bluuebunny/crossref_metadata_2025_split huggingface dataset:
Photoinduced intramolecular electron transfer and charge separation in zinc phthalocyanine‐viologen linked system
Authors: Shen Shu‐Yin , Liu Ji‐Xiang , Zhou Qing‐Fu , Xu Hui‐Jun , Takanae N. , Kuriyama Y. , Sakurai H. , Tokumaru Y. 
Published: September 2010

AbstractPhotoinduced electron transfer and charge separation processes in zinc phthalocyanine‐viologen linked system have been studied and the distance effect of donor/acceptor on electron transfer reaction is discussed. It is indicated that the fluorescence from the zinc phthalocyanine moiety is appreciably quenched and the life‐time of singlet excited state is reduced by the pendant viologen. Time‐resolved transient absorption spectra measurements show that intramolecular quenching of the triplet state of zinc phthalocyanine by the attached viologen results in charge separation giving reduced viologen radical alive for a rather long period with hundred microsecond duration. The effect of the carbon chain length on the electron transfer rate constant and charge separation efficiency suggests that upon excitation, the zinc phthalocyanine and viologen groups tend to take closer conformation with the increase of the carbon chain examined. The rate constant for the intramolecular electron transfer ket with n = 3 to 10 is in the order of 104 s−1 and increases.
Study on the synthesis and crystal structure of tetrahyhrated tetraaquotris(4‐mono‐chloroacetylantipyrine)samarium (III) perchlorate
Authors: Xu Xing‐Ling , Tang Zong‐Xun , Guo Zhi‐Zheng , Chen Yun‐Sheng , Shi Ni‐Cheng , Ma Zhe‐Sheng , Han Yu‐Zhen 
Published: September 2010

AbstractBased in the phase equilibrium study of the system Sm(C1O4)3‐4‐monochloroacetytantipyrine (C13H13ClN2O2)‐H2O at 30°C, we have synthesized the title complex [Sm(C13H13Cl‐N2O2)3(H2O)4](ClO4)3‐4H2O. The single crystal structure analysis on RASA‐IIS Rigaku diffractometer shows that the coordination number of the metal ion is nine and the geometry of the complex is tricapped trigonal prism. Two of the three molecules of organic ligand act as bidentate chelated through both carbonyl oxygens to the metal ion, but the other one as a monodentate coordinated only through the ring carbonyl oxygen, the side chain carbonyl is far away from the central ion. The crystal is monoclinic, space group P21, α = 18.013(4), b = 14.709(3), c = 10.536(3) Å, β=94.69(2)°, V=2782(1) Å3, Z=2.
Rate equation of gelation of chromium(III)‐polyacrylamide sol
Authors: Wang Guang‐Xin , Wang Zhi‐Hong , Chen Zhong‐Qi , Chen Li‐Dian 
Published: September 2010

AbstractDuring gelation, the time dependence of the apparent viscosity has been used to analyze the kinetics of the gelation of polyacrylamide (PA) sol with chromium (III) ions. The investigations have stablished the following facts: Before gelation the relation between the viscosity, η, of Cr(III)‐PA sol and the PA concentration is η = f([PA]) = 2.36×1015 [PA]3.15 and the rate equation of gelation in the steady‐state stage during gelation is expressed as Vn = ks f([PA]) [PA]2 [Cr(III)]2.
Sensitive analysis of amino acids in injection liquor by reversed‐phase HPLC
Authors: Shang Zhen‐Hua , Yu Yi‐Nian , Guo Wei , Jiang Hui , Zhou Liaug‐Mo 
Published: September 2010

AbstractA convenient derivatization method of amino acids with l‐fluoro‐2,4‐dinitrobenzene as reaction reagent and a separation system were described. The derivative amino acids were separated on a specific chemically bonded phase column with a simple linear gradient elution consisting of aqueous buffer and methanol. The eluate was detected by common ultraviolet absorption detector at 360 nm. The detection limits of amino acids were as low as 10 picomole. This method has been successfully applied to assay amino acid injection liquor used in hospital. It has good reproducibility and precision. The procedures avoid the requirements of particular derivative equipment and analyzer employed in conventional amino acid analysis.
A modified simplex method for multifactor optimization of selectivity in gas chromatography
Authors: Wang Qin‐Sun , Zhu Chang‐Shou , Yan Bing‐Wen 
Published: September 2010

