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affected their electrooptical properties, thus resulted in
ultrahigh environment-sensitivity: fluorescent emission shifted
more than 200 nm in SiCs with different solvents. We have
rationalized the bathochromic shift of SiCs in different solvents
and significant NIR emission in protic solvents to the strong H-
bonding by Si in SiCs. After the distortion of a silicon atom, large
-electron delocalization, high electron density contribution of
carbonyl oxygen atoms in energy level and strong ICT effects in
SiCs have collaboratively faciliated the robust H-bonding
between the carbonyl oxygen and H-bond donating solvents.
SiC B has been successfully applied in monitoring the formation
of lipid droplets in mesenchymal stem cell lines C3H10T1/2 and
3T3-L1 in vivo. Further utility of the ultra-highly sensitivity to H-
bonding in SiCs for multicolor imaging at subcellular levels in
more complicated biosystems are currently underway and will
be published in due course. The conveniently structural
refinement of fluorophores by introduction of a silicon atom
with more desired properties has definitely provided
substantial endorsements for further investigation of
fluorophores and sophisticated biosystems.
Johnsson, Nat. Chem., 2013, 5, 132-139.
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The authors are grateful for the financial support from
National Natural Science Foundation of China (21705049,
21827814, 81830106), the Innovation Program of Shanghai
Municipal Education Commission (20170107005E00020) and
the Program for professor of Special Appointment (Eastern
Scholar TP2017039). The authors sincerely thank Prof. Xinran
Ma in East China Normal University for kindly providing the
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Conflicts of interest
There are no conflicts to declare.
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Notes and references
‡ Detailed experiments are available in Supporting Information,
SI. Crystal structure of SiC B is also available in SI (CCDC: 1939522).
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