Reversible Oxygenation of α-Amino Acid–Cobalt(II) Complexes
Table 2
Suitable pH, , and reversibility for the dioxygen uptake of 15 complexes.
L
Gly
Ala
Val
Ser
Thr
His
Pro
Met
Cys
Arg
Lys
Glu
Gln
Asn
Asp
362
365
368
368
366
320/374
380
365
347/442
366
365
365
365
365
365
pH③
8.5
9.5
9.0
9.5
9.5
8.0
10.5
10.0
7.0
9.5
10.5
10.5
10.0
10.0
11.5
OU④
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
UV⑤
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
OX⑥
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Notes: ③ suitable pH value for the test; ④ oxygen uptake performance; ⑤ reversible performance tested by UV-vis spectrum; ⑥ reversible performance tested by oxygen electrode.