Changes in vibrational circular dichroism (VCD) were recorded on-line during a
chemical reaction. The chiral complex nickel-(–)-sparteine chloride was
hydrolyzed to free (–)-sparteine base in a biphasic system of sodium hydroxide
solution and chloroform (CHCl3). Infrared (IR) and VCD spectra were
iteratively recorded after pumping a sample from the CHCl3 phase through a
lab-built VCD spectrometer equipped with a tunable mid-IR quantum cascade
laser light source, which allows for VCD measurements even in the presence of
strongly absorbing backgrounds. Time-dependent VCD spectra were analyzed by
singular value decomposition and global exponential fitting. Spectral features
corresponding to the complex and free (–)-sparteine could be clearly
identified in the fitted amplitude spectrum, which was associated with an
exponential decay with an apparent time constant of 127 min (t½ = 88 min)
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