Spectroscopic Studies of “Exciplex Tuning” for Dicyanoaurate(I) Ions Doped in Potassium Chloride Crystals

Abstract

Photoluminescence and Raman results for single crystals of KCl doped with KAu(CN) 2 with different Au content are presented and compared with results for pure KAu(CN) 2 crystals. Photoluminescence spectra of the doped crystals show three major UV-vis bands that can be resolved by varying the excitation wavelength. Spectroscopic and computational evidence suggests the formation of Au-Au bonded excimers and exciplexes in this doped system. The excimer/exciplex luminescence bands can be tuned in a given crystal by siteselective excitation and their relative intensities tuned by varying the dopant concentration. Microsecond lifetimes were observed for the various luminescence bands, suggesting Au-centered phosphorescent emissions. Raman spectral analysis was used successfully to correlate with the luminescence bands observed in pure and doped crystals of

Remarkable Luminescence Behaviors and Structural Variations of Two-Coordinate Gold(I) Complexes

“…The simple, stable dicyanoaurate ion has considerable utility in electroplating processes, as a bactericide, in the recovery of gold from mineral deposits, and in the manufacture of gold-ruby glass [30][31][32]. The luminescence observed from the dicyanoaurate ion in a variety of media show a remarkable "tunability", as demonstrated by a number of studies by Patterson, Omary, Fackler and coworkers [33][34][35][36]. Figures 4 and 5 show the luminescence obtained from the dicyanoaurate ion in various media.…”

“…Figures 4 and 5 show the luminescence obtained from the dicyanoaurate ion in various media. Figure 4 shows data collected from solutions of varying solvents and concentrations [36]. Figure 5 shows related [36] data [35], which arise from the dicyanoaurate ion in crystalline forms and in solution.…”

“…Figure 4 shows data collected from solutions of varying solvents and concentrations [36]. Figure 5 shows related [36] data [35], which arise from the dicyanoaurate ion in crystalline forms and in solution. As seen in these figures, the emission maxima for the simple [Au(CN) 2 ] -vary from 270 to 500 nm.…”

Polymorphism and luminescent behavior of linear, two-coordinate gold(i) complexes

“…For example, the luminescence from the industrially important ion [Au (CN)2] show multiple emissions whose relative intensities depend upon the doping level, temperature, and excitation wavelength (4). Upon excitation with near UV light, the colorless trimer, {Au I 3(MeN=COMe)3} displays a yellow emission with an unusually long lifetime (multi-exponential decay with = 1.4, 4.4 and 31 seconds) (5,6).…”

Luminescence and simulation of mixed metal nanoclusters of dicyanoargentate(I) and dicyanoaurate(I) in alkali halides

“…One important area of nanotechnology is the study of the clusters of d 8 and d 10 metal cyanide complexes [5][6][7][8][9][10][11][12][13][14]. These clusters show applications in optical memory [11], energy transfer [6], and emission tunability.…”