. The stability constant of the NiDO2A complex was determined by the ligand exchange method using 1,4,8,11‐tetraazaundecane (2,3,2‐tet) as the competing ligand. The stability constant of CuDO2A complex was determined by the metal exchange method using Zn2+ ion as the competing metal ion, and complex formation competitions of Ni2+ and Cu2+ between DO2A and 2,3,2‐tet were studied by the metal‐ligand double exchange method. Effects of experimental conditions and the advantages and limitations of these CE methods are discussed.
Syntheses and Characterization of Molybdenum Complexes with the (1,3‐Dithioliumyl)diphenylphosphine Containing Ligands
Authors: Yih Kuang‐Hway 
Published: May 2015

AbstractTreatment of [Et4N][Mo(CO)5(PPh2CS2)], 1 with unsaturated organic halides afforded the neutral complexes Mo(CO)5(PPh2CS2R) (R = CH2CN, 2; R = CH2C≡CH, 3). Alkylation reactions take place at the sulfur atom. Protonation of complex 2 and 3 with HBF4 produced the intramolecular cyclization products [Mo(CO)5(PPh2CS2C2H3N)][BF4], 4 and [Mo(CO)5(PPh2CS2C3H4)][BF4], 5, respectively. In complex 4 and 5, two five‐membered 1,3‐dithiolium rings formed. Protonation of 3 to 5 is not reversible, but deprotonation of 4 by n‐BuLi or PPh3 gave 2 quantitatively. Treatment of 4 with n‐Bu4NF yielded complex Mo(CO)5PPh2F, 6 and 2 with 1:1 ratio, but in the reaction of 5 and n‐Bu4NF only compound 6 was formed. All of these complexes are identified by spectroscopic methods.
Dimolybdenum Complexes Containing Pairs of Bridging Diphosphine and Carboxylate Ligands. Synthesis and Structures of trans‐Mo2(O2CCH3)2(μ‐dppa)2(BF4)2 and trans‐Mo2X2(O2C(CH2)nCH3)2(μ‐dppa)2 (n = 2, 10 or 12; X = Cl or Br; dppa = N,N‐Bis(diphenylphosphino)amine)
Authors: Tseng Gwo‐Wei , Suen Maw‐Cherng , Chen Jhy‐Der , Hwang Jiunn‐Jer , Chen‐Yang Yui Whei , Keng Tai‐Chiun , Wang Ju‐Chun 
Published: May 2015

AbstractThe red complex trans‐Mo2(O2CCH3)2(μ‐dppa)2(BF4)2, 1, was prepared by reaction of [Mo2(O2CCH3)2(CH3CN)6][BF4]2 with dppa (dppa = Ph2PN(H)PPh2) in THF. The reactions of Mo2(O2C(CH2)nCH3)4 with dppa and (CH3)3SiX (X = Cl or Br) afforded the complexes trans‐Mo2X2(O2C(CH2)nCH3)2(μ‐dppa)2 (X = Cl, n = 2, 2; X = Br, n = 2, 3; X = Cl, n = 10, 4; X = Cl, n = 12, 5). Their UV‐vis, IR and 31P{1H}‐NMR spectra have been recorded and the structures of 1, 2 and 3 have been determined. Crystal data for 1: space group P21/n, a = 12.243(1) Å, b = 17.222(1) Å, c = 13.266(1) Å, β = 95.529(1)°, V = 2784.1(6) Å3, Z = 2, with final residuals R = 0.0509 and Rw = 0.0582. Crystal data for 24CH3Cl2: space group P21/n, a = 13.438(1) Å, b = 19.276(1) Å, c = 14.182(1) Å, β = 111.464(1)°, V = 3418.9(6) Å3, Z = 2, with final residuals R = 0.0492 and Rw = 0.0695. Crystal data for 3·4CH2Cl2: space group P21/n, a= 13.579(1) Å, b = 19.425(1) Å, c = 14.199(1) Å, β = 111.881(2)°, V = 3475.6(7) Å3, Z = 2, with final residuals R = 0.0703 and Rw = 0.0851. Comparison of the structural data shows that the effect of the axial ligand on weakening the Mo‐Mo bond strength is X− > CH3CN > BF4−. The Tm values are 121.7 °C for 2, 111.1 °C for 3 and 91.5 °C for 5, respectively.
Synthesis and Pyrolytical Solid‐Phase Structural Transformations of New Oxorhenium(V) Complexes with 2‐Benzoxazolethione
Authors: Mashaly Mahmoud M. , El‐Behairy Mostafa , Khalil Saied M. E. 
Published: May 2015

Abstract2‐Benzoxazolethione reacts with the parent oxorhenium(V) complex, H2[ReOCl5], to yield either mononuclear or dinuclear complexes depending on the metal: ligand molar ratio and the concentration of hydrochloric acid containing the parent rhenium complex. The mononuclear complexs [ReOLCl(OH2)3]Cl2, [ReOL2(OH2)3]Cl3 and [ReOLCl3(OH2)]; and dinuclear complexes [Re2O3(μ‐L)2Cl4]·2H2O and [Re2O2(μ‐L)L2Cl6]‐2H2O were obtained. Both types of complexes have octahedral configurations. The mononuclear complexes prepared in 6N HCl or in 9N HCl undergo irreversible one‐step solid‐phase thermochromism transformation, thus, the colour of complexes changed from green to brown, black or bluish‐green, upon heating. For the complexes obtained in 6N HCl, this step corresponds to structural changes due to the formation of other types of dinuclear complexes, while the mononuclear complex obtained in 9N HCl changes to another mononuclear complex with different coordination sites. On the other hand, the colour of the dinuclear complexes prepared in 2N HCl changed from brown to black, upon heating, in one step solid‐phase thermochromism transformation corresponding to a change in the mode of coordination sites of the organic ligand. All thermal products obtained have octahedral configurations. The ligand behaves in these complexes either as a neutral, mono‐, bidentate or monoanionic bidentate towards the oxorhenium ions. All complexes and the corresponding thermal products were isolated and their structures were elucidated by elemental analyses, conductance, IR and electronic absorption spectra, magnetic moments, 1H NMR and TG‐DTA measurements as well as by mass spectroscopy.
Assessing the Apparent Effective Thickness of the Supported Hybrid Bilayer Membranes Consisting of Octadecanethiol and Phospholipid by ac Impedance Spectroscopy
Authors: Cui Xiaoli , Jiang Dianlu , Diao Peng , Li Junxin , Jia Zhenbin , Tong Ruting , Wang Xinkui 
Published: May 2015

AbstractThe electrochemical behavior of the gold electrode modified by hybrid bilayer membranes in different concentrations of Fe(CN)63−/Fe(CN)64− was investigated by electrochemical impedance spectroscopy and cyclic voltammetry technology. The electron transfer between gold and the redox species separated by the hybrid bilayers assembly was completed by an electron tunneling process. A detailed equivalent circuit for electron transport across the HBMs is proposed. It was found that the apparent effective thickness of the hybrid bilayer membranes was lower than that of the sum of the chain length of octadecanethiol and phospholipid so some possible collapsed sites might exist at the hybrid bilayer membranes.