The mechanisms and steric course of substitution at a divalent ruthenium centre

1966 ◽  
Vol 19 (12) ◽  
pp. 2235 ◽  
Author(s):  
B Bosnich ◽  
FP Dwyer
Keyword(s):  
Absolute Configuration ◽  
Complex Cation ◽  
Optically Active ◽  
The Other ◽  
Active Complex ◽  
Pyridine Group ◽  
Kinetics Of

The thermal rates of substitution of one pyridine group coordinated to the optically active complex cation cis-[Ru phen2 py2]2+ (phen = o- phenanthroline, py = pyridine) dissolved in dry acetone have been measured using the anions Cl-, Br-, I-, NCS-, N-3, and NO-2. It was found that for all anions monosubstitution proceeded with complete retention of absolute configuration. The anions Cl-, Br-, I-, and NCS- substituted at a rate which was independent of their nature and concentration. The kinetics of substitution of the anions N-3 and NO-2 have not been fully resolved, but the rates of reaction of these two anions appear to be faster than the other four.

The Reactivity of Different Active Forms of Sodium Carbonate with Respect to Sulfur Dioxide

1992 ◽  
Vol 57 (11) ◽  
pp. 2302-2308
Author(s):  
Karel Mocek ◽  
Erich Lippert ◽  
Emerich Erdös
Keyword(s):  
Thermal Decomposition ◽  
Liquid Phase ◽  
Sulfur Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Sodium Carbonate ◽  
Room Temperature ◽  
Active Form ◽  
The Other ◽  
Kinetics Of

The kinetics of the reaction of solid sodium carbonate with sulfur dioxide depends on the microstructure of the solid, which in turn is affected by the way and conditions of its preparation. The active form, analogous to that obtained by thermal decomposition of NaHCO3, emerges from the dehydration of Na2CO3 . 10 H2O in a vacuum or its weathering in air at room temperature. The two active forms are porous and have approximately the same specific surface area. Partial hydration of the active Na2CO3 in air at room temperature followed by thermal dehydration does not bring about a significant decrease in reactivity. On the other hand, if the preparation of anhydrous Na2CO3 involves, partly or completely, the liquid phase, the reactivity of the product is substantially lower.

On the kinetics of Hadamard-type fractional differential systems

2020 ◽  
Vol 23 (2) ◽  
pp. 553-570 ◽  
Author(s):  
Li Ma
Keyword(s):  
Differential Operator ◽  
Numerical Simulations ◽  
Type Inequality ◽  
The Other ◽  
Differential Systems ◽  
Fractional Differential Systems ◽  
Fractional Differential Operator ◽  
Fractional Differential ◽  
Kinetics Of ◽  
Theoretical Results

AbstractThis paper is devoted to the investigation of the kinetics of Hadamard-type fractional differential systems (HTFDSs) in two aspects. On one hand, the nonexistence of non-trivial periodic solutions for general HTFDSs, which are considered in some functional spaces, is proved and the corresponding eigenfunction of Hadamard-type fractional differential operator is also discussed. On the other hand, by the generalized Gronwall-type inequality, we estimate the bound of the Lyapunov exponents for HTFDSs. In addition, numerical simulations are addressed to verify the obtained theoretical results.

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