This document summarizes two presentations from a group meeting. The first presentation discusses a new cholesterol-containing salen-based organogelator that gels several solvents into nanofibers. The gel exhibits aggregation-induced emission enhancement, displaying faint blue color in solution but bright green in the gel due to J-aggregate formation and restricted intramolecular rotation. It also shows reversible thermochromism and photochromism. The second presentation reports on block copolymers containing ruthenium metal complexes that link the blocks. The polymers self-assemble into micelles that can tune the material's elastic modulus depending on the chemical composition and block sizes of the copolymers.

1. Group Meeting
Literature

2. Emission Enhancement and
Chromism in a Salen-Based Gel
System
Peng Chen, Ran Lu, Pengchong
Xue, Tinghua Xu, Guojun Chen,
Yingying Zhao

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. 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. 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. The Molecule
• Cholesterol-containing salen-based gelator
• Excellent organogelator in cyclohexane,
benzene, toluene, other mixed solvents

7. The SEM etc.

8. Reversible
• Cyclohexane gel = Colourless hot
solutionyellow gel (as cooling)
• UV-Vis: Hot =
297 nm, 334 nm
• UV-Vis: RT =
480 nm

9. Reversible

10. Photochromism
• Irradiation of cyclohexane gel with 365 nm
light with variable irradiation times

11. Fluorescence
• Fluorescence quantum yield is 600 times greater in gel
than in solution 10-4
 10-2

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. 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. 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. Supramolecular Assembly
• Block co-polymers linked by Ru(II) complexes
• Change elastic modulus of material by varying
chemical composition

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. Synthesis A-Ru-B

18. Synthesis A-Ru-B-Ru-A

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. Structure-to-Function
• Flory-Huggins interaction parameter
• Volume fraction
• Tailor mechanical properties by varying
block size

21. Structure-to-Function

22. Structure-to-Function

23. Structure-to-Function
• Indentation-load displacement response

24. Structure-to-Function
• Increased % SPS = Increased stiffness
• Decreased % [Ru], % PF6
-
counterions
• Humidity check