scholarly journals Effect of Conjugation Length on Intrachain Chromophore−Chromophore Interaction in Silylene-Spaced Divinyloligoarene Copolymers

2005 ◽  
Vol 38 (4) ◽  
pp. 1442-1446 ◽  
Author(s):  
Yen-Ju Cheng ◽  
Sourav Basu ◽  
Shr-Jie Luo ◽  
Tien-Yau Luh
Keyword(s):  
Conjugation Length ◽  
Chromophore Interaction

scholarly journals Understanding the role of conjugation length on the self-assembly behaviour of oligophenyleneethynylenes

2021 ◽  
Author(s):  
Beatriz Matarranz ◽  
Goutam Ghosh ◽  
Ramesh Kandanelli ◽  
Angel Sampedro ◽  
Kalathil K. Kartha ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Conjugation Length ◽  
The Relationship

We unravel the relationship between conjugation length and self-assembly behaviour of oligophenyleneethynylenes (OPEs).

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

Unusual Redox Behavior of .alpha.-Oligoheteroaromatic Compounds: An Increasing First Oxidation Potential with Increasing Conjugation Length

1995 ◽  
Vol 7 (10) ◽  
pp. 1984-1989 ◽  
Author(s):  
J. A. E. H. van Haare ◽  
L. Groenendaal ◽  
H. W. I. Peerlings ◽  
E. E. Havinga ◽  
J. A. J. M. Vekemans ◽  
...  
Keyword(s):  
Oxidation Potential ◽  
Redox Behavior ◽  
Conjugation Length

Effect of N2 Ion Bombardment on Optical and Mechanical Properties of Ultra-High Molecular Weight Polyethylene (UHMWPE)

2013 ◽  
Vol 341 ◽  
pp. 169-180 ◽  
Author(s):  
A.M. Abdul-Kader ◽  
Y.A. El-Gendy ◽  
Awad A. Al-Rashdi ◽  
A.M. Salem
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Ion Beam ◽  
Surface Hardness ◽  
Conjugation Length ◽  
High Fluences ◽  
Pristine Sample ◽  
Optical And Mechanical Properties ◽  
Ultra High Molecular Weight

The effect of ion beam bombardment on the optical and mechanical properties of ultra-high molecular weight polyethylene (UHMWPE) was investigated. UHMWPE polymer samples were bombarded with 150 keV N2ions under vacuum at room temperature to high fluences ranging from 1x1016to 2x1017ions cm-2. The untreated as well as treated samples were investigated by ultraviolet-visible (UV-Vis) spectrophotometer and Vickers micro-hardness techniques. The direct and indirect optical band gap decreased from 2.9 and 1.65 eV for pristine sample to 1.7 and 1 eV for those bombarded with N2ion beam at the highest fluence, respectively. With increasing ion fluence, an increase in the number of carbon atoms per conjugation length, N and number of carbon atoms per cluster, M in a formed cluster were observed. A significant improvement in surface hardness was obtained by increasing the ion fluence.

scholarly journals Bromination and increasing the molecular conjugation length of the non-fullerene small-molecule acceptor based on benzotriazole for efficient organic photovoltaics

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13571-13578
Author(s):  
Na Zhang ◽  
Zhe Li ◽  
Can Zhu ◽  
Hongjian Peng ◽  
Yingping Zou
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Conjugation Length ◽  
Fused Ring

Two novel non-fullerene acceptors, namely BZIC-2Br and Y9-2Br, were synthesized by employing a ladder-type electron-deficient-based fused ring central with a benzotriazole core.

Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films

2018 ◽  
Vol 20 (38) ◽  
pp. 25085-25095 ◽  
Author(s):  
Vincent V. Duong ◽  
Alexander L. Ayzner
Keyword(s):  
Molecular Electronics ◽  
Organic Molecules ◽  
Electron Delocalization ◽  
Conjugation Length ◽  
Conjugated Organic Molecules ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Semiconductor Thin Films ◽  
Electronic Tunneling ◽  
Rate Limiting

Electron delocalization in conjugated organic molecules is a rate-limiting step in maximizing the photo conversion efficiency of next generation photovoltaics and molecular electronics.

scholarly journals Conjugation-Length Dependence of the T1Lifetimes of Carotenoids Free in Solution and Incorporated into the LH2, LH1, RC, and RC-LH1 Complexes:  Possible Mechanisms of Triplet-Energy Dissipation

Biochemistry ◽  
2007 ◽  
Vol 46 (51) ◽  
pp. 15208-15208
Author(s):  
Yoshinori Kakitani ◽  
Junji Akahane ◽  
Hidekazu Ishii ◽  
Hiroshi Sogabe ◽  
Hiroyoshi Nagae ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Length Dependence
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