THESIS
2012
xxxviii, 299 p. : ill. (some col.) ; 30 cm
Abstract
Development of luminescent materials with advanced properties is of great importance to
satisfy the need of modern society and technology. A novel phenomenon has recently been
observed: a group of nonluminescent molecules with propeller-shaped structures are induced
to emit efficiently by aggregate formation. “Aggregation-induced emission” (AIE) is termed
for such novel effect. The AIE phenomenon was first realized in small molecules and now has
extended to polymeric system. Construction of π-conjugated polymers from acetylenic
monomers has emerged as useful techniques for the synthesis of advanced specialty polymers
with novel molecular structures and unique functional properties. Attracted by the intriguing
AIE phenomenon and the importance of exploration of new acetylene poly...[
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Development of luminescent materials with advanced properties is of great importance to
satisfy the need of modern society and technology. A novel phenomenon has recently been
observed: a group of nonluminescent molecules with propeller-shaped structures are induced
to emit efficiently by aggregate formation. “Aggregation-induced emission” (AIE) is termed
for such novel effect. The AIE phenomenon was first realized in small molecules and now has
extended to polymeric system. Construction of π-conjugated polymers from acetylenic
monomers has emerged as useful techniques for the synthesis of advanced specialty polymers
with novel molecular structures and unique functional properties. Attracted by the intriguing
AIE phenomenon and the importance of exploration of new acetylene polymerizations, as well as the fascinating perspectives of the resulting polymers, I have launched a program
direct towards the development of new AIE materials, including both small molecules and
high molecular weight polymers, and exploration of their potential applications in optics,
electronics and photonics.
A series of propeller-like AIE luminogens have been designed and synthesized. Thanks to
their high fluorescence quantum efficiencies in the solid state, light-emitting devices are
fabricated and fluorescent sensors for detection of explosives and metal ions are developed.
Taking the advantage of their good processability, π-conjugated (co)polymers with AIE
features are prepared by introducing AIE-active moieties to the polymer structures using
metathesis polymerization and Glaser-Hay oxidative coupling reaction. To further enrich the
family of acetylenic polymers, new polymerization routes from triple-bond building blocks
are explored, examples of which are indium-catalyzed three-component polycoupling of
diynes with dialdehydes and secondary amines and polycyctotrimerization of dinitriles. The
structures and properties of the AIE materials are carefully characterized and evaluated by
standard spectroscopic techniques such as IR, NMR, TGA, DSC, UV, PL, XRD, SEM, TEM
and VSM analyses, from which an array of advanced functional properties and high-tech
applications of the luminogenic materials, such as high light refractivity, fluorescent
chemosensors, fluorescent photopatterning and precursors to magnetic ceramics, are
discovered.
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