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- W2034302837 abstract "Abstract The complexes, [Co(CNC 4 H 9 - n ) 4 (SbPh 3 ) 2 ](ClO 4 ) 2 , [Co(CNC 6 H 11 ) 4 (SbPh 3 ) 2 ](ClO 4 ) 2 , [Co(CNC 6 H 11 ) 4 (OSbPh 3 ) 2 ](ClO 4 ) 3 , and [Co(CNCH 2 Ph) 4 (OSbPh 3 ) 2 ](BF 4 ) 3 , have been synthesized by reaction of excess SbPh 3 with the Co(II)–alkylisocyanide salts. With CNC 6 H 11 , the Co(II) complex can be isolated, continued reaction in solution producing the Co(IIl) complex. With CNCH 2 Ph, reaction proceeds more rapidly through a Co(II) complex directly to the Co(III) complex isolated. With CNC 4 H 9 - n , only the Co(II) complex is observed; attempted further reaction causes decomposition to OSbPh 3 . Characterization of the complexes is primarily in the solid state due to limited stability in solution. Coordination stereochemistries for both Co(II) and Co(III) complexes appear to be trans -substituted octahedral. Magnetic moments for [Co(CNC 4 H 9 - n ) 4 (SbPh 3 ) 2 ](ClO 4 ) 2 and [Co(CNC 6 H 11 ) 4 (SbPh 3 ) 2 ](ClO 4 ) 2 are low-spin ( μ eff =1.94 BM, 2.27 BM, respectively), as expected, while [Co(CNCH 2 Ph) 4 (OSbPh 3 ) 2 ](BF 4 ) 3 and [Co(CNC 6 H 11 ) 4 (OSbPh 3 ) 2 ](C1O 4 ) 3 are intermediate-spin ( μ eff =3.30, 3.70 BM, respectively), as expected. Six-coordinate Co(III) complexes, in which both Co(II) and SbPh 3 have been oxidized in the reaction, appear to be favored over the six-coordinate Co(II) complexes. Reactions of SbPh 3 with pentakis (alkylisocyanide)cobalt(II) complexes are thus drastically different from reactions with PPh 3 and even AsPh 3 ." @default.
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- W2034302837 date "2002-05-01" @default.
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- W2034302837 title "Synthesis of tetrakis(alkylisocyanide)bis(triphenylstibine)cobalt(II) and tetrakis(alkylisocyanide)bis(triphenylstibine oxide)cobalt(III) complexes: ligand substitution and oxidation in pentakis(alkylisocyanide)cobalt(II)" @default.
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- W2034302837 doi "https://doi.org/10.1016/s0020-1693(02)00858-7" @default.
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