ic7b01031_si_001.pdf (4.72 MB)
Fluorescent and Electrochemical Supramolecular Coordination Polymer Hydrogels Formed from Ion-Tuned Self-Assembly of Small Bis-Terpyridine Monomer
journal contribution
posted on 2017-06-19, 22:20 authored by Xudong Yu, Zengyao Wang, Yajuan Li, Lijun Geng, Jujie Ren, Guoliang FengHerein, ditopic ligand DTA comprised of terpyridine
and acetylene segments with only one aromatic π-conjugated building
block was designed and synthesized. Driven by metal–ligand
coordination interactions, we presented that the use of metal salts
can direct the self-assembly of DTA in the generation
of fluorescent and electrochemical polymers that entrapped water to
form ambidextrous hydrogels. These were characterized by several approaches
including fluorescent titrations, UV–vis, circular dichroism,
and X-ray diffraction spectra as well as scanning electron microscopy
and transmission electron microscopy experiments. DTA can selectively recognize Zn2+ ions and gelate water
in the presence of ZnC6H10O6 (zinc
lactate), giving Zn2+-specific fluorescent metallogels.
Otherwise, DTA/Cu(OAc)2 forms nonfluorescent,
electrochemical, and chiral hydrogel that responds to multiple stimuli
such as heat, light, shearing, electrolysis, and reducer. The ion-controlled
gelation approach, morphology, rheology, as well as fluorescent and
chiroptical properties of DTA was studied in detail.
Hence, our work demonstrated for the first time the crucial role of
metal salts in the supramolecular polymerization and corresponding
properties, in which symmetry breaking played an important role for
the dynamic assembly difference.