All UV/Vis absorption spectra were carried out with a split-beam Olis upgraded Aminco DW-2000 spectrophotometer (Olis, Inc., Bogart, GA) equipped with a Quantum Northwest TLC50™ temperature-controlled cuvette holder (Quantum Northwest Inc., USA, Liberty Lake, WA). Each spectrum was collected over a wavelength range of 350-600 nm with 1 nm steps. Each reported spectra was an average of 10 scans. All spectra were plotted and analyzed with Igor Pro (version 6.34, WaveMetrics Inc.).
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