Conference Programme

The overview and detailed programme is posted below.

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Overview
Session
C-01: Symp C
Time:
Monday, 19/Jun/2017:
1:30pm - 3:30pm

Session Chair: Qichun Zhang, Nanyang Technological University
Location: Rm 325

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Presentations
1:30pm - 2:00pm
Invited

Acenedithiophene Quinoidals: Synthesis and Applications

Kazuo TAKIMIYA

RIKEN Center for Emergent Matter Science, Japan

Acenedithiophenes, represented by benzodithiophenes (BDT), naphthodithiophenes (NDT), and anthradithiophenes (ADT), have been an important class of pi-frameworks for developing new small-molecule semiconductors and semiconducting polymers [1]. Thanks to their extended pi-system, they have generally high-lying HOMO suitable to p-type organic semiconductors and building blocks for semiconducting polymers. In fact, the small-molecule semiconductors based on ADT [2] and semiconducting polymers based on BDT [3] have played important role in the solution-processed OFET and OPVs, respectively. On the other hand, one of the structural characteristics of acenedithiophenes is to possess two terminal thiophene rings, which provide chemically reactive sites for further modification. By such chemical modifications, it is possible to incorporate acenedithiophene framework into quinoidal conjugation system terminated with ketone, dicyanomethylene, or other groups. In this contribution, we present the synthesis and characterization of a series of acenedithiophene quinoidals, and their potential applications to n-type organic semiconductors [4,5].

References:

[1] Nakano et al. J. Org. Chem. 2012, 77, 8099–8111.

[2] Anthony et al. J. Am. Chem. Soc. 2005, 127, 4986–4987.

[3] Yu et al. Adv. Mater. 2014, 26, 4413–4430.

[4] Suzuki et al. J. Am. Chem. Soc. 2010, 132, 10453–10466.

[5] Mori et al. Org. Lett. 2014, 16, 1334–1337.


2:00pm - 2:30pm
Invited

pi-Electron Conjugation in Two Dimensions

Dmitrii PEREPICHKA

McGill University, Canada

One-dimensional conjugated organic polymers are important optoelectronic materials with tunable properties and myriads of applications. Two-dimensional (2D) inorganic materials, such as graphene, display a spectrum of unprecedented properties that fundamentally impact the solid state physics. It would thus be intriguing to be able to combine the tunability of an organic polymer and 2D electron confinement in a single material – a 2D pi-conjugated polymer.[1] The lecture will discuss how a 2D polymer network can be assembled from pi-functional building blocks, and how the structure and connectivity of the latter define the properties of the material. It will present our approaches to growing such materials via surface-templated polymerization [2] and through dynamic covalent polymerization in solution.[3] The novel properties resulting from the pi-electron delocalization (conjugation) in 2D systems will be also be discussed.

References:

[1] D. F. Perepichka, F. Rosei, Science 2009, 323, 216. R. Gutzler, D. F. Perepichka, J. Am. Chem. Soc. 2013, 135, 16585.

[2] L. Cardenas et al. Chem. Sci. 2013, 4, 3263; R. Gutzler et al. Nanoscale 2014, 6, 2660; G. Vasseur, Nat. Comm. 2016, 7, 10235.

[3] M. R. Rao, Y. Fang, S. De Feyter, D. F. Perepichka, J. Am. Chem. Soc. 2017, just accepted (ja-2016-120054.R2).


2:30pm - 3:00pm
Invited

Area-Selective Growth of Functional Molecular Architectures: Toward High Resolution Addressable Organic Devices

Lifeng CHI1, Wenchong WANG2

1Soochow University, China; 2University Muenster, Germany

Over the last three decades, organic semiconductors have attracted increasing attention because of the applications of their inorganic counterparts in a growing number of devices. Further success of these materials will require device processing techniques to produce high performance and high integration over large areas. Conventional top-down patterning techniques based on photolithography have served powerful methods for the surface patterning of inorganic materials. However, they cannot be simply transferred to organic semiconductors due to the fragile properties of small organic molecules.

We have been working over years on developing methods for patterning small organic molecules that are compatible with standard device processing procedures for inorganic semiconductors. The main results will be summarized here. The concept is based on classic growth dynamics by gas-phase deposition but leads to different selective growth mechanisms, resulting patterned organic functional materials at defined areas at sub-micrometer resolutions. The techniques can do even more than patterning. We demonstrate that these techniques can produce 3D patterning of organic structures that cannot be obtained by conventional photolithography and printing techniques. Through a combination of different growth modes, we can separate molecules at given locations on the micro-scale, achieve tunable multi-color patterns using two types of molecules, and fabricate fine addressable organic structures taking advantage of un-isotropic wetting. We also show that the strategy can be utilized to process large area OLED and OFET arrays, leading to devices with improved performance in features such as carrier mobility. The strategy further shows the ability to cross-talk free explore organic electronics with high-level integration and addressability.


3:00pm - 3:30pm
Invited

Design of Optical Functional Conjugated Molecules for Sensing and Biomedical Applications

Shu WANG

Institute of Chemistry, Chinese Academy of Sciences, China

Water-soluble conjugated polymers (CPs) provide a unique platform for chemical and biological sensors in view of their optical signal amplification effect. Our recent studies showed that CPs/DNA complexes combing with fluorescence resonance energy transfer (FRET) processes could be used for detecting disease-related gene modifications, such as single nucleotide polymorphisms (SNPs), mutations and DNA methylation. In recent years, the CPs integrating recognition, imaging and therapeutic functions have attracted more and more attention. We developed a new technique for preparing multicolor microparticles based on the self-assembly of bacteria and CPs. They can be successfully applied for cell imaging and optical barcoding. A polythiophene-porphyrin dyad was prepared for effectively killing neighboring cells. This multifunctional material that simultaneously provides therapeutic action and image the results provide new strategies for the treatment of various diseases. A cationic poly(p-phenylene vinylene) derivate bearing polyethylene glycol (PEG) side chains was also synthesized and used for selective recognition, imaging and killing of bacteria over mammalian cells. This material exerts a far-reaching impact on the future development of antimicrobial materials. These results exhibit that the multi-functional conjugated polymers are ideal platforms for recognition, imaging and disease therapy.

References:

[1] H. Bai, H. Yuan, C. Nie, B. Wang, F. Lv, L. Liu, S. Wang, Angew. Chem. Int. Ed. 2015, 54, 13208-13213.

[2] C. Nie, S. Li, B. Wang, L. Liu, R. Hu, H.Chen, F. Lv, Z. Dai, S. Wang, Adv. Mater. 2016, 28, 3749-3754.

[3] H. Yuan, H. Chong, B. Wang, C. Zhu, L. Liu, Q. Yang, F. Lv, S. Wang, J. Am. Chem. Soc. 2012, 134, 13184-13187.

[4] Q. Yang, D. Ying, W. Wu, C. Zhu, H. Chong, J. Lu, D. Yu, L. Liu, F. Lv, S. Wang, Nat. Commun. 2012, 3, 1206.



 
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