Synthesis and Structures of Co Bis-Trifluoromethylpyrazolate Complexes

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Date

2013-04

Authors

Rivers, Joseph H.
Jones, Richard A.

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Abstract

Reactions of Co(PMe3)(3)Cl or CoCl2 with 3,5-(CF3)(2)-PzNa in hexane give Co(PMe3)(3)(3,5-(CF3)(2)-Pz) (1) and Co(PMe3)(3)(3,5-(CF3)(2)-Pz)(2) (2) respectively (3,5-(CF3)(2)-PzNa = sodium bis-trifluoromethylpyrazolate). Reaction of (3,5-(CF3)(2)-PzH) with Co(PMe3)(4) produces the unusual complex [cis-Co(PMe3)(4)H-2][Co(PMe3)(3,5-( CF3)(2)-Pz)(3)] (3) which formally contains a Co(III)Co(II) complex ion pair. Reaction of 3,5-(CF3)(2)-PzLi with an oxygenated suspension of CoCl2 and 3 equivalents of PMe3 gives (3,5-(CF3)(2)-Pz)(2)Co(mu-3,5-(CF3)(2)Pz)(mu-OPMe3)Li(OPMe3)(2) (4), while 2 reacts with LiOH to give (PMe3)Co(mu-3,5-(CF3)(2)-Pz)(2)(mu(3)-OH)Li (5). Both 2 and 3 react with O-2 in toluene solution to give Co(OPMe3)(2)(3,5-(CF3)(2)-Pz)(2) (6). All compounds have been characterized spectroscopically and by single crystal X-ray diffraction studies.

Department

Chemistry

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Keywords

chemical-vapor-deposition, dichlorobis(trimethylphosphine, oxide)cobalt(ii), cobalt silicide, cvd precursors, thin-films, coordination, phosphorus, ligands, pyrazolate, chemistry, inorganic & nuclear

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Citation

Rivers, Joseph H., and Richard A. Jones. "Synthesis and structures of Co bis-trifluoromethylpyrazolate complexes." Dalton Transactions 42, no. 36 (Apr.,2013): 12898-12907.

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http://hdl.handle.net/2152/41025

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