AbstractA computer‐assisted advanced simplex method is presented for the simultaneous optimization of multifactor ( stationary phase loading, carrier gas flow rate and column temperature ) for separation of ten compounds in gas chromatography. A three factors factorial design was used. The method was based on a special polynomial established from fifteen preliminary runs, using resolution as the selection criterion, with connection to a general simplex method. Excellent agreement is found between the predicted data and the experimental results, and most of experiments required in the general simplex method can be omitted.
Reaction kinetic behavior of different carbon monoxide adspecies on palladium—alumina during oxidation: An in‐situ IR study
Authors: Cao Geng‐Yu , Jiang Biug‐Nan 
Published: September 2010

AbstractCarbon monoxide oxidation on Pd(10 w.t.%)‐alumina was studied by in‐situ infrared spectroscopy. It was found that the oxidation reactivities vary with different CO adspecies: linear COad > 2‐fold bridged COad > multi‐bridged COad.
Study on the inclusion compound of β‐cyclodextrin with (η5‐cyclopentadienyl)tricarbonylmanganese(0)
Authors: Song Le‐Xin , Meng Qing‐Jin , You Xiao‐Zeng 
Published: September 2010

AbstractThe supramolecular inclusion compound of β‐cyclodextrin (β‐CD, host) with (η5‐cyclopentadienyl)tricarbonylmanganese [MnCp(CO)3, guest] was obtained in a crystalline state. The host‐guest compound is thermally stable and do not liberate the guest on heating at 100°C in vacuum. It was characterized by elemental analysis, 1H NMR, differential scanning thermal (DSC) analysis and TLC. Continuous variation plot by NMR method shows that β‐CD formed 1:1 inclusion compound with MnCp(CO)3. On the basis of 1H NMR spectra and the model building with Corey Pauling Koltum (CPK) models, the most probable inclusion mode is proposed.
Application of silver electrode to the electrochemical studies of hemoglobin
Authors: Li Gen‐Xi , Liao Xiang‐Min , Fang Hui‐Qun , Chen Hong‐Yuan 
Published: September 2010

AbstractSeveral aspects of the application of silver electrode to the electrochemical studies of hemoglobin have been discussed in this paper. The silver electrode could not only be used directly as the electrode for the electrochemical studies of hemoglobin, but also react with phenothiazine and benzimidasole to give stable and useful mediator‐coated electrodes. In addition, the silver electrode could help sodium dodecyl sulfate to give full play to its promoting effect on the protein.
Electron transfer in phosphorylated peptide—Study of laser photolysis on N‐dipp‐TrpH‐TyrOH peptide
Authors: Wang Zhi‐Yong , Zhang Zhi‐Cheng , Zhang Man‐Wei , Yao Si‐De , Luo Jian , Wang Wen‐Feng , Zhang Jia‐Shan , Lin Nian‐Yun 
Published: September 2010

AbstractThe laser photolysis of N‐diisopropyl phosphoryl tryptophyl tyrosine dipeptide methyl ester (N‐DiPP‐TrpH‐TyrOH) has been carried out utilizing a KrF(248 nm) laser. The direct intramolecular ET between TrpH+ residue and TyrOH residue was detected first and the ET bet‐ween Trp and TyrOH became slow. It was suggested that phosphoryl group stabilize neighbour radical of aromatic ring by hyperconjugation. In combination with computer modeling we obtained the kinetic parameters of the ET and proved that phosphoryl groups took part in the process of ET. The results should be significant for biological system since every biological process involves the phosphorylation or nonphosphorylation.
Synthesis and light absorption of benzotellurazole crown ether cyanine dye
Authors: Luo Xue‐Hong , Liu Xiu‐Fang , Xu Han‐Sheng 
Published: September 2010

AbstractVarious methods for synthesis of 2‐methyl‐5,6‐(1,4,7,10,13‐pentaoxatridecamethylene)benzotellurazole (8) are described. Under different conditions, alkylation of compound 8 with methyl iodide gave telluronium salt 1,2‐dimethyl‐5,6‐(1,4,7,10,13‐pentaoxatridecamethylene)benzotellurazolium iodide (15) or quaternary ammonium salt 2,3‐dimethyl‐5,6‐(l,4,7,10,13‐pentaoxatridecamethylene)benzotellurazolium iodide (14) in high yields, repectively. The cyanine dye 3,3'‐dimethyl‐5,6,5',6'‐bis(1,4,7,10,13‐pentaoxatridecamethylene)telluracarbocyanine iodide (16) is obtained by condensation of 14 with ethyl orthoformate in acetic anhydride. The visible absorption of the cyanine dye is also discussed.
Synthesis of 1‐acyl‐5‐aryl biurets
Authors: Zou Jian‐Ping , Lu Zhong‐E , Chen Ke‐Qian 
Published: September 2010

