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Volume 40, Issue 1
  • ISSN: 0032-1400


The growth in research in molecular sized electronic devices in the very recent past, for functions such as optical switches, fast recording devices, miniaturised sensors and molecular computers, has created a need for equally small connectors which comply with the stringent requirements of such structures to link them to the surrounding assembly. Among materials that are suitable for the terminal subunits are polypyridyl complexes of ruthenium(II), osmium(II) and rhenium(I), linked together by bridging polyynes. The triplet excited states of these complexes have long lives and are formed under visible-light illumination. Their metal-to-ligand charge-transfer character allows electron promotion from the metal centre to the bridging ligand, giving directional electron transfer. Complexes based on ruthenium(II) or osmium(II) seem more promising due to their amenable absorption and emission spectral profiles and their facile oxidation-reduction processes. This paper looks at the development of the molecular materials and structures that are required to act as molecular-scale connectors enabling molecular-scale electronic devices to function successfully.


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  • Article Type: Research Article
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