نتایج جستجو برای: pi-conjugated molecules

تعداد نتایج: 260574  

Journal: :physical chemistry research 2014
mohammed bouachrine najat belghiti mohammed nassiri bennani simohamed bouzzine mohamed hamidi

the research in the short-chain organic -conjugated molecules has become one of the most interesting topics in the fields of chemistry. these compounds have become the most promising materials for the optoelectronic device technology. the use of low band gap materials is a viable method for better harvesting of the solar spectrum and increasing its efficiency. the control of the band gap of th...

Journal: :The journal of physical chemistry. A 2005
Miquel Torrent-Sucarrat Miquel Duran Josep M Luis Miquel Solà

In previous works we have shown that certain pi-conjugated organic molecules possess nontotally symmetric vibrations that break the maximum hardness (MHP) and minimum polarizability principles (MPP). We have also derived a set of simple rules to determine a priori without calculations whether a particular pi-conjugated organic molecule violates these two principles. In the present work, we gene...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2004
Jennifer E Klare George S Tulevski Colin Nuckolls

The study below details the synthesis and self-assembly of new cruciform pi-systems and their in situ chemical reactions in monolayer films. Analysis of the packing in the crystal structure of one of these unusually shaped molecules reveals that the terphenyl arm, which is twisted out of conjugation, makes edge-to-face contact with neighboring molecules aligning the conjugated bisoxazole arms i...

Journal: :Journal of the American Chemical Society 2010
Santiago Martín Iain Grace Martin R Bryce Changsheng Wang Rukkiat Jitchati Andrei S Batsanov Simon J Higgins Colin J Lambert Richard J Nichols

The realization of molecular-scale electronic devices will require the development of novel strategies for controlling electrical properties of metal/molecule/metal junctions, down to the single molecule level. Here, we show that it is possible to exert chemical control over the formation of metal/molecule...molecule/metal junctions in which the molecules interact by pi-stacking. The tip of an ...

Journal: :The journal of physical chemistry. B 2005
Alexei V Tivanski Yufan He Eric Borguet Haiying Liu Gilbert C Walker David H Waldeck

Single-molecule electrical conduction studies are used to evaluate how the molecular linking unit influences the tunneling efficiency in metal-molecule-metal (m-M-m) junctions. This work uses conducting-probe atomic force microscopy (CP-AFM) to compare the molecular conduction of two pi-bonded molecules: one with a single thiol linker, and another with a conjugated double thiol linker at both e...

Journal: :Organic letters 2004
Xiao-Yu Cao Wei Zhang Hong Zi Jian Pei

[structure: see text] A series of novel extended pi-conjugated twin molecules based on 10,15-dihydro-5H-diindeno[1,2-alpha;1',2'-c]fluorene (truxene) have been prepared via Pd(0)-catalyzed Suzuki coupling, Sonogashira coupling, and McMurry reactions, respectively. 9,9'-Spirobifluorenylene, ethynylene, and vinylene groups as the bridge are introduced to connect both truxene moieties to understan...

Journal: :NIPPON GOMU KYOKAISHI 2008

Journal: :Chemistry 2007
Tomohiro Agou Junji Kobayashi Takayuki Kawashima

Ladder-type pi-conjugated molecules bearing heteraborin (azaborine or thiaborin) units were synthesized, and X-ray crystallographic analysis of pentacene-type molecules showed that these molecules have rigid and planar structures. UV-visible spectroscopy and theoretical calculations revealed the enhancement of electronic interaction between heteraborin units, the decrease in HOMO-LUMO energy ga...

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