Abstract
The reaction of Os3(CO)12 with 1.2 eq. of pyrazole (3,5-(CF3)2-pz)H at 190 °C affords triosmium complex Os3(CO)10(3,5-(CF3)2-pz)(μ-H)
(1) as the isolable product. Upon further treatment with excess pyrazole (3,5-(CF3)2-pz)H under more forcing conditions, complex 1 converts to a diosmium pyrazolate complex [Os(CO)3(3,5-(CF3)2-pz)]2
(2) in high yield. These osmium complexes are characterized by spectroscopic methods and single crystal X-ray diffraction study, showing the expected triangular and linear Os–Os backbone and with one and two bridging