Phosphorescent Organogels via “Metallophilic” Interactions for Reversible RGB−Color Switching
- 14 December 2004
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 127 (1), 179-183
- https://doi.org/10.1021/ja0441007
Abstract
A trinuclear Au(I) pyrazolate complex bearing long alkyl chains (1) in hexane self-assembles via a Au(I)-Au(I) metallophilic interaction, to form a red-luminescent organogel (lambda(em) = 640 nm, lambda(ext) = 284 nm). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis of an air-dried gel with 1 show the presence of heavily entangled fibers, each consisting of a rectangularly packed columnar assembly of 1. Doping of the organogel with a small amount of Ag(+) results in a blue luminescence (lambda(em) = 458 nm, lambda(ext) = 370 nm) without disruption of the gel, while removal of doped Ag(+) with cetyltrimethylammonium chloride results in complete recovery of the original red-luminescent gel. Upon heating, these organogels undergo gel-to-sol transition due to the destabilization of the metallophilic interactions, where the red luminescence of the nondoped system becomes hardly visible, while the blue luminescence of the Ag(+)-doped system turns green (lambda(em) = 501 nm, lambda(ext) = 370 nm). On cooling, these solutions undergo gelation and synchronously recover the original luminescences. The observed RGB (red-green-blue) luminescences are all long-lived (3-6 micros) and assigned to electronic transitions from triplet-excited states.Keywords
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