Dalton Transactions
Paper
a 2
The association constant (K ) of [Zn
L] with suc2− was
4
+
References
calculated from the changes of the fluorescent intensities
4
+
of [Zn
2
L] at λem 343 nm using a nonlinear curve-fitting and
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eqn (2):
(
ꢀ
ꢁ
Imax ꢀ I0
1
Ka
I ¼ I0 þ
½H0ꢁ þ ½G0ꢁ þ
2
½H0ꢁ
2009, 48, 3418; (d) B. Breiner, J. K. Clegg and J. R. Nitschke,
sffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi
ð2Þ
)
ꢀ
ꢁ
Chem. Sci., 2011, 2, 51; (e) L. Adriaenssens and P. Ballester,
Chem. Soc. Rev., 2013, 42, 3261.
2
1
Ka
ꢀ
½H0ꢁ þ ½G0ꢁ þ
ꢀ 4½H0ꢁ½G0ꢁ
2
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4
+
where I is the intensity of [Zn
2
L] at 343 nm in the presence of
4
+
the guest, I0 is the initial intensity of [Zn L] at 343 nm
without the guest, Imax is the intensity of [Zn
the presence of excess amount of the guest, [H
tration of [Zn L] , [G ] is the concentration of the guest, K =
2
4
+
2
L] at 343 nm in
] is the concen-
0
4
+
2
0
a
[
complex]/{[H
0
] × [G
0
]}.
Nonlinear curve-fitting tools of the Origin© (v.7.5) package
were used for calculating the value of Ka.
627.
3
(a) A. Natarajan, L. S. Kaanumalle, S. Jockusch,
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and E. Dalcanale, J. Am. Chem. Soc., 2009, 131, 2452;
(c) T. Murase, S. Horiuchi and M. Fujita, J. Am. Chem. Soc.,
2010, 132, 2866.
Job’s plots
4
+
Stock solutions of [Zn L] (0.0008 M) and the sodium salt of
2
different dicarboxylates (0.0008 M) were prepared in aqueous
solution (HEPES buffer, pH 7.40, 20 mM). Ten volumetric
flasks (10 mL) were filled with 500 μL solutions of the receptor
and the substrate in the following volume ratios: 50 : 450,
4 (a) T. Iwasawa, R. J. Hooley and J. Rebek Jr., Science, 2007,
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1
4
00 : 400, 150 : 350, 200 : 300, 250 : 250, 300 : 200, 350 : 150,
00 : 100, 450 : 50 and 500 : 0, and then extra HEPES buffer was
added to adjust the total concentration of the receptor and the
substrate to 4 × 10− M, and the corresponding fluorescence
emission curves were recorded.
5
For fum2−: a plot according to (1 − X) × (X × I
− I) versus X
0
4
+
was made, where X is the mole fraction of [Zn L] , I is the
initial fluorescence intensity at 398 nm without the addition of
the substrate, and I is the fluorescence intensity of [Zn
2
0
4
+
2
L] at
3
98 nm upon the addition of the substrate.
For suc : a plot according to (1 − X) × (I − X × I ) versus X
2
−
0
+
4
was made, where X is the mole fraction of [Zn
initial fluorescence intensity at 343 nm without the addition of
the substrate, and I is the fluorescence intensity of [Zn L] at
2
L] , I
0
is the
4
+
2
3
43 nm upon the addition of the substrate.
1
H NMR titration experiments
(
d) K. Uzarevic, I. Halasz, I. Dilovic, N. Bregovic, M. Rubcic,
1
4+
2
H NMR titration experiments of dicarboxylates with [Zn L]
D. Matkovic-Calogovic and V. Tomisic, Angew. Chem., Int.
Ed., 2013, 52, 5504.
(a) A. M. Costero, M. Colera, P. Gavina and S. Gil, Chem.
Commun., 2006, 761; (b) Y.-P. Tseng, G.-M. Tu, C.-H. Lin,
C.-T. Chang, C.-Y. Lin and Y.-P. Yen, Org. Biomol. Chem.,
were performed in DMSO-d –D O (2 : 1 v/v, pH 7.40) at room
temperature. The NMR solution of dicarboxylates (C ∼ 0.011 M)
was titrated in the NMR tubes with a stock solution of [Zn
6
2
8
4
+
2
L]
(
C ∼ 0.03 M). 9–10 data points were recorded.
2007, 5, 3592; (c) P. Mateus, R. Delgado, P. Brandão and
V. Félix, J. Org. Chem., 2012, 77, 4611.
9
J.-M. Chen, X.-M. Zhuang, L.-Z. Yang, L. Jiang, X.-L. Feng
and T.-B. Lu, Inorg. Chem., 2008, 47, 3158.
Acknowledgements
This work was supported by 973 Program of China 10 (a) F. Arnaud-Neu, S. Fuangswasdi, B. Maubert,
(
2
2012CB821705) and NSFC (grant no. 91127002, 21121061, and
0831005), and NSF of Guangdong Province (S2012030006240).
J. Nelson and V. McKee, Inorg. Chem., 2000, 39, 573;
(b) P. S. Lakshminarayanan, E. Suresh and P. Ghosh,
This journal is © The Royal Society of Chemistry 2013
Dalton Trans.