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The inertness of eight-coordinate tetrakis(picolinato)tungsten(IV) complex has been investigated by spectroscopic method in nonpolar solvent at 60℃, 75℃, 90℃, 120℃, and reflux condition. Until 2 days, showed the inertness whether existance of oxygen or not. After 2 days, showed the oxidation of W(Ⅳ) complex much more rapidly than substitution, which had kobs(sec-1) ∝ 1/[ligand]2. On sealing the sample under Ar gas, showed the inertness until 50 days, which had kobs(sec-1) = 8.8× 10-7. The 1H-NMR peak of H6 in complex was diminished, otherwise that of free ligand was grown up. This result indicated that this complex was very inert.
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