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(a)
Y
K
10
3
H
M
W
R
N
S
G
E
Q
10
2
T
F
I
V
A
D
L
P
10
1
10
0
-1.2
-0.8
-0.4
0.0
0.4
0.8
1.2
log (K/K
o
)
(b)
10
8
T
N
S
H
K
M
Q
R
W
G
10
7
F
Y
E
A
D
L,V
I
10
6
P
10
5
10
4
-1.0
-0.5
0.0
0.5
1.0
1.5
log K/K
o
Figure 6.34.
k
(Fe(VI)+amino acids)) (a) and
k
(Fe(V)+amino acids)) (b) as a function
of log(
K
/
K
0
).
K
0
is the ionization constant for the unsubstituted amino acid Gly
(
3
, whereas
K
's are the corresponding dissociation constants of
amino acids, in which the α-H atom has been replaced by different R groups
(
H CH NH COO
−
+ −
(
)
)
3
. A, Ala; R, Arg; N, Asn; D, Asp; E, Glu; Q, Gln; G, Gly; H, His; I,
Ile; L, Leu; K, Lys' M, Met; F, Phe; P, Pro; S, Ser; T, Thr; W, Trp; Y, Tye; V, Val (adapted
from Sharma and Bielski [377] with the permission of the American Chemical Society).
R CH NH COO
−
+ −
(
)
)
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