Supporting Information
Synthesis and Characterization of Iridium(III) Cyclometalated Complexes with
Oligonucleotides: Insights into Redox Reactions with DNA
Fangwei Shao, Benjamin Elias, Wei Lu
†
and Jacqueline K. Barton*
Division of Chemistry and Chemical Engineering
California Institute of Technology, Pasadena, California 91125
Email: jkbarton@caltech.edu
Figure S1
. Absorption, emission and excitation spectra for
Ir1
and
Ir2
in CH
3
CN
(absorption) and CH
2
Cl
2
(emission/excitation). All the measurements are made at room
temperature under air.
Figure S2
. Cyclic voltamograms for Ir complexes.
Top
: Ir3;
middle
: Ir2;
bottom
: Ir1.
Fc
+
/Fc represents the oxidation peak of standard ferrocence. Working conditions are
described in materials and methods.
Figure S3
. Proposed mechanism and structure for the spin-trapping reaction of guanine
radicals in the presence of PBN.
S
2
0
0.2
0.4
0.6
0.8
1
1.2
200
250
300
350
400
450
500
550
600
U
V
A
b
s
o
r
p
t
i
o
n
(
a
.
u
.
)
(nm)
Ir-1
0
2
00
400
600
8
00
1000
300
400
500
600
700
800
Ir-1 Excitation
Ir-1 Emission
ex
=
412nm
em
=600nm
E
0-0
=504nm
[
Ir-1]=11.0
μ
M
L
u
m
i
n
e
s
c
e
n
c
e
I
n
t
e
n
s
i
t
y
(
a
.
u
.
)
(nm)
0
0.2
0.4
0.6
0.8
1
200 250 300 350 400 450 500 550 600
U
V
A
b
s
o
r
p
t
i
o
n
(
a
.
u
.
)
(nm)
Ir-2
0
200
400
600
8
00
1000
1200
300
400
500
600
700
Ir-2 Excitation
Ir-2 Emission
ex
=373nm
em
=676nm
E
0-0
=522nm
[Ir-2]=11.5
μ
M
L
u
m
i
n
e
s
c
e
n
c
e
I
n
t
e
n
s
i
t
y
(
a
.
u
.
)
(nm)
Figure S1
S
3
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
-40
-20
0
20
40
60
80
100
120
C
u
r
r
e
n
t
Voltage (V) vs Ag/AgCl
F
c
+
/
Fc
Figure S2.
S
4
Figure S3.
N
G
O
N
O
H
2
N
NH
N
HN
N
O
PBN
G
-
PBN
S
5