Inorganic

Download Aminophosphonic and Aminophosphinic Acids: Chemistry and by Valery P. Kukhar, Harry R. Hudson PDF

By Valery P. Kukhar, Harry R. Hudson

Aminophosphinic and aminoposphonic acids, artificial analogs to ordinary amino acids, have attained a place of prominence in research--particularly in learn regarding the amendment of physiological methods in dwelling organisms.

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Additional info for Aminophosphonic and Aminophosphinic Acids: Chemistry and Biological Activity

Example text

But may cross the transition region many times, tottering back and forth before reaction. , a small value of Kel [see equation (1)] can be offset by the fact that the reacting system is forced to spend more time in the vicinity of the crossover point. Hynes discusses solvent motion in terms of "frequencydependent" friction and considers the effect of fast and slow relaxation processes, again under conditions ranging from adiabatic to nonadiabatic. (104) Warshel considered the effects of solvent dipole fluctuation on the rate of crossing between the two resonance forms of the electron transfer system, (119) using a semiclassical trajectory model.

1. 4 AR'" (kcal mol-I) 23 23 23 21 21 21 21 21 61 61 61 61 61 61 61 9 10 10 12 6 33 16 16 16 16 62 62 Ref. ,\:> g. ~ ~ ~ ~ l:>... ;, 0'1 ..... 1]cryptand)]3+ . 1. 2 tlH" (kcal mol-I) 40 tlS" (cal K- I mol-I) 52 49 49 49 49 49 49 49 49 34 35 35 25 62 63 63 63 24 24 24 24 Ref. ,~ ~ ~ ~ • ~ .... 5 -19 (continued) 49 50 16 52 52 52 53 53 53 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 ..... § ~ 0:: §. ~ ~ '" :: is' ~ ~ ~ ~ • ..... 1. S" (cal K- I mol-I) 22 22 61 61 61 36 36 36 36 36 54 54 54 54 54 54 54 54 54 54 54 23 39 36 Ref.

2. 1. (1) Outer-sphere reductions occur when x n - = NH 2 S0 3 or SO~-, with Ti3+ and 27 2 28 • Redox Reactions between Two Metal Complexes [TiOH]2+ pathways in the former reaction, and [TiOH]2+ as the sole redundant with the latter complex. The inner-sphere reduction of[(NH3)sRu(S203)]+ proceeds via the conjugate base of the binuclear intermediate. The reactivities of the Ru(I1I)/Ti(III) systems indicate that the S03 group is inefficient in mediating electron transfers involving t 2g donor and acceptor orbitals.

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