The effect of molecular structure on the secondary transitions and their influence on the decoloration kinetics of photochromic dyes in co-polycarbonates

2016 ◽  
Vol 54 (16) ◽  
pp. 1593-1601 ◽  
Author(s):  
Fabrizio Micciche ◽  
Vaidyanath Ramakrishnan ◽  
Theodorus L. Hoeks
Keyword(s):  
Molecular Structure ◽  
Kinetics Of ◽  
Secondary Transitions ◽  
Decoloration Kinetics

Kinetics and mechanisms of the ligand substitution of (η5-C9H7)M(CO)4, where M=Nb or Ta, and a reinvestigation of the kinetics of (η5-C5H5)M(CO)4. Molecular structure of (η5-C5H5)Nb(Co)3[P(C6H5)3]

2000 ◽  
Vol 605 (2) ◽  
pp. 168-173 ◽  
Author(s):  
Thomas E. Bitterwolf ◽  
Dinara Lukmanova ◽  
Skip Gallagher ◽  
Arnold L. Rheingold ◽  
Ilia A. Guzei ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Ligand Substitution ◽  
Kinetics Of

scholarly journals Influence of RANEY Nickel on the Formation of Intermediates in the Degradation of Lignin

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Daniel Forchheim ◽  
Ursel Hornung ◽  
Philipp Kempe ◽  
Andrea Kruse ◽  
David Steinbach
Keyword(s):  
Molecular Structure ◽  
Reaction Mechanism ◽  
Enzymatic Hydrolysis ◽  
Raney Nickel ◽  
High Selectivity ◽  
Main Product ◽  
Hydrolysis Lignin ◽  
Renewable Source ◽  
Mechanism And Kinetics ◽  
Kinetics Of

Lignin forms an important part of lignocellulosic biomass and is an abundantly available residue. It is a potential renewable source of phenol. Liquefaction of enzymatic hydrolysis lignin as well as catalytical hydrodeoxygenation of the main intermediates in the degradation of lignin, that is, catechol and guaiacol, was studied. The cleavage of the ether bonds, which are abundant in the molecular structure of lignin, can be realised in near-critical water (573 to 673 K, 20 to 30 MPa). Hydrothermal treatment in this context provides high selectivity in respect to hydroxybenzenes, especially catechol. RANEY Nickel was found to be an adequate catalyst for hydrodeoxygenation. Although it does not influence the cleavage of ether bonds, RANEY Nickel favours the production of phenol from both lignin and catechol. The main product from hydrodeoxygenation of guaiacol with RANEY Nickel was cyclohexanol. Reaction mechanism and kinetics of the degradation of guaiacol were explored.

Molecular structure effects on the kinetics of hydroxyl radical addition to azo dyes

2002 ◽  
Vol 15 (5) ◽  
pp. 287-292 ◽  
Author(s):  
Hugo Destaillats ◽  
Adrián G. Turjanski ◽  
Darío A. Estrin ◽  
Michael R. Hoffmann
Keyword(s):  
Molecular Structure ◽  
Hydroxyl Radical ◽  
Azo Dyes ◽  
Radical Addition ◽  
Kinetics Of

Crystal and molecular structure and the kinetics of ligand exchange of tris(N,N-dimethyldithiocarbamato)thallium(III)

1975 ◽  
Vol 14 (9) ◽  
pp. 2070-2075 ◽  
Author(s):  
H. Abrahamson ◽  
J. R. Heiman ◽  
L. H. Pignolet
Keyword(s):  
Molecular Structure ◽  
Ligand Exchange ◽  
Crystal And Molecular Structure ◽  
Kinetics Of

scholarly journals Molecular structure and biodegradation kinetics of linear alkylbenzene sulphonates in sea water

2006 ◽  
Vol 18 (5) ◽  
pp. 567-578 ◽  
Author(s):  
Jose A. Perales ◽  
Manuel A. Manzano ◽  
M. Carmen Garrido ◽  
Diego Sales ◽  
Jose M. Quiroga
Keyword(s):  
Molecular Structure ◽  
Sea Water ◽  
Biodegradation Kinetics ◽  
Linear Alkylbenzene ◽  
Kinetics Of

scholarly journals Distance dependent charge separation and recombination in semiconductor/molecular catalyst systems for water splitting

2014 ◽  
Vol 50 (84) ◽  
pp. 12768-12771 ◽  
Author(s):  
Anna Reynal ◽  
Janina Willkomm ◽  
Nicoleta M. Muresan ◽  
Fezile Lakadamyali ◽  
Miquel Planells ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Water Splitting ◽  
Charge Separation ◽  
Molecular Catalyst ◽  
Catalyst Systems ◽  
Kinetics Of

The molecular structure of the catalyst strongly influences the kinetics of charge separation and recombination.

The Role of Intermolecular Forces in the Mechanism of High-Elastic Deformation. I. The Molecular Mechanism and an Equation for the Kinetics of High Elastic Deformation

1951 ◽  
Vol 24 (2) ◽  
pp. 336-343
Author(s):  
B. A. Dogadkin ◽  
G. M. Bartenev ◽  
M. M. Reznikovskii˘
Keyword(s):  
Molecular Structure ◽  
Molecular Mechanism ◽  
Elastic Deformation ◽  
Approximate Equation ◽  
Intermolecular Forces ◽  
Joint Application ◽  
Balanced Configurations ◽  
Kinetics Of ◽  
Constant Deformation

Abstract 1. The molecular mechanism of the relaxation of deformation of high-elastic polymers has been studied. 2. It is shown that the slow relaxation, which is typical of high-elastic polymers, may be best explained as a restoration process, which either partial or complete (depending on the degree of development of side chains in the molecular structure formed by the main valence chains) of the balanced configurations of the molecular chains. 3. It is shown that the rate of the relaxation process in this case is determined by the molecular activity of the particular polymer. 4. An approximate equation for the kinetics of high-elastic deformation which expresses qualitatively the mechanical properties of high-elastic polymers is proposed. 5. Hypotheses concerning the relation between the time of relaxation and the unbalanced stress are advanced. Equation (2) is derived as characteristic of this relation. 6. It is shown that the joint application of Equations (1) and (2) makes it possible to describe qualitatively the relaxation of stress at constant deformation.

Kinetics of rapid reactions involving two pairs of consecutive second order steps

1953 ◽  
Vol 6 (3) ◽  
pp. 195 ◽  
Author(s):  
HG Higgins ◽  
EJ Williams
Keyword(s):  
Molecular Structure ◽  
Second Order ◽  
The Other ◽  
Rate Equations ◽  
Special Cases ◽  
Kinetics Of ◽  
Initial Reactivity

An examination is made of the kinetics of the reaction between A and B, where both reactants are capable of unifunctional behaviour, and A is also capable of bifunctional behaviour, for the general case in which the two reactive sites on A are not equivalent. Solutions are given of the appropriate rate equations for the two pairs of consecutive stages, and it is shown that the final concentrations of reactants and products can be related to given values of the initial concentrations and the velocity constants of the four second order stages. Relatively simple relations are established between the final concentrations and the ratio of the velocity constants for the case in which reaction at one position on A does not affect the reactivity of the other position. Some special cases of interest are considered. The results are related to the authors' earlier treatment of the case In which the initial reactivity of the two positions on A is initially the same. The theory is applied, by way of example, to the coupling of histidine with p-diazobenzenesulphonic acid, which appears to conform to the assumption of the same initial reactivity. The implications of the method in the correlation of molecular structure and reactivity are briefly discussed.

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