Related Experiment Video
Updated: Jun 28, 2026
Modeling Ligands into Maps Derived from Electron Cryomicroscopy
Published on: July 19, 2024
Computational density functional study of polypyrrolic macrocycles: analysis of actinyl-oxo to 3d transition metal
Joel J Berard1, Georg Schreckenbach, Polly L Arnold
1Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
Abstract:
Density functional theoretical methods are used to study heterobimetallic compounds of a new form of binucleating Schiff-base polypyrrolic macrocycle, denoted [An(VI)O(2)(1)H(2)L], [An(V)O(2)(1)H(2)L](-), [An(VI)O(2)(TM)L] and [An(V)O(2)(TM)L](-), and containing actinyl ions AnO(2)(n+) (An = U, Np, Pu; n = 1, 2) and 3d transition metals (TM): no TM = 1, Mn = 2, Fe = 3, Co = 4, and Zn = 5. Calculated bond orders (TM-O2 = 0.36 to 0.81) provide evidence for partial bond formation between the transition metal (TM) and the actinyl-endo-oxygen for all 24 cases studied. Redox potentials for [An(VI)O(2)(1)H(2)L]/[An(V)O(2)(1)H(2)L](-) couples were found to have the same Np(VI/V) > Pu(VI/V) > U(VI/V) trend as previously studied for the [AnO(2)(H(2)O)(5)](2+/1+) couples, where Np(VI) is the most easily reduced to Np(V). Extrapolation from the earlier penta-aqua actinyl results is used to predict [An(VI)O(2)(1)H(2)L]/[An(V)O(2)(1)H(2)L](-) redox couples of U = -1.10 eV, Np = 0.25 eV, and Pu = 0.01 eV. The calculated redox potential for [U(VI)O(2)(1)H(2)L]/[U(V)O(2)(1)H(2)L](-) is within 0.08 eV of the value found by cyclic voltammetry (-1.18 eV, in THF/NBu(n)(4)BF(4) solvent).
More Related Videos
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
06:18Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
Published on: April 24, 2018
Related Concept Videos
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:42Valence Bond Theory
01:18Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group with both...
02:40MO Theory and Covalent Bonding
02:51Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...