ORCID Profile
0000-0001-8066-0559
Current Organisation
York University
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Publisher: Wiley
Date: 10-07-2013
Publisher: American Chemical Society (ACS)
Date: 14-02-2014
DOI: 10.1021/OL500129P
Abstract: Inspired by naturally occurring helical supramolecular architectures, a series of chiral conjugated phospholes with a cholesteryl pendant have been synthesized and characterized. The photophysically and electrochemically active conjugated phosphole species can act as dopants for the formation of chiral liquid crystals. The supramolecular structures were found to be tunable by careful choice of the conjugated headgroup as well as the rigidity of the linker of the new cholesteric phospholes.
Publisher: American Chemical Society (ACS)
Date: 29-09-2011
DOI: 10.1021/JA206784F
Abstract: A series of new hiphilic phosphonium materials that combine the electronic features of phospholes with self-assembly features of lipids were synthesized. Variable concentration/temperature and 2D NMR studies suggested that the systems undergo intramolecular conformation changes between a "closed" and "open" form that are triggered by intermolecular interactions. The hiphilic features of the phospholium species also induce liquid crystalline and soft crystal phase behavior in the solid state, which was studied by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and variable temperature powder X-ray diffraction (VT-PXRD). The studies revealed that both conjugated backbones and counteranions work together to organize the systems into different morphologies (liquid crystal/soft crystal). Dithieno[3,2-b:2',3'-d]phosphole-based compounds exhibit enhanced emission in the solid state and at low temperature in solution due to aggregation-induced enhanced emission (AIEE). Photoinduced electron transfer (PET) induced via the alkoxybenzyl group at the phosphonium center in the fused-ring systems can be effectively suppressed through intermolecular charge transfer (ICT) processes within the main scaffold of a nonfused system, which was confirmed by static and dynamic fluorescence spectroscopy. The dynamic features of these new materials also endow the systems with external-stimuli responsive photophysical properties that can be triggered by temperature and/or mechanical forces.
Publisher: Wiley
Date: 02-03-2012
Abstract: Sensitive gels: the hiphilic features of phosphole-lipids lead to intriguing self-assembly properties and the formation of highly fluorescent organogels. Moreover, the dynamic structural features of the system make it possible to lify the mechanochromic emission shifts (100 nm) in a donor-acceptor system through thermally and mechanically responsive fluorescence resonance energy transfer (FRET).
Publisher: Wiley
Date: 08-08-2013
Location: Germany
No related grants have been discovered for Thomas Baumgartner.