AbstractFourteen new 1‐acyl‐5‐aryl biurets were synthesized by the reaction of aryl ureas with acylisocyanates. The latter was obtained from acyl chloride and lead cyanate in dichloromethane, using pyridine as catalyst. The structures of compounds 3a–‐n were confirmed by IR, 1H NMR and MS spectra.
Recognition‐improved monolayer formation on air‐water interface
Authors: Chai Xiang‐Dong , Chen Si‐Guang , Zhou Yong‐Liang , Zhao Ying‐Ying , Li Tie‐Jin , Lehn Jean‐Marie 
Published: September 2010

AbstractMolecular recognition mechanism was introduced into the monolayer formation of two barbituric derivatives, B1 and B2. on a series of melamine derivatives containing water subphase. The recognition pattern was found that each barbituric(or melamine) group forms 3‐fold H‐bonds on its two edges, respectively, with two of its neighboring melamine(barbituric) cores in the ratio of 1:1 on air‐water interface. The area per molecule in this pattern is about 60–65 Å2 for both B1 and B2. Such recognition improves the monolayer formation of B1 by increasing the collapse pressure around 20 mN/M and modulates the intermolecular distance of B2 in monolayer These effects should be quite meaningful for both theoretical research and practical application of Langmuir‐Blodgett films, especially.
The incorporation of C60 in cavities of 5,10,15,20‐tetra‐4‐oxy(2‐stearic acid)phenyl porphyrin in LB film
Authors: Liu Hong‐Guo , Feng Xu‐Sheng , Yang Kong‐Zhang , Cheng Chuan‐Fu Li, Jian , Liang Wei‐An 
Published: September 2010

AbstractThe structure and properties of mixed monolayer or LB film of 5,10,15,20‐tetra‐4‐oxy(2‐stearic acid)phenyl porphyrin/C60 were studied. π‐A isotherms and small angle X‐ray diffraction (SAXD) results show that C60 molecules were incorporated into the cavities of porphyrin molecules in mixed monolayer and LB film. UV‐vis spectra of mixed LB films show that the absorption intensity of porphyrin varied compared with pure porphyrin film, probably arising from the interactions between C60 and porphyrin ring. C60 molecules in mixed systems are well‐dispersed. The TPP(CO2H)/C60 mixed LB film is a kind of two‐dimensional host‐guest system.
Synthesis and magnetism of rare earth (Nd, Gd, Dy, Ho, Er, Y) pentafluoropropionate binuclear complexes with 2‐(4'‐methoxy‐phenyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide
Authors: Jiang Zong‐Hui , Zhang Wei , Liao Dai‐Zheng , Huan Zhen‐Wei , Sun Bai‐Wang , Wang Geng‐Lin 
Published: September 2010

AbstractSix compounds of the general formula [Ln(pfpr)3]2(NITPhOMe)·nH2O, where LnNd, Gd, Dy, Ho, Er, Y, pfpr=pentafluoropropionate, NITPhOMe=2‐(4'‐methoxyphenyl)‐4,4,5, 5‐tetra‐methylimidazoline‐1‐oxyl‐3‐oxide, and n=4 (for Nd, Dy, Er); 3 (for Gd); 6 (for Ho); 5 (for Y), have been synthesized. These complexes were characterized by elemental analyses, IR, electronic spectra and molar conductances. The variable temperature (4–300 K) magnetic susceptibility of the complex [Gd(pfpr)3]2(NITPhOMe)·3H2O was determined. The observed susceptibility data were fit to those from theoretical magnetic equation by least‐squares method. The exchange integral, J, was found to be equal to 2.14 cm−1. This indicates a weak ferromagnetic spin‐exchange interaction between the radical and the gadolinium(III) ion.
1H and 13C NMR studies of TTHA complexes with diamagnetic rare earth ions
Authors: Zhang Shan‐Rong , Ren Ji‐Min , Pei Feng‐Kui , Liu Ai‐Zhuo , Xiao Yan‐Wen 
Published: September 2010

