Molecular Electronic Devices based on Ru(II) Thiophenyl Pyridine and Thienopyridine Architecture

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Steen, Robert,1978-Mälardalens högskola,Akademin för hållbar samhälls- och teknikutveckling,Simon Dunne, gruppen för molekylär elektronik (author)

Molecular Electronic Devices based on Ru(II) Thiophenyl Pyridine and Thienopyridine Architecture

BookEnglish2010

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Västerås :Mälardalen University,2010
92 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:mdh-10084
ISBN:9789186135799
https://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-10084URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

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Mälardalen University Press Dissertations,1651-4238 ;86

Notes

According to the famous axiom known as Moore’s Law the number of transistors that can be etched on a given piece of ultra-pure silicon, and therefore the computing power, will double every 18 to 24 months. However, around 2020 hardware manufacturers will have reached the physical limits of silicon. A proposed solution to this dilemma is molecular electronics. Within this field researchers are attempting to develop individual organic molecules and metal complexes that can act as molecular equivalents of electronic components such as wires, diodes, transistors and capacitors. In this work we have synthesized a number of new bi- and terdentate thiophenyl pyridine and pyridyl thienopyridine ligands and compared the electrochemical, structural and photophysical properties of their corresponding Ru(II) complexes with Ru(II) complexes of a variety of ligands based on 6-thiophen-2-yl-2,2'-bipyridine and 4-thiophen-2-yl-2,2'-bipyridine motifs. While the electrochemistry of the Ru(II) complexes were similar to that of unsubstituted [Ru(bpy)3]2+ and [Ru(tpy)2]2+, substantial differences in luminescence lifetimes were found. Our findings show that, due to steric interactions with the auxiliary bipyridyl ligands, luminescence is quenched in Ru(II) complexes that incorporate the 6-thiophen-2-yl-2,2'-bipyridine motif, while it was comparable with the luminescence of [Ru(bpy)3]2+ in the Ru(II) complexes of bidentate pyridyl thienopyridine ligands. The luminescence of the Ru(II) complexes based on the 4-thiophen-2-yl-2,2'-bipyridine motif was enhanced compared to [Ru(bpy)3]2+ which indicates that complexes of this category may be applicable for energy/electron-transfer systems. At the core of molecular electronics is the search for molecular ON/OFF switches. Based on the ability of the ligand 6-thiophen-2-yl-2,2'-bipyridine to switch reversibly between cyclometallated and non-cyclometallated modes when complexed with Ru(tpy) we have synthesized a number of complexes, among them a bis-cyclometallated switch based on the ligand 3,8-bis-(6-thiophen-2-yl-pyridin-2-yl)-[4,7]phenanthroline, and examined their electrochemical properties. Only very weak electronic coupling could be detected, suggesting only little, if any, interaction between the ruthenium cores.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Kemiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering hsv//eng
Molecular Electronics
Organic Synthesis
Ruthenium
Pyridyl Complexes
Ligand Design
Fused Ligands
Chemical engineering
Kemiteknik
Biotechnology/Chemical Engineering
bioteknik/kemiteknik

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Dunne, Simon,DocentMälardalens högskola,Akademin för hållbar samhälls- och teknikutveckling(Swepub:mdh)sjd01 (thesis advisor)
Angus-Dunne, Sarah (thesis advisor)
Wärnmark, Kenneth,DocentLunds Universitet, Kemiska Institutionen, Avdelningen för Organisk Kemi (opponent)
Mälardalens högskolaAkademin för hållbar samhälls- och teknikutveckling (creator_code:org_t)

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