Sterically Hindered Poly(pyrazolyl)borates κ2 N, N Coordination to form a New Family of Homoleptic Four-Coordinate Iron Complexes

Authors

• Dana E. Hicks, Macalester CollegeFollow

Document Type

Honors Project On-Campus Access Only

Abstract

In this work, sterically hindered poly(pyrazolyl)borates are shown to adopt an unexpected κ²-N,N coordination mode, yielding three novel 14-electron homoleptic four-coordinate iron complexes of the general formula Fe[RR’Bpz*₂]₂. Simultaneous functionalization of substituents on the pyrazole rings and non-pyrazole R-groups enforces the high-spin (S=2) state and the rare pseudo-tetrahedral bidentate coordination mode adopted by the supporting ligand structure in the resultant complexes. Investigation of the structural and electronic composition of this new family of iron-based complexes, via paramagnetic ¹H NMR spectral analysis and numerical coordination-geometry classification, reveals significant metal-ligand spin interactions and structural characteristics that further define the systems.

Recommended Citation

Hicks, Dana E., "Sterically Hindered Poly(pyrazolyl)borates κ2 N, N Coordination to form a New Family of Homoleptic Four-Coordinate Iron Complexes" (2026). Chemistry Honors Projects. 46.
https://digitalcommons.macalester.edu/chem_honors/46