AbstractTTHA complexes with diamagnetic rare earth ions (La3+, Y3+ and Lu3+) were studied by 1H and 13C NMR spectroscopy. A symmetric structural model was suggested for La(TTHA) complex and an asymmetric model for Y(TTHA) and Lu(TTHA) complexes. The complex formation was dependent on the pH value of the solution. The interactions of La(TTHA) with the additional metal ions (La3+, Y3+ and Ca2+) were relatively weak, but relatively strong for that of Lu(TTHA) with the additional Lu3+.
Substituent effects on chloro meso‐tetra‐ortho‐alkylphenylporphinato iron catalyzed biomimetic oxidation of cyclohexane
Authors: Zhu Shen‐Jie , Gui Ming‐De , Jiang Du‐Xiao 
Published: September 2010

AbstractSix sterically hindered chloro meso‐tetra‐ortho‐alkylphenylporphinato irons (T(o‐R)PPFe(III)Cl, R = Me, Et, n‐Pr, i‐Pr, n‐Bu, t‐Bu) were synthesized and used to catalyze the monooxygenation of cyclohexane with PhIO. Both the yields of cyclohexanol and the relative rates of monooxygenation of cyclohexane catalyzed by T(o‐R)PPFe(III)Cl were higher than those of TPPFe(III)Cl respectively. The order of the yields(%) of cyclohexanol and the rate of cyclohexanol formation in the monooxygenation of cyclohexane catalyzed by T(o‐R)PPFe(III)Cl for the different substituents are: i‐Pr(58) > Et(57) > nPr(52) > Me(51) > n‐Bu(48) > t‐Bu(46) > H(35) and i‐Pr > Et > t‐Bu > n‐Pr ⩽ Me ⩽ n‐Bu ⩽ H respectively. The special steric effect on the catalytic character of these different alkyl substituents in T(o‐R )PPFe(III)Cl is proposed on the basis of the results.
Synthesis of 6‐aryl substituted 3‐(5′‐phenyl‐2H‐tetrazole‐2′‐methylene)‐S‐triazolo[3,4‐b]‐1,3,4‐thiadiazoles
Authors: Zhang Zi‐Yi , Zou Ning 
Published: September 2010

AbstractIn this paper. 10 novel 6‐aryl‐3‐(5′‐phenyl‐2H‐tetrazole‐2′‐methylene)‐S‐triazolo[3,4‐b]‐l,3,4‐thiadiazoles have been synthesized by the condensation of 3‐(5′‐phenyl‐2H‐tetrazole‐2′‐methylene)‐4‐amino‐5‐mercapto‐1,2,4‐triazole with various aromatic carboxylic acids in the presence of phosphorus oxychloride. The structure of these compounds was determined by elemental analysis. UV, IR, 1H NMR and MS. Their spectral properties were also discussed.
Stereoselective synthesis of D‐α‐glucopyranosides, di‐ and tri‐saccharides via 6‐O‐acetyl‐glucopyranosyl bromides
Authors: Fei Chang‐Pei , Ma Yue , Chan Tak‐Hang 
Published: September 2010

AbstractAcetyl bromide cleaved 2,3,4‐tri‐O‐benzyl‐1,6‐anhydro‐4β‐D‐glucopyranose (1a) or 2,3,4‐tri‐O‐benzyl‐1,6‐anhydro‐β‐D‐galactopyranose (1a′) to give the corresponding α‐D‐pyranosyl bromides (2). Reaction of 2 with ROH/diisopropylethylamine gave the corresponding α‐glucopyranosides, di‐ and tri‐saccharides with good yield. It was available to use 13C NMR to monitor the glycosidation reaction.
Two furano‐sesquiterpenes from the South China Sea Sponge Dysidea fragilis
Authors: Su Jing‐Yu , Zhong Yong‐Li , Zeng Long‐Mei , Wu Hou‐Ming , Ma Kan 
Published: September 2010

AbstractA new sesquiterpene, ent‐furodysin (1), has been isolated from the South China Sea Sponge Dysidea fragilis, along with a known sesqui‐terpene, ent‐furodysinin (2). The structure and relative stereochemistry of 1 and 2 were established by spectral analysis.
Dye‐sensitized photo‐oxidation of disulfiram
Authors: Chobisa C. S. , Bhardwaj Rajesh , Punjabi Pinki B. , Ameta Suresh C. 
Published: September 2010

AbstractDye‐sensitized photo‐oxidation of disulfiram has been carried out under various reaction conditions including change in solvents and sensitizers. The product has been isolated and characterised by its physical, chemical and spectra data. To confirm the participation of singlet‐oxygen in the reaction, the experiment has also been carried out in the presence of various singlet oxygen scavengers.
Microbial‐chemical routes toRandS‐denopamine a useful drug for congestive heart failure
Authors: Gu Jian‐Xin , Li Zu‐Yi , Lin Guo‐Qiang 
Published: September 2010

