Biology Reference
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Figure 9.3
1
H NMR spectra of the rectangle
11
recorded in CD
OD [22].
3
9.2.2.2 UV-Visible Absorption Studies
The electronic absorption spectrum of the compound
11
in methanol
e
-1
(Fig. 9.4) showed strong absorption bands at 424 nm (
= 27244 M
cm
-1
); 400 nm (
e
= 27355 M
-1
cm
-1
); 380 nm (
e
= 12658 M
-1
cm
-1
);
e
-1
-1
e
-
1
-1
353 nm (
= 12266 M
cm
), and 258 nm (
= 133176 M
cm
).
The peak at 258 nm was tentatively assigned to intra-ligand
π
→
π
*
*
transition [
π
→
π
(C
∫
C-An)]. The peaks corresponding to the
8
,
9
,
and
10
were similar to those for the complex
11.
Figure 9.4
Electronic absorption spectra for
11
in methanol based
×
10
-6
M and 3
×
10
-5
M (inset)
on the measurements in 3
solutions.
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