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cone cavity in aqueous solution. A similar metallacycle
31
showed
1
an affinity toward the oxalate guest, and the
H NMR titration
revealed that the NH
group interacted with the oxalate guests and
were concentration dependent [81].
2
Scheme 3
H
2
H
2
O
O
4+
O
NH
2
H
2
N
Zn
NH
2
Zn
H
2
N
NN
OH
Pt
O
Pt
O
O
O
O
O
O
N
N
i) -4H
+
ii) Zn
2+
O
O
OH
HO
M
e
N
N
OH
O
Pt
Pt
H
2
N
NH
2
N
N
NH
2
SO
3
30
H
2
N
O
29
28
Guests:
SiMe
3
(CH
2
)
3
SO
3
, Me(CH
2
)
n
SO
3
and
Me
SO
3
NH
2
Me
MeH
2
N
Ph
2
P
PPh
2
N
Pt
N
Au
+
Au
+
H
N
H
N
N
N
HN
NH
Pd
Pd
N
H
2
H
N
H
2
H
N
32
31
Pd
Pd
HN
NH
H
2
N
N
N
NH
2
Au
+
Au
+
N
N
Pt
Ph
2
P
PPh
2
MeH
2
N NH
2
Me
Scheme 10.3
Yip and coworkers reported luminescent Au(I)-based self-
assembly
rectangle
32
with
9,10-bis-(diphenylphosphino)
anthracene and 4,4
-bipyridine as the bridging ligands [82]. The
rectangle exhibited a cavity size of 7.92
′
×
16.73 Å and shows a very
e
×
5
−
1
−
1
intense band at 270 nm (
= 1.4
10
M
cm
), which corresponds
max
to the high-energy
transition of the anthracenyl rings. In
addition, there is a moderately intense absorption band in the range
320
1
π→π
*
480 nm, which displays vibronic peaks at 367, 390, 418, and
441 nm (
−
4
−
1
−
1
l
= 441 nm,
e
= 2.6
×
10
M
cm
). The absorption
max
max
1
π→π
*
band arises from the low-energy
transition of the anthracenyl
ring. On irradiating at 420 nm gives an emission maximized at 480
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