AbstractBoth enantiomers of denopamine were synthesized using microbial‐chemical approach via bioreduction of 1‐(acetoxyphenyl)ketone 4(RCH2Cl) and 5(RCO2Et) with fungusGeotrichum sp. G38.
Fabrication and electrochemical behaviors of thin film three electrode‐measurement unit with microdisk array as working electrode
Authors: Zhu Jun‐Hua , Liu Xiao‐Hui , Lu Xin‐Gen , Lin Sin‐Ru 
Published: September 2010

AbstractA three electrode‐measurement unit with 33 microdisk electrode‐array (MDA) as working electrode was constructed by lithography. Its electrochemical behavior was observed. The results of the oxidation of ferrocene in CH3CN‐H2O mixed media demonstrate that high quality electrochemical data for the system without supporting electrolyte can be achieved with the MDA unit constructed in the present work.
A procedure of determining potential energy surfaces of triatomic molecules from inversion of spectroscopic data
Authors: Xie Dai‐Qian , Yan Guo‐Sen , Tian An‐Min 
Published: September 2010

AbstractIn this paper, we have suggested an iterative procedure of optimization of the linear parameters in an analytic potential energy function for a triatomic molecule, by combining both variational and second order perturbation methods. The most important feature of this procedure is that the objective function is an analytical expression which can be optimized easily. The application to the water molecule is presented.
Synthesis and mesomorphic properties of n‐butyl‐4‐[4‐((4‐n‐alkoxyl‐tetrafluorophenyl)ethynyl)benzyloxy]benzoates
Authors: Wen Jian‐Xun , Yin Hui‐Yong , Chen Qi 
Published: September 2010

AbstractA homologous series of n‐butyl‐4‐[4‐((4‐n‐alkoxyl‐tetrafluorophenyl)ethynyl)benzyloxy] benzoates have been synthesized. Their phase transition temperatures have also measured by polarizing textural observation and confirmed by DSC.
Solid state reaction of aromatic ketones with heteroaromatics
Authors: Du Da‐Ming , Meng Shuang‐Ming , Wang Yong‐Mei , Meng Ji‐Ben , Zhou Xiu‐Zhong 
Published: September 2010

AbstractThe solid state reactions of p‐nitroacetophenone, acetyl‐ferrocene with indole were catalyzed by anhydrous zinc chloride or aluminum chloride, and gave exclusively the 1:2 condensation products. The solid state condensation of aromatic ketones with l‐phenyl‐3‐methyl‐5‐pyrazolone was also investigated, and the 1.1 and 2.1 condensation products were obtained. The structures of eleven new products were determined by IR, MS, 1H NMR and elemental analysis.
Band structure calculations for some binary mixed alkali‐metal doped C60
Authors: Yang Cao , Liang‐Jin Chen , Jian‐Wen Feng , You‐Xi Teng , Wen‐Jian Chen 
Published: September 2010

AbstractIn this paper we present the three dimensional EHMO crystal orbital calculations for crystalline Li2CsC60, Na2CsC60, K2CsC60 and Rb2CsC60. For all these four dopants with a fcc structure, our calculated band structures and density of state unequivocally suggest a metallic conducting phase with each a set of three half‐filled band across the Fermi level which is just located close to a peak of density of state. A monotonic relationship is found between our calculated Fermi‐level density of state N and experimental transition temperature Tc which is in excellent agreement with some theoretical studies and experimental results. With our other calculation results, such as the overlap populations between A (where A represents an alkali‐metal) and C60 molecules, net atomic and orbital charges, crystal orbital vectors and various projected DOS, we could probably shed some light on the mechanism of the superconductivity for this new marvelous kind of materials from a chemical point of view.
Theoretical thermochemistry: Entropies and heat capacities for organosilicon compounds part 3
Authors: Guan‐Zhi Ju , Guang‐Lu Ge 
Published: September 2010

AbstractAb initio molecular orbital theory was used to compute entropies, heat capacities and other thermochemical properties for a new organosilicon compound H2SiNaF in the temperature range 300–1500 K. There is currently no information of this kind available about this compound. On the basis of the calculated heat capacities, we have fitted the temperature‐dependent functions for heat capacities to the forms (a+bT+cT2) and (a'+b'T+c'T−2) in the range 300–1500 K. Furthermore, we calculated the equilibrium constants of conversions among the four configurations of this compound. Thus, a new way of determining thermodynamic data theoretically can be derived and is expected to be established.
Spectral study of mono‐meso‐(hydroxyphenyl)octamethylporphyrins
Authors: Ming Li , Xiao‐Yu Chen , Jiang‐Zong Zou , Zheng Xu , Xiao‐Zeng You 
Published: September 2010

