Farrell, P. A., Hartl, F., Zalis, S., Mahabiersing, T., & jr. Vlcek, A. (2000). The spectroscopic, electrochemical and photophysical effects of the b1/a2 pi* lowest unoccupied molecular orbital switching in [M(CO)4(N,N)]; M = Cr, W; N,N = 1,10-phenanthroline or 3,4,7,8-tetramethyl-1,10-phenanthroline. An experimental and DFT computational study. Dalton : an international journal of inorganic chemistry, 4323-4331.