scholarly journals Rectifying Properties of Oligo(Phenylene Ethynylene) Heterometallic Molecular Junctions: Molecular Length and Side Group Effects

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Xiao-Xiao Fu ◽  
Rui-Qin Zhang ◽  
Guang-Ping Zhang ◽  
Zong-Liang Li
Keyword(s):  
Molecular Junctions ◽  
Side Group ◽  
Phenylene Ethynylene ◽  
Molecular Length ◽  
Group Effects

scholarly journals X-ray spectroscopy characterization of self-assembled monolayers of nitrile-substituted oligo(phenylene ethynylene)s with variable chain length

2012 ◽  
Vol 3 ◽  
pp. 12-24 ◽  
Author(s):  
Hicham Hamoudi ◽  
Ping Kao ◽  
Alexei Nefedov ◽  
David L Allara ◽  
Michael Zharnikov
Keyword(s):  
Chain Length ◽  
Photoelectron Spectroscopy ◽  
Self Assembled Monolayers ◽  
Phenylene Ethynylene ◽  
X Ray ◽  
Molecular Length ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Gold Thiolate

Self-assembled monolayers (SAMs) of nitrile-substituted oligo(phenylene ethynylene) thiols (NC-OPEn) with a variable chain length n (n ranging from one to three structural units) on Au(111) were studied by synchrotron-based high-resolution X-ray photoelectron spectroscopy and near-edge absorption fine-structure spectroscopy. The experimental data suggest that the NC-OPEn molecules form well-defined SAMs on Au(111), with all the molecules bound to the substrate through the gold–thiolate anchor and the nitrile tail groups located at the SAM–ambient interface. The packing density in these SAMs was found to be close to that of alkanethiolate monolayers on Au(111), independent of the chain length. Similar behavior was found for the molecular inclination, with an average tilt angle of ~33–36° for all the target systems. In contrast, the average twist of the OPEn backbone (planar conformation) was found to depend on the molecular length, being close to 45° for the films comprising the short OPE chains and ~53.5° for the long chains. Analysis of the data suggests that the attachment of the nitrile moiety, which served as a spectroscopic marker group, to the OPEn backbone did not significantly affect the molecular orientation in the SAMs.

scholarly journals Polybutadiene Vitrimers with Tunable Epoxy Ratios: Preparation and Properties

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4157
Author(s):  
Liqian Zhu ◽  
Li Xu ◽  
Suyun Jie ◽  
Bogeng Li
Keyword(s):  
Polymer Networks ◽  
Crosslinking Density ◽  
Side Group ◽  
Relaxation Properties ◽  
New Class ◽  
Crosslinked Polymer ◽  
Effective Exchange ◽  
Crosslinked Networks ◽  
Esterification Reactions ◽  
Group Effects

Traditional crosslinked diene rubber has excellent thermal–mechanical properties and solvent resistance, yet it is incapable of being recycled via universal molding or injecting. Vitrimers, a new class of covalently crosslinked polymer networks, can be topologically rearranged with the associative exchange mechanism, endowing them with thermoplasticity. Introducing the concept of vitrimers into crosslinked networks for the recycling of rubbers is currently an attractive research topic. However, designing tailored rubber vitrimers still remains a challenge. Herein, polybutadiene (PB) vitrimers with different structures were prepared via partial epoxidation of double bonds and ring-opening esterification reactions. Their mechanical and relaxation properties were investigated. It was found that the increasing crosslinking density can increase tensile strength and activation energy for altering the network topology. The influence of side-group effects on their relaxation properties shows that an increase in the number of epoxy groups on the polybutadiene chain can increase the chance of an effective exchange of disulfide units. This work provides a simple network design which can tune vitrimer properties via altering the crosslinking density and side-group effects.

scholarly journals Controlling Contact Configuration of Carboxylic Acid-Based Molecular Junctions Through Side Group

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Jun-Ren Huang ◽  
Hong Huang ◽  
Cai-Ping Tao ◽  
Ju-Fang Zheng ◽  
Ying Yuan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Molecular Junctions ◽  
Side Group ◽  
Contact Configuration

Diamine anchored molecular junctions of oligo(phenylene ethynylene) cruciform

2018 ◽  
Vol 29 (2) ◽  
pp. 271-275 ◽  
Author(s):  
Yuqing Liu ◽  
Marco Santella ◽  
Zhiqiang Fan ◽  
Xintai Wang ◽  
Xiangwei Jiang ◽  
...  
Keyword(s):  
Molecular Junctions ◽  
Phenylene Ethynylene

scholarly journals Structural versus Electrical Functionalization of Oligo(phenylene ethynylene) Diamine Molecular Junctions

2014 ◽  
Vol 118 (37) ◽  
pp. 21655-21662 ◽  
Author(s):  
M. Teresa González ◽  
Xiaotao Zhao ◽  
David Zsolt Manrique ◽  
Delia Miguel ◽  
Edmund Leary ◽  
...  
Keyword(s):  
Molecular Junctions ◽  
Phenylene Ethynylene

Temperature dependence of charge transport in solid-state molecular junctions based on oligo(phenylene ethynylene)s

2020 ◽  
Vol 31 (16) ◽  
pp. 164001
Author(s):  
Yuqing Liu ◽  
Mianzeng Zhong ◽  
Elisabeth Ffion Downey ◽  
Xiaoyao Chen ◽  
Tao Li ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Transport ◽  
Temperature Dependence ◽  
Molecular Junctions ◽  
Phenylene Ethynylene

Electron transport through single phenylene–ethynylene molecular junctions at low temperature

2004 ◽  
Vol 85 (4) ◽  
pp. 645-647 ◽  
Author(s):  
Saiful I. Khondaker ◽  
Zhen Yao ◽  
Long Cheng ◽  
Jay C. Henderson ◽  
Yuxing Yao ◽  
...  
Keyword(s):  
Electron Transport ◽  
Low Temperature ◽  
Molecular Junctions ◽  
Phenylene Ethynylene

Molecular Junctions Based on SAMs of Cruciform Oligo(phenylene ethynylene)s

Langmuir ◽  
2012 ◽  
Vol 28 (8) ◽  
pp. 4016-4023 ◽  
Author(s):  
Zhongming Wei ◽  
Tao Li ◽  
Karsten Jennum ◽  
Marco Santella ◽  
Nicolas Bovet ◽  
...  
Keyword(s):  
Molecular Junctions ◽  
Phenylene Ethynylene
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