AbstractThe behaviour of porphyrins [mono‐meso‐(2‐hydroxyphenyl)octamethylporphyrin, mono‐meso‐(4‐hydroxyphenyl)octamethylporphyrin and mono‐meso‐(3,4‐dihydroxyphenyl)octamethylporphyrin] in basic solution is examined by UV‐Visible and 1H NMR spectroscopy. The unusual nature of the spectra may be explained by the formation of porphomethene moieties in which the porphyrin chromophore is modified by interruption of the π‐system. The porphyrins in bases are less susceptible to oxidation in contrast with meso‐tetrakis‐(4′‐hydrooxyphenyl)porphyrins.
Syntheses and crystal structures of [(C6H5CH2C5H4)2GdCl.THF]2 and (C6H5CH2C5H4)2ErCl.THF
Authors: Ju‐Song Xia , Zhong‐Sheng Jin , Wen‐Qi Chen 
Published: September 2010

Abstract[(C6H5CH2C5H4)2GdCl.THF]2 (1) and (C6H5CH2C5H4)2ErCl.THF (2) were prepared by the reaction of LnCl3 (LnGd, Er) with benzylcyclopentadienyl sodium in THF and characterized by elemental analysis, IR, 1H NMR, 13C NMR, MS and thermal gravimetry. The crystal structures of both compounds were determined. Complex 1 is dimeric and its structure belongs to the monoclinic, P21/c space group with a=1.1432(2), b=1.2978(2), c=1.7604(3) nm, β=108.75(2), V=2.4732(9) nm3, Z=2(four monomers), Dc“1.54 g.cm−3. R=0.0342 and Rw“0.0362. Complex 2 is monomer and its structure belongs to the orthorhombic, P212121 space group with a=0.8645(2), b=1.1394(3), c=2.5289(4) nm, V=2.4919(9) nm3, Z=4, Dc“1.56 g.cm−3. R=0.0514, Rw“0.0529. The determination of the crystal structure shows that in complex 1 the benzyl groups on the cyclopentadienyls coordinated to Gd3+ are located in the opposite direction (139°); in complex 2 the benzyl groups on the cyclopentadienyls coordinated to Er3+ are located in the same direction (6.5°).
Integration of computer‐assisted statistical scanning optimization system in HPLC
Authors: Qin‐Sun Wang , Ru‐Yu Gao , Bing‐Wen Yan 
Published: September 2010

AbstractThree computer‐assisted statistical scanning methods, the monofactor optimization system (MOS), multicomponent solvent optimization system (MSOS), and difactor optimization system (DOS) for optimizing HPLC separations, have been integrated to produce the optimization system of HPLC (OS‐L). The method proposes the complementary use of these techniques, maximizing their strengths while compensating for their weaknesses. The result of OS‐L is a method development strategy which obtains simple solutions for simple separation problems and reserves the more complex solutions for difficult separations.
Synthesis and mesomorphic properties of 1‐(4′‐ethyl biphenylyl) 2‐(4‐alkoxy‐2,3,5,6‐tetrafluorophenyl) acetylenes
Authors: Yue‐Lian Xu , Hui‐Yong Yin , Wei‐Li Wang , Qi Chen , Jian‐Xun Wen 
Published: September 2010

AbstractA series of l‐(4′‐ethylbiphenylyl) 2‐(4‐alkoxy‐2,3,5,6‐tetrafluorophenyl)acetylenes and their nonfluorinated analogues have been prepared. The polarizing microscope observation shows that the fluorinated target compounds exhibit enantiotropic nematic phases, whereas the nonfluorinated analogues show complicated DSC results. The effect of structure modification of the core on mesogenic phases was discussed by comparing the data of fluorinated target compounds with those of corresponding nonfluorinated analogues.
Quantum chemical study on the thermal rearrangements of HNCRCR'CO
Authors: Yong‐Hong Li , San‐Guo Hong 
Published: September 2010

AbstractMINDO/3 molecular orbital theory has been used to study the thermal rearrangements of HNCRCR'CO. The results obtained show that the activation energy of this rearrangement depends on the migrating group R and the group R'.