Iron and Manganese-Containing Flavonol 2,4-Dioxygenase Mimics
33
Fig. 3. Formation of manganese(II) and iron(III) flavonolate complexes.
Complex
M–O (Å)
(Å)
IR,
CO(cm-1)
UV-vis,
(nm)
(log )
Cu(fla) 2 a
Cu1–O1
Cu1–O2
1.942(2)
1.900(2) 0.042 1536 433 (4.56)
Mn(fla) 2 (py) 2 b
Mn1–O1
Mn1–O2
2.1839(18)
2.1274(16) 0.057 1542 433 (4.14)
[Mn(6Ph 2 TPA)(fla)]+c
Mn1–O1
Mn1–O2
2.143(3)
2.121(3) 0.022 1550 431 (4.24)
Fe(4’MeOfla) 3 b Fe1–O1
Fe1–O2
2.109(8)
1.955(7)
0.154 1547 411 (4.68)
Fe(fla)(salen)d Fe1–O1
Fe1–O2
2.139(4)
1.955(4)
0.184 1549 407 (4.25)
Fe(4’Clfla)(salen)d 1547 411 (4.15)
Fe(4’MeOfla)(salen)d 1542 445 (4.25)
Fe(4’NMe 2 fla)(salen)d 1536 426 (4.56)
Table 1. Spectroscopic and structural data for synthetic ES type complexes: a(Pap et al.,
2010); b(Kaizer et al, 2007); c(Grubel et al., 2010); d(Baráth et al., 2009).