Synthesis of ruthenium (III) phthalocyanine with di-axial bromo ligands - a promising molecular conductor with giant negative magnetoresistance

College

College of Science

Department/Unit

Chemistry

Document Type

Article

Source Title

Current Chemistry Letters

Issue

4

First Page

1

Last Page

6

Publication Date

2015

Abstract

The electron transport of Phthalocyanines (Pc) with central metal and di-axial ligands (such as FeIII(Pc)L2; where L = CN, Cl, Br) originates from its intermolecular Pc - orbital overlap while its giant negative magnetoresistance (GNMR) arises from its intramolecular Pc(HOMO) and Fe-d (s=1/2) interaction. However, the -d interaction tends to localize itinerant electrons resulting in the decrease in the conductivity of the FeIII(Pc)L2 series compared to the non-magnetic CoIII(Pc)L2 where -d interaction is absent. More so, the axial ligand field energy of the FeIII(Pc)L2 system is found to have the ability to proportionally modulate the -d interaction. In reference thereof, theoretical calculations point that isostructural RuIII(Pc)Br2 would provide the best balance of -d orbital energy interplay. That is, RuIII(Pc)Br2 is expected to be a molecule with high electrical conductivity and GNMR which would make it an ideal magnetic molecular conductor. This paper reports on the synthesis of RuIII(Pc)Br2.

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Disciplines

Chemistry | Materials Chemistry

Keywords

Phthalocyanines; Molecular electronics

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