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Group meeting

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Group meeting

  1. 1. Group Meeting Literature
  2. 2. Emission Enhancement and Chromism in a Salen-Based Gel System Peng Chen, Ran Lu, Pengchong Xue, Tinghua Xu, Guojun Chen, Yingying Zhao
  3. 3. Ran Lu • Jilin University • State Key Laboratory of Supramolecular Structure and Materials • 130 papers on Sci-Finder • 9 Mater. Chem. Phys. • 5 Langmuir • 5 J. Mater. Research • Various other ACS papers
  4. 4. Emission Enhancement and Chromism in a Salen-Based Gel System • Functional gelsenhanced charge transport, fluorescence, catalysis, sensing abilities • States that: “self-assembled properties of metal-salen complexes remains unexplored in the field of gels, although…”
  5. 5. J Aggregates • Salphen aggregates exhibit J-bands (bathochromic shift) • What about a gel system with thermochromism properties, based on salphen/salen type molecules with various metals?
  6. 6. The Molecule • Cholesterol-containing salen-based gelator • Excellent organogelator in cyclohexane, benzene, toluene, other mixed solvents
  7. 7. The SEM etc.
  8. 8. Reversible • Cyclohexane gel = Colourless hot solutionyellow gel (as cooling) • UV-Vis: Hot = 297 nm, 334 nm • UV-Vis: RT = 480 nm
  9. 9. Reversible
  10. 10. Photochromism • Irradiation of cyclohexane gel with 365 nm light with variable irradiation times
  11. 11. Fluorescence • Fluorescence quantum yield is 600 times greater in gel than in solution 10-4  10-2
  12. 12. Summary • New salen-based organogelator • Gels in several solvents • Moleculenanofibers3-D network • Aggregation-induced emission enhancement (AIE)  J-aggregates + no intramolecular rotation • Solutionfaint blue; Gelbright green • Reversible chromism due to NH/OH tautomerism
  13. 13. Supramolecular Assembly via Noncovalent Metal Coordination Chemistry: Synthesis, Characterization, and Elastic Properties Christina Ott, Johannes M. Kranenburg, Carlos, Guerrero-Sanchez, Stephanie Hoeppener, Daan Wouters, Ulrich S. Schubert
  14. 14. Ulrich S. Schubert • 710 papers on Sci-Finder • 92 Polymer Pre-prints • 55 Macromol. Rapid Comm. • 20 Macromol. Chem. Phys. • 17 Macromolecules • 13 Adv. Mater. • 12 Soft Matter • 12 J. Mater. Chem. • 9 J. Comb. Chem. • 2 management assistants, 9 supporting technical staff members, 9 guests (Dr.), 18 post-docs, 23 PhD students, 7 undergrads
  15. 15. Supramolecular Assembly • Block co-polymers linked by Ru(II) complexes • Change elastic modulus of material by varying chemical composition
  16. 16. Synthesis • Styrene co-polymersinert atmosphere; 1,1-diphenylethylene + sec-butyllithium in cyclohexane (turn red) + styrene; then added 4’-chloro-2,2’:6’,2’’-terpyridine = SPSn-[
  17. 17. Synthesis A-Ru-B
  18. 18. Synthesis A-Ru-B-Ru-A
  19. 19. Micelles • Polymers dissolved in THF and H2O added dropwise to induce aggregation of insoluble SPS block. More water added to “freeze” micelles. • SPS39-[Ru]-PEG70
  20. 20. Structure-to-Function • Flory-Huggins interaction parameter • Volume fraction • Tailor mechanical properties by varying block size
  21. 21. Structure-to-Function
  22. 22. Structure-to-Function
  23. 23. Structure-to-Function • Indentation-load displacement response
  24. 24. Structure-to-Function • Increased % SPS = Increased stiffness • Decreased % [Ru], % PF6 - counterions • Humidity check

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