CHIROPTICAL PROPERTIES OF A COMPOUND CONTAINING A METAL METAL QUADRUPLE BOND - SYNTHESIS, STRUCTURE, AND SPECTRA OF BETA-MO2CL4(S,S-BPPM)2, WHERE S,S-BPPM IS (2S,4S)-N-(TERT-BUTOXYCARBONYL)-4-(DIPHENYLPHOSPHINO)-2-[(DIPHENYLPHOSPHINO)-METHYL]PYRROLIDINE

The complex, μ-Mo2Cl4(S, S-bppm)2 is prepared by reaction of K4Mo2Cl8 with (2S, 4S)-tert-butyl 4-(diphenylphosphino)-2-[(diphenylphosphino)methyl]-1-pyrrolidinecarboxylate (S, S-bppm). Its UV-vis, CD, IR, and NMR spectra have been recorded, and its structure has been determined. Crystal data: space group P212121, a = 19.812 (4) Å, b = 20.609 (2) Å, c = 17.815 (3) Å, V = 7273 (2) Å3, Z = 4, with final residuals R = 0.0698 and Rw = 0.0852. This complex has a average twist angle of about 0°. The circular dichroism spectrum of this complex shows two prominent bands at 580 and 492 nm which can be assigned to [formula omitted] transitions, respectively. The one-electron, static coupling mechanism is used to account for the observation of the circular dichroism bands. © 1990, American Chemical Society. All rights reserved.