Synthesis and structure of [BpBut,Pri]2Co: a bis(pyrazolyl)hydroborato cobalt(II) complex with trans [Co · · · H–B] interactions

Abstract

The bis{bis(3-tert-butyl-5-isopropylpyrazolyl)hydroborato}cobalt(II) complex [Bp^But,Pri]₂Co has been synthesized by reaction of Tl[Bp^But,Pri] with Co(ClO₄)₂·6H₂O; the molecular structure of [Bp^But,Pri]₂Co is based on a square planar array of pyrazolyl groups with two axial [Co · · · H–B] interactions, in marked contrast to those of other [Bp^R,R′]₂Co derivatives which have tetrahedral structures and are devoid of such interactions.