摘要:
The racemate of the chiral tricarbonyl-eta(6)- arene- chromium( 0) complex, tricarbonyl- eta(6)- N- pivaloyl- tetrahydroquinoline- chromium( 0), 1, has been synthesized and resolved using chromatography on a ( R, R)- Whelk- O1 column. The Absolute Con. guration ( AC) of 1 has been determined using vibrational circular dichroism ( VCD) spectroscopy. The VCD spectrum of 1 has been predicted using the Stephens equation for vibrational rotational strengths, implemented using density functional theory ( DFT) in the GAUSSIAN program. Using the B3PW91 functional and the 6- 311++ G ( 2d, 2p) basis set, the predicted VCD spectrum of S- 1 is in excellent agreement with the experimental VCD spectrum of (+)- 1, leading unambiguously to the AC S-(+). It is concluded that VCD is a useful technique for determining the ACs of chiral organometallic complexes, given the use of optimum functionals and basis sets. (c) 2007 Elsevier B. V. All rights reserved.