排序方式: 共有42条查询结果,搜索用时 31 毫秒
1.
Vasudevan Lakshminarayanan Cindhuja Chockalingam Dr. Eduardo Mendes Dr. Prof. Jan H. van Esch 《Chemphyschem》2021,22(21):2256-2261
Properties such as shear modulus, gelation time, structure of supramolecular hydrogels are strongly dependent on self-assembly, gelation triggering mechanism and processes used to form the gel. In our work we extend reported rheology analysis methodologies to pH-triggered supramolecular gels to understand structural insight using a model system based on N−N’ Dibenzoyl-L-Cystine pH-triggered hydrogelator and Glucono-δ-Lactone as the trigger. We observed that Avrami growth model when applied to time-sweep rheological data of gels formed at lower trigger concentrations provide estimates of fractal dimension which agree well compared with visualization of the microstructure as seen via Confocal Laser Scanning Microscopy, for a range of gelator concentrations. 相似文献
2.
The oxidation of aniline in glacial acetic acid with percarbonate, a dry carrier of hydrogen peroxide, is a second-order reaction conforming to the isokinetic relationship. The hitherto followed method of correlation of the reaction rates in terms of the structure-reactivity relationships is unsatisfactory and erroneous. But the reaction rates of molecular anilines, obtained for the first time, conform to the structure-reactivity relationships. 相似文献
3.
Alicia L. Gui Guozhen Liu Muthukumar Chockalingam Guillaume Le Saux Erwann Luais Jason B. Harper J. Justin Gooding 《Electroanalysis》2010,22(16):1824-1830
4‐Nitrophenyl layers were grafted on gold and glassy carbon surfaces by electrochemical reductive adsorption of the corresponding diazonium salt. Electrochemical conversion efficiencies of 4‐nitrophenyl moieties to 4‐aminophenyl moieties on gold versus on glassy carbon in a protic medium were investigated using X‐ray photoelectron spectroscopy (XPS). In total contrast to all previous comparative studies showing greater electrochemical reactivity of aryl diazonium salt‐derived layers on gold than on glassy carbon, a much lower rate of conversion to 4‐aminophenyl was observed on gold than on glassy carbon by both cyclic voltammetry (CV) and chronoamperometry (CA) methods. The lower electron transfer rate during conversion observed on gold versus glassy carbon was proposed to be due to a mechanism related to the molecular structure rearrangement of 4‐nitrophenyl during the process on glassy carbon. However, whilst complete conversion of 4‐nitrophenyl to 4‐aminophenyl on gold by chronoamperometry was achieved, on glassy carbon complete reduction could not be achieved under the same conditions. 相似文献
4.
Chockalingam Karunakaran Kaliyaperumal Anandhy Velusamy Ramachandran 《Monatshefte für Chemie / Chemical Monthly》2000,34(2):1025-1029
Upon aging, perborate in glacial acetic acid generates peracetic acid and thus oxidizes S-phenylmercaptoacetic acid rapidly. Perborate dissolved in ethylene glycol, however, does not show the aging effect, and the corresponding oxidation proceeds smoothly. The oxidation is of second order and not acid catalyzed. Boric acid and borate do not influence the oxidation. In the smooth oxidation, is the reactive species. The oxidation of some para-substituted S-phenylmercaptoacetic acids conforms to the Exner relationship, indicating operation of a common mechanism. Also, the oxidation obeys the Hammett equation with a negative reaction constant. However, the oxidation of p-nitro-S-phenylmercaptoacetic acid follows a different kinetic pathway. 相似文献
5.
Summary Perborate in aqueous solution generates H2O2; in its presence the molybdenum(VI) catalysed oxidation of iodide ion is first order with respect to the oxidant and catalyst, and is independent of [I–] and [H+]. Kinetic studies point to peroxymolybdenum(VI) species as the oxidizing species. 相似文献
6.
Chockalingam Venkatachalapathy Muniappan Thirumalaikumar Shanmugam Muthusubramanian Kasi Pitchumani Shunmugaperumal Sivasubramanian 《合成通讯》2013,43(23):4041-4047
Abstract: The first clean and the facile clay catalysed synthesis of á,N-diarylnitrones in good yield is reported. 相似文献
7.
Vanadia photocatalyzes the oxidation of aniline to azobenzene in ethanol. The reaction was studied using natural sunlight and UV irradiation (365 nm) as a function of [aniline], catalyst loading, airflow rate, solvent composition, etc. The photocatalyst exhibits sustainable catalytic activity. The product formation is greater with illumination at 254 nm than at 365 nm. Electron donors such as triphenylphosphine, diphenylamine, and hydroquinone enhance the photocatalysis. The singlet oxygen quencher azide ion fails to inhibit the catalysis. The photocatalysis takes place in both protic and aprotic solvents. The mechanism of photocatalysis is discussed and the product formation analyzed using a kinetic model. 相似文献
8.
The force constants of XeO3F2 have been evaluated using the general valence force field. The mean square amplitudes of vibration, the generalised mean
square amplitudes and shrinkage constants, Coriolis coupling coefficients and centrifugal distortion constants have also been
calculated for the first time using the vibrational frequencies and the structural parameters. The thermodynamic properties
have been computed for the ideal gaseous state at 1 atmospheric pressure for 11 temperatures from 100° to 1000°K using a rigid
rotor harmonic oscillator approximation. 相似文献
9.
Chockalingam Karunakaran Vaithiyalingam Chidambaranathan 《Monatshefte für Chemie / Chemical Monthly》2000,77(1):1123-1128
The oxidation of methylphenyl sulfide by imidazolium dichromate in acetonitrile mediated by p-toluenesulfonic acid is first order in IDC and TsOH and zero order in MeSPh in the concentration range studied. The IDC oxidation of 14 para-, meta-, and ortho-substituted phenylmethylsulfides at 20–45°C conforms to the isokinetic relationship but not to any of the linear free energy relationships; the isokinetic temperature lies within the experimental temperature range. 相似文献
10.