Sandwich compounds of cyanotrispyrazolylborates: complexation-induced ligand isomerization.
Reaction of the new cyanoscorpionate ligand, hydrotris(4-cyano-3-phenyl)pyrazolylborate (Tp(Ph),(4CN)) with Co(II), Mn(II), and Fe(II) unexpectedly results in the isolation only of crystals containing sandwich complexes in which the ligands have been isomerized to produce the heterocyanoscorpionate hydrobis(4-cyano-3-phenylpyrazolyl)(4-cyano-5-phenylpyrazolyl)borate (Tp(Ph),(4CN*)). The three complexes have been characterized crystallographically and are isostructural, with each ligand acting in a tridentate manner toward the metal. The isomerization of the ligand appears to be more facile than that of the analogous non-cyano ligand, Tp(Ph), with which crystals of the unisomerized sandwich compound have been isolated for Mn(II) and Fe(II).
Zhao
Ningfeng
N
Department of Chemistry, Wichita State University, Wichita, Kansas 67260, USA.
Van Stipdonk
Michael J
MJ
Bauer
Cary
C
Campana
Charles
C
Eichhorn
David M
DM