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Issue 6, 2014
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In search of structure–function relationships in transition-metal based rectifiers

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Abstract

Heterometallic chains have been proposed as potential current rectifiers in molecular electronics, their left–right asymmetry providing, at least in principle, a mechanism for differentiation of current flow in forward and reverse directions. Here we compare two known extended metal atom chains (EMACs), Ru2Ni(dpa)4(NCS)2 and Ru2Cu(dpa)4(NCS)2, both of which meet the first criterion for rectification in so much as they are physically asymmetric. In both cases the dominant transport channel is a doubly degenerate π* orbital localised, to a first approximation, on the Ru2 unit. As a result, current is limited by tunnelling across the Au–SCN–Ni/Cu junction. The paramagnetic Ni centre tunes the left–right delocalisation of the channel, making the minority-spin (β) channel more transparent than its spin-α counterpart and this difference provides the basis for asymmetry in the current under forward and reverse bias.

Graphical abstract: In search of structure–function relationships in transition-metal based rectifiers

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Supplementary files

Article information


Submitted
19 Mar 2014
Accepted
30 Apr 2014
First published
05 May 2014

Inorg. Chem. Front., 2014,1, 468-477
Article type
Paper
Author version available

In search of structure–function relationships in transition-metal based rectifiers

T. Weng, D. DeBrincat, V. Arcisauskaite and J. E. McGrady, Inorg. Chem. Front., 2014, 1, 468
DOI: 10.1039/C4QI00038B

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