(Fc+/Fc) couple has E1/2 = 0.46 V with Epa − Epc = 80 mV
in dichloromethane and E1/2 = 0.50 V with Epa − Epc = 75
mV in DMF. No iR compensation was used. All electrochemical
measurements were carried out using Schlenk techniques (Ar) at
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22
1
◦C, unless otherwise specified, and the concentration of
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the supporting electrolyte was typically 0.15 M. Low temperature
experiments were conducted with the help of a thermostat
HAAKE mod. EK90.
Deposition on glass
Glass microscope slides were used as film substrates. They were
cleaned prior to use by immersion into a 1 : 1 mixture of
concentrated NH3 solution and 30+% H2O2 (CAUTION. This
mixture is highly corrosive and should be handled with care
under a ventilated fume hood and avoiding skin contact), then
rinsed with Millipore-Q water and dried under a steam of N2.
A droplet of a 10−6–10−5 M solution of 3 in dichloromethane or
chloroform (Aldrich, Spectral grade) was placed onto the glass
and evaporation was achieved in a covered chamber at 278 K
under gentle spinning. Images were obtained by using an optical
microscope Zeiss Axiovert S100, working in fluorescence and
transmission acquisition modes, with a CARV confocal module.
The microscope was equipped with Plan Neofluar 10×/n.a.0.3
and 50×/n.a.0.5 (long working distance) objectives. A 100 W Hg
lamp was used for fluorescence imaging.
Acknowledgements
The Authors thank MIUR (PRIN 2004) and CNR for financial
support. We gratefully acknowledge the Microanalytical Lab-
oratory, Department of Chemistry, University College Dublin,
Ireland for microanalyses.
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