Pleas De ad l to o nn oT tr aa nd sj au cs t ti omn as rgins
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COMMUNICATION
Journal Name
DOI: 10.1039/C9DT017ty80A
asymmetric feature, an organically-modified Anderson- pe
POM bearing conjugate groups connecting alkyl chains
performed morphologic evolution from sphere to nanowire, plate,
and helical assemblies, with the modulation of solution polarity
from polar to non-polar change. The morphologic
transformations can be concluded to be dominated by the
assembly structure under different environments. More
importantly, the chirality deriving from organic countercations
can not only be transferred into inorganic cluster but also
amplified in the formed helical assemblies, which are not dealt
with before in POM related systems. In addition to the effect of
solvents, such chirality transfer and amplification could be very
important for chiral applications of POMs such as asymmetric
catalysis and chiral luminescence because in principle, the
present strategy does not require especial structural modification,
which may limit the properties of functional POMs.
6 6
Fig. 3 (a) UV-Vis spectra of TBA-MnMo , S-MnMo , and S-
BPEA∙Cl in CH
of R-MnMo , S-MnMo
CHCl /n-C 14 with different volume ratio (0.1 mg/mL) at 20°C,
and TEM images of (c) R-MnMo and (d) S-MnMo in CHCl /n-
14 (9:1 in v/v).
3
OH (0.1 mg/mL), (b) circular dichroism spectra
6
6
and their racemic mixture in solvent
3
6
H
Conflicts of interest
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6
3
C
6
H
There are no conflicts to declare.
morphology (Fig. S26). This is quite similar to the assemblies
comprising of POMs covering with the same chiral cations in the Acknowledgements
literature20 and can be explained as lacking strong control of the
The authors acknowledge the financial supports received from
the National Natural Science Foundation of China (21773090,
1574057), the Changbaishan Distinguished Professor Funding
of Jilin Province, and the Program for JLU Science and
Technology Innovative Research Team (2017TD-10), Project of
Educational Commission of Jilin Province of China
binding force in the solvent.20 Interestingly, with the addition of
n-hexane, beside those induced Cotton signals, the enhancement
of signal intensity is also observed under the same concentration
as that in chloroform. An increased signal is detected with the
increase of n-hexane fraction up to 10%, which indicates the
effect of chirality amplification in the self-assemblies. Both SEM
and AFM characterizations provide the helical morphologic
images on the asymmetric self-assembly of chiral cation
2
(JJKH20190116KJ).
6
combined MnMo complexes (Fig. S27−28). Further TEM
Notes and references
measurement not only demonstrates the helical assembly
structure but also points out the layered packing of the hybrid
cluster complexes in asymmetrically twisted state (Fig. 3c−3d).
1
M. T. Pope and A. Müller, Angew. Chem. Int. Ed. Engl., 1991,
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Chem. Rev., 2019, 378, 281−309.
Different from the self-assembly of Na-MnMo
6
and TBA-
in polar solvents, the XRD results show that R-/S-
complexes possess a bigger layer thickness at ca. 3.9 nm
2
3
4
5
S. S. Wang and G. Y. Yang, Chem. Rev., 2015, 115,
MnMo
MnMo
6
4
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6
(Fig. S29). As this layer spacing value is much larger than the
2
folding state (ca. 2.5 nm) of the complex, the complete
interdigitation becomes no longer suitable to explain the packing
structure. Although the complex could adopt a tilted packing in
a full spreading form, the over interdigitation (Scheme 2) is more
likely due to the original interdigitated state of the racemic
mixture in chloroform solution, based on the thickness value of
ca. 2.7 nm (Fig. S30). In comparison to that chloroform is soluble
6
Y. Zhang, L. L. Wu, X. Y. Zhao, Y. N. Zhao, H. Q. Tan, X.
Zhao, Y. Y. Ma, Z. Zhao, S. Y. Song, Y. H. Wang and Y. G.
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for both hydrophobic and hydrophilic parts of R-/S-MnMo
6
4
067−4072; C. Falaise, M. A. Moussawi, S. Floquet, P. A.
complexes, the addition of n-hexane provides an incompatible
environment, which drives the hydrophilic cluster moiety to be
in tight packing while hiding itself inside of the layered structure
to reduce the interfacial energy.
Abramov, M. N. Sokolov, M. Haouas and E. Cadot, J. Am.
Chem. Soc., 2018, 140, 11198−11201.
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Conclusions
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| J. Name., 2012, 00, 1-3
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