@article{BarakDhimanSturmetal.2022,
  author    = {Barak, Arvind and Dhiman, Nishant and Sturm, Floriane and Rauch, Florian and Lakshmanna, Yapamanu Adithya and Findlay, Karen S. and Beeby, Andrew and Marder, Todd B. and Umapathy, Siva},
  title     = {Excited-State Intramolecular Charge-Transfer Dynamics in 4-Dimethylamino-4′-cyanodiphenylacetylene: An Ultrafast Raman Loss Spectroscopic Perspective},
  series = {ChemPhotoChem},
  volume    = {6},
  journal   = {ChemPhotoChem},
  number    = {12},
  doi       = {10.1002/cptc.202200146},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-312280},
  year      = {2022},
  abstract  = {Photo-initiated intramolecular charge transfer (ICT) processes play a pivotal role in the excited state reaction dynamics in donor-bridge-acceptor systems. The efficacy of such a process can be improved by modifying the extent of π-conjugation, relative orientation/twists of the donor/acceptor entities and polarity of the environment. Herein, 4-dimethylamino-4′-cyanodiphenylacetylene (DACN-DPA), a typical donor-π-bridge-acceptor system, was chosen to unravel the role of various internal coordinates that govern the extent of photo-initiated ICT dynamics. Transient absorption (TA) spectra of DACN-DPA in n-hexane exhibit a lifetime of >2 ns indicating the formation of a triplet state while, in acetonitrile, a short time-constant of ∼2 ps indicates the formation of charge transferred species. Ultrafast Raman loss spectroscopy (URLS) measurements show distinct temporal and spectral dynamics of Raman bands associated with C≡C and C=C stretching vibrations. The appearance of a new band at ∼1492 cm\(^{-1}\) in acetonitrile clearly indicates structural modification during the ultrafast ICT process. Furthermore, these observations are supported by TD-DFT computations.},
  language  = {en}
}
@article{FosterEdkinsCameronetal.2014,
  author    = {Foster, Jonathan A. and Edkins, Robert M. and Cameron, Gary J. and Colgin, Neil and Fucke, Katharina and Ridgeway, Sam and Crawford, Andrew G. and Marder, Todd B. and Beeby, Andrew and Cobb, Steven L. and Steed, Jonathan W.},
  title     = {Blending Gelators to Tune Gel Structure and Probe Anion-Induced Disassembly},
  series = {Chemistry : A European Journal},
  volume    = {20},
  journal   = {Chemistry : A European Journal},
  doi       = {10.1002/chem.201303153},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-121141},
  pages     = {279-91},
  year      = {2014},
  abstract  = {Blending different low molecular weight gelators (LMWGs) provides a convenient route to tune the properties of a gel and incorporate functionalities such as fluorescence. Blending a series of gelators having a common bis-urea motif, and functionalised with different amino acid-derived end-groups and differing length alkylene spacers is reported. Fluorescent gelators incorporating 1- and 2-pyrenyl moieties provide a probe of the mixed systems alongside structural and morphological data from powder diffraction and electron microscopy. Characterisation of the individual gelators reveals that although the expected α-urea tape motif is preserved, there is considerable variation in the gelation properties, molecular packing, fibre morphology and rheological behaviour. Mixing of the gelators revealed examples in which: 1) the gels formed separate, orthogonal networks maintaining their own packing and morphology, 2) the gels blended together into a single network, either adopting the packing and morphology of one gelator, or 3) a new structure not seen for either of the gelators individually was created. The strong binding of the urea functionalities to anions was exploited as a means of breaking down the gel structure, and the use of fluorescent gel blends provides new insights into anion-mediated gel dissolution.},
  language  = {en}
}