Self-assembly of tetranuclear {[Co(trien)]2[W(CN)8]2}2– or {[Co(tren)]2[W(CN)8]2}2– squares with alternating aliphatic tetramine Co(iii) and octacyanotungstate(iv) cornersElectronic supplementary information (ESI) available: the distances (Å) and angles (°) of possible hydrogen bonds for K2{[CoIII(tren)]2[WIV(CN)8]2}·9H2O (2); rate constants and activation parameters for the reaction of cis-α-[Cr(trien)Cl(OH2)]2+ with [W(CN)8]4– in aqueous solution. See http://www.rsc.org/suppdata/dt/b2/b210669h/

2003 ◽  
pp. 1033-1040 ◽  
Author(s):  
Rafał Kania ◽  
Krzysztof Lewiński ◽  
Barbara Sieklucka
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Rate Constants ◽  
Self Assembly ◽  
Activation Parameters ◽  
Supplementary Information

Octahedral cobalt(III) complexes of the chloropentanimine type. XXX. The thallium(III)-induced aquation of some cis-Halogeno(amine)bis(ethylenediamine)cobalt(III) cations in aqueous solution

1973 ◽  
Vol 26 (6) ◽  
pp. 1235 ◽  
Author(s):  
SC Chan ◽  
SF Chan
Keyword(s):  
Aqueous Solution ◽  
Rate Constants ◽  
Activation Parameters ◽  
Second Order ◽  
Alternative Possibility ◽  
Order Rate ◽  
Leaving Group ◽  
Activated Complex

The second-order rate constants for the thallium(III)-induced aquation of cis-[Co(en)2(RNH2)Cl]2+ cations, where R is H, Me, Et, Prn, and Pri, have been measured in aqueous solution over a range of temperatures, and the activation parameters calculated. The kinetic results are discussed in terms of a rapid pre-equilibrium formation of an activated complex Co-Cl-Tl, followed by a simple rate-determining aquation in which TlCl2+ acts as the leaving group, although the alternative possibility of a rate-determining attack by Tl3+ cannot be excluded. In the case of R = H, the investigations have been extended to the corresponding bromo cation which reacts some 50 times faster than its chloro analogue.

Rate constants for the dissociation of amine-water hydrogen bonds and the effect of nonpolar groups in aqueous solution

1967 ◽  
Vol 89 (17) ◽  
pp. 4405-4411 ◽  
Author(s):  
Ernest. Grunwald ◽  
Earle K. Ralph
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Rate Constants ◽  
Water Hydrogen

Kinetic studies of ring closures in platinum(II) chelates. Rate constants and activation parameters for chelation of platinum(II) by bis(2-aminoethyl) sulfide in aqueous solution

1979 ◽  
Vol 18 (6) ◽  
pp. 1451-1454 ◽  
Author(s):  
G. Albertin ◽  
E. Bordignon ◽  
A. A. Orio ◽  
B. Pavoni ◽  
Harry B. Gray
Keyword(s):  
Aqueous Solution ◽  
Rate Constants ◽  
Activation Parameters ◽  
Kinetic Studies

scholarly journals Studies on Cyclic Anhydrides. I. Rate Constants and Activation Parameters for the Solvolysis of Alkylsubstituted Cyclic Anhydrides in Aqueous Solution by the pH-stat Method.

1964 ◽  
Vol 18 ◽  
pp. 534-542 ◽  
Author(s):  
Lennart Eberson ◽  
Martin Nilsson ◽  
J. A. Elvidge ◽  
J. S. Burton ◽  
Roger Stevens
Keyword(s):  
Aqueous Solution ◽  
Rate Constants ◽  
Activation Parameters ◽  
Ph Stat ◽  
Cyclic Anhydrides ◽  
Stat Method

Preparation of BSA Nanoparticles by Desolvation Technique Using Acetone as Desolvating Agent

2012 ◽  
Vol 5 (1) ◽  
pp. 1643-1647
Author(s):  
Krishna Sailaja A ◽  
Amareshwar P
Keyword(s):  
Aqueous Solution ◽  
Standard Deviation ◽  
Process Parameters ◽  
Self Assembly ◽  
Size Control ◽  
Polymeric Materials ◽  
Preparation Condition ◽  
Assembly Process ◽  
Average Size

In order to see the functionality and toxicity of nanoparticles in various food and drug applications, it is important to establish procedures to prepare nanoparticles of a controlled size. Desolvation is a thermodynamically driven self-assembly process for polymeric materials. In this study, we prepared BSA nanoparticles using the desolvation technique using acetone as desolvating agent. Acetone was added intermittently into 1% BSA solution at different pH under stirring at 700 rpm. Amount of acetone added, intermittent timeline of acetone addition, and pH of solution were considered as process parameters to be optimized. The effect of the process parameters on size of the nanoparticles was studied. The results indicated that the size control of BSA nanoparticles was achieved by adding acetone intermittently. The standard deviation of average size of BSA nanoparticles at each preparation condition was minimized by adding acetone intermittently. The intermittent addition in polymeric aqueous solution can be useful for size control for food or drug applications.  

Capillary flows and self-assembly of porous hydrate structures

2012 ◽  
Vol 9 (1) ◽  
pp. 22-25
Author(s):  
S.V. Amel’kin ◽  
D.Ye. Igoshin
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Self Assembly ◽  
Capillary Flow ◽  
Secondary Crystallization ◽  
Assembly Model ◽  
Physical Processes ◽  
Good Correspondence ◽  
Solution Formation ◽  
Capillary Flows

A self-assembly model for porous hydrate structures is proposed, which takes into account the sequence of basic physical processes: hydrate growth on the surface of the aqueous solution, formation of islet structure, capillary flow, separation and transfer of secondary crystallization nuclei to the meniscus. The model was studied within the cellular automata method. A good correspondence between the results of the simulation and the experimental data is obtained.

Instability of Solutions of Quaternary Ammonium Permanganates in Dichloromethane

1997 ◽  
Vol 62 (6) ◽  
pp. 849-854 ◽  
Author(s):  
Vladislav Holba ◽  
Renata Košická
Keyword(s):  
Ammonium Salt ◽  
Rate Constants ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Activation Parameters ◽  
The Stability

The paper deals with instability of solutions of quaternary ammonium permanganates, QMnO4 (Q = tetraethyl-, tetra-1-propyl-, tetra-1-butyl-, tetra-1-pentyl-, tetra-1-octyl-, and cetyltrimethylammonium), in dichloromethane and presents the rate constants and activation parameters of the reduction of permanganate. Attention was paid to the properties of colloidal Mn(IV) intermediate. The stability of the solutions depends markedly on the quaternary ammonium salt used.

Sign in / Sign up

Export Citation Format

Share Document