Add time:08/22/2019         Source:sciencedirect.com

The vanadium(II) halides [VCl2(H2O)4] and [V(H2O)6]Br2, prepared from the metal and the appropriate acid, combine with 1,2-bis(dimethylphosphino)ethane (dmpe) and 1,2-bis(diethylphosphino)ethane (depe) in methanol to give [VX2(dmpe)2] and [VX2(depe)2] (XCl or Br). The iodo complexes were obtained from [V(MeOH)6]I2, although [VI2(depe)2] was not pure. The complexes [VX2(dppe)2]·2thf (XCl or Br; dppe=1,2- bis(diphenylphosphino)ethane) could not be isolated from methanol, but were obtained from tetrahydrofuran (thf). All are typical vanadium(II) complexes, and [VCl2(depe)2] and [VCl2(dppe)2]·2thf have trans structures. The VCl bond distances, 2.445(2) and 2.420(1) Å, respectively, are similar to that in the known complex [VCl2(dmpe)2], but the VP bond distances are longer by approximately 0.06 Å and the PVP angles are smaller by c. 3°, possibly due to the steric crowding of the more heavily substituted depe and dppe ligands in the equatorial plane. Some new complexes [VX3(PR3)n] (XCl or Br, PR3=monotertiary phosphine, n=2 or 3) were also prepared from [VX3(thf)3].

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