We show in this work how lithium tellurolate, Li(X)nTeCH2SiMe3 (X = THF (n =1; 1); 12-crown-4 (n =2; 2)), can serve as an effective Te-atom transfer reagent to all group 5 transition metal halide precursors irrespective of their oxidation state. Mononuclear and bis(telluride) complexes of these elements, namely (PNP)M(Te)2 (M = V; Nb, 3; Ta, 4; PNP− = N[2-PiPr2-4-methylphenyl]2), are reported herein including structural and complete spectroscopic data. Whereas complex (PNP)V(Te)2 can be readily prepared from the trivalent precursor (PNP)VCl2, two equiv of tellurolate and elemental Te partially solubilized with PMe3, complex 3 can also be similarly obtained using the same ingredient but with or without the reductant, Na/NaCl. Complex 4 is formed from the addition of four equiv of tellurolate to (PNP)TaF4. Having access to a triad of (PNP)M(Te)2 systems for group 5 metals has allowed us to compare them using a combination of theory and spectroscopy.

Tellurolate as an effective Te-atom transfer reagent to assemble the triad of group 5 metal bis(tellurides)

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