Sandwiched sodium and half-sandwiched copper carbonyl complexes featuring polyfluorinated tris(triazolyl)borate [HB(3,5-(CF3)2Tz)3]−

Fluorinated tris(triazolyl)borate [HB(3,5-(CF3)2Tz)3]− (Tz = triazolyl) affords the isolation of [Na(THF)6]{[HB(3,5-(CF3)2Tz)3]2Na} with a ligand sandwiched sodium ion and a copper carbonyl complex [HB(3,5-(CF3)2Tz)3]CuCO with a high C–O stretching frequency.