M(CO)4 (M = Mo or W) complexes of 2,6-bis(methylthiomethyl)pyridine (L1) and 2,6-bis(p-tolylthiomethyl)pyridine (L2): a dynamic NMR study

Author(s): Abel Edward W. | Blackwall Elizabeth S. | Creber Michel L. | Heard Peter J. | Orrell Keith G.

Type of publication: Journal paper

Abstract: The hybrid S/N/S donor ligands 2,6-bis(methylthiomethyl)pyridine (L1) and 2,6-bis(p-tolylthiomethyl)pyridine (L2) react with the [M(CO)5(THF)] (M = Mo or W) compounds to form complexes of general formula [M(CO)4L] (M = Mo, L = L2; M = W, L = L1 or L2), where both L1 and L2 act in a S/N bidentate chelate fashion. In solution, these complexes undergo three fluxional processes, viz. inversion at the coordinated S atom, S1-S2 switching, and combined inversion and S1-S2 switching, leading to an interconversion of the four possible permutational isomers. Energy barriers for all three processes have been evaluated by standard one-dimensional band-shape analysis techniques. The mechanism of the S1-S2 switch is discussed.

Date Published: July 7 1994

Publication title: Journal of Organometallic Chemistry

Publisher: Elsevier

Place of publication: Devon

Pages: 83-88

Subject(s): Chemistry | Organometallic Chemistry

DOI: https://doi.org/10.1016/0022-328X(94)05192-E

Keywords: Molybdenum | Tungsten | Fluxionality | Nuclear magnetic resonance

Depositing User: Hasnah Patel