Chemistry / Kimya

Permanent URI for this collectionhttps://hdl.handle.net/11147/4072

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Subject: search.filters.subject.Organic polymersWoS Q: search.filters.wosQuartile.Q1

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Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 41
    Citation - Scopus: 44
    Vapor Phase Solvatochromic Responses of Polydiacetylene Embedded Matrix Polymers
    (Royal Society of Chemistry, 2017) Tu, Meng-Che; Cheema, Jamal Ahmed; Yıldız, Ümit Hakan; Palaniappan, Alagappan; Liedberg, Bo
    The solvatochromic response of polydiacetylene (PDA) in the vapor phase is enabled upon incorporation with matrix polymers such as polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), polyacrylic acid (PAA), and poly-4-vinylpyridine (P4VP). The matrix polymers provide a soft/gel-like framework for accommodating photopolymerized PDA, while facilitating its conformational alternations upon interaction with preconcentrated volatile organic compounds (VOCs). The matrix polymers enabled the differentiation of VOCs owing to their varying morphology, chemical affinity and solubility in VOCs. The ratios between PDA and the matrix polymers are optimized according to the obtained solvatochromic responses evaluated in varying temperature, humidity and storage conditions. As a proof of concept, a finger-print array for differentiation of 7 VOCs is demonstrated using matrix polymer-embedded PDA. The obtained results indicate that the response time and sensitivity of the proposed methodology supersedes previous reports on solvatochromic VOC assays. Furthermore, the proposed methodology would enable differentiation of a wide range of VOCs upon incorporation of additional matrix polymers with varying sorption properties.
  • Article
    Citation - WoS: 5
    Citation - Scopus: 6
    Donor- And/Or Acceptor-Substituted Expanded Radialenes: Theory, Synthesis, and Properties
    (American Chemical Society, 2014) Ramsaywack, Sharwatie; Karaca, Sıla; Gholami, Mojtaba; Murray, Adrian H.; Hampel, Frank; McDonald, Robert; Elmacı, Nuran; Lüthi, Hans Peter; Tykwinski, Rik R.
    The synthesis of donor- (D) and/or acceptor (A)-expanded [4]radialenes has been developed on the basis of readily available dibromoolefin (7), tetraethynylethene (10 and 20), and vinyl triflate (12) building blocks. The successful formation of D/A radialenes relies especially on (1) effective use of a series alkynyl protecting groups, (2) Sonogashira cross-coupling reactions, and (3) the development of ring closing reactions to form the desired macrocyclic products. The expanded [4]radialene products have been investigated by spectroscopic (UV-vis absorption and emission) and quantum chemical computational methods (density functional theory and time dependent DFT). The combined use of theory and experiment provides a basis to evaluate the extent of D/A interactions via the cross-conjugated radialene framework as well as an interpretation of the origin of D/A interactions at an orbital level.