Transition state theory

Figure 1: Reaction coordinate diagram for the bimolecular nucleophilic substitution (SN2) reaction between bromomethane and the hydroxide anion

Figure 3: Purine nucleoside phosphorylase reaction with inosine substrate

Figure 4: PNP transition state and immucillin-H transition state analog

Transition state theory (TST) explains the reaction rates of elementary chemical reactions. The theory assumes a special type of chemical equilibrium (quasi-equilibrium) between reactants and activated transition state complexes.

TST is used primarily to understand qualitatively how chemical reactions take place. TST has been less successful in its original goal of calculating absolute reaction rate constants because the calculation of absolute reaction rates requires precise knowledge of potential energy surfaces, but it has been successful in calculating the standard enthalpy of activation (ΔH), the standard entropy of activation (ΔS), and the standard Gibbs energy of activation (ΔG) for a particular reaction if its rate constant has been experimentally determined. (The notation refers to the value of interest at the transition state.)

单词	Absolute reaction rate theory
释义	Absolute reaction rate theory 英语百科 Transition state theory Transition state theory (TST) explains the reaction rates of elementary chemical reactions. The theory assumes a special type of chemical equilibrium (quasi-equilibrium) between reactants and activated transition state complexes. TST is used primarily to understand qualitatively how chemical reactions take place. TST has been less successful in its original goal of calculating absolute reaction rate constants because the calculation of absolute reaction rates requires precise knowledge of potential energy surfaces, but it has been successful in calculating the standard enthalpy of activation (ΔH), the standard entropy of activation (ΔS), and the standard Gibbs energy of activation (ΔG) for a particular reaction if its rate constant has been experimentally determined. (The notation refers to the value of interest at the transition state.)
随便看	polystichopsis festina shieh的意思 polystichopsis hasseltii ching的意思 polystichopsis nigrospinosa shieh的意思 polystichopsis quardripinnata shieh的意思 polystichopsis subrflexipinna shieh的意思 polystichous的意思 polystichum的意思 polystichum acanthophyllum的意思 Polystichum acanthophyllum Bedd.的意思 Polystichum acrostichoides的意思 Polystichum aculeatum的意思 polystichum aculeatums的意思 polystichum aculeatum schott.var.japonicum christ的意思 polystichum acuminatum的意思 polystichum acutidens的意思 polystichum acutidens christ的意思 Polystichum adiantiformis的意思 polystichum atkinsonii的意思 Polystichum atuntzeense的意思 polystichum aucleatum schott.的意思 polystichum biaristatum的意思 polystichum biaristatum moore的意思 Polystichum braunii的意思 Polystichum braunii Fee的意思 polystichum brauniis的意思

Absolute reaction rate theory

Transition state theory