Kinetics and volumes of activation of the reactions of nickel(II) and cobalt(II) ions with some uncharged ligands in water, studied by a laser temperature-jump method at high pressures

1971 ◽  
pp. 1351 ◽  
Author(s):  
E. F. Caldin ◽  
M. W. Grant ◽  
B. B. Hasinoff
Keyword(s):  
High Pressures ◽  
Temperature Jump ◽  
Laser Temperature Jump

Time-Resolved Dissociation of the Light-Harvesting 1 Complex ofRhodospirillumrubrum, Studied by Infrared Laser Temperature Jump†

Biochemistry ◽  
2002 ◽  
Vol 41 (51) ◽  
pp. 15115-15120 ◽  
Author(s):  
Anjali Pandit ◽  
Hairong Ma ◽  
Ivo H. M. van Stokkum ◽  
Martin Gruebele ◽  
Rienk van Grondelle
Keyword(s):  
Temperature Jump ◽  
Light Harvesting ◽  
Infrared Laser ◽  
Time Resolved ◽  
Laser Temperature Jump

Interfacial Dynamics of Water-in-Oil Dropliets: a Temperature-Jump Investigation

1992 ◽  
Vol 290 ◽  
Author(s):  
Paschalis Alexandridis ◽  
Josef F. Holzwarth ◽  
T. Alan Hatton
Keyword(s):  
Initial Temperature ◽  
Temperature Jump ◽  
Salt Content ◽  
Time Interval ◽  
Bending Rigidity ◽  
Bending Modulus ◽  
System Equilibrium ◽  
Shape Perturbation ◽  
Laser Temperature Jump ◽  
Spherical Interface

AbstractThe dynamic response of water-in-oil AOT microemulsion droplets to perturbations caused by rapid energy transfer has been interpreted in terms of the surfactant interface bending rigidity. The Iodine Laser Temperature Jump technique was used to rapidly (1 μs) increase the microemulsion temperature and thus disturb the system equilibrium. The dynamic relaxation to the new equilibrium position was monitored by measuring the turbidity of the microemulsion over a I ms time interval immediately after the temperature jump. The rate and direction of the turbidity change depended on the initial temperature, size and salt content of the water droplets. We observed characteristic times of 2 to 10 μs and attributed them to the relaxation of the surfactant interface. A bending modulus of 0.4 kT was derived for the AOT interface, using a model for the shape perturbation of a spherical interface.

Laser Temperature Jump Study of the Helix⇌Coil Kinetics of an Alanine Peptide Interpreted with a ‘Kinetic Zipper' Model

Biochemistry ◽  
1997 ◽  
Vol 36 (30) ◽  
pp. 9200-9210 ◽  
Author(s):  
Peggy A. Thompson ◽  
William A. Eaton ◽  
James Hofrichter
Keyword(s):  
Temperature Jump ◽  
Laser Temperature Jump ◽  
Kinetics Of

Dynamics of the Bis-Tris and High Spin-Low Spin Equilibria of 2-(2′-Pyridyl)imidazoleiron(II) Complexes in Dimethyl Sulfoxide Solutions

1988 ◽  
Vol 41 (9) ◽  
pp. 1315 ◽  
Author(s):  
JK Beattie ◽  
KJ Mcmahon
Keyword(s):  
Relaxation Time ◽  
Dimethyl Sulfoxide ◽  
Equilibrium Constant ◽  
Rate Constants ◽  
Temperature Jump ◽  
Free Ligand ◽  
Relaxation Curve ◽  
Dissociation Equilibrium ◽  
Laser Temperature Jump ◽  
Equilibrium Transition

Ultrasonic and temperature-jump relaxation kinetics have been used to observe, respectively, the spin equilibrium and tris-bis ligand dissociation equilibrium of the 2-(2′-pyridyl) imidazoleiron (II) complexes in dimethyl sulfoxide solutions. In the ultrasonic experiments a single relaxation curve describes the excess sound absorption with a relaxation time of 73�3 ns. This was identified as perturbation of the singlet-quintet spin equilibrium by comparison with previous laser temperature-jump measurements in other solvents and by the temperature dependence of the relaxation amplitude. The equilibrium constant for the singlet-quintet transition was determined by the Evans n.m.r . method to be 0.48 at 298 K. From the relaxation time and the equilibrium constant the rate constants for the spin-equilibrium transition can be calculated to be k15 of 4.5×106 s-1 and k51 of 9.4×106s-1. In the temperature-jump experiments a millisecond relaxation time was observed. The dependence of the relaxation time on the concentration of the free ligand is of the form kobs = a + b[L]. From the ratio b/a an equilibrium constant for the perturbed process can be calculated. An independent measure of this equilibrium constant was obtained from spectrophotometric measurements. The rate constants for the formation and dissociation of the tris complex are calculated to be 2.8 × 104 dm3 mol-1 s-1 and 2.1 × 102 s-1, respectively, at 298 K.

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