Related Experiment Video
Updated: Nov 28, 2025

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Exploring the Oxidation States of Neptunium with Schiff Base Coordination Complexes
Bonnie E Klamm1,2, Cory J Windorff1, Cristian Celis-Barros1
1Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Room 118 DLC, Tallahassee, Florida 32306, United States.
Abstract:
A pair of neptunium Schiff base coordination complexes, NpOL(MeOH) and NpL {HL = N,N'-bis[(4,4'-diethylamino)salicylidene]-1,2-phenylenediamine}, have been synthesized and analyzed by several characterization methods including single-crystal X-ray diffraction, electronic absorption, 1H NMR, cyclic voltammetry, and theoretical interpretation. Structural analysis reveals that NpOL(MeOH) and NpL are isomorphous with the previously reported UOL(MeOH) and ML (M = Pu, Ce, U, Th) complexes, respectively, allowing for a direct comparison across the series. The reduction of NpOL(MeOH) in situ or direct synthesis from a (NpVO2)+ source shows evidence of a pentavalent neptunyl (NpOL) species as determined by UV/vis/NIR and 1H NMR spectroscopy. The synthesis of (NpOL) directly from a (NpVO2)+ starting material gives a similar spectrum. Theoretical analysis offers insight into the electronic structure for a better understanding of the bonding patterns and relative stability of the different oxidation states. Computational results show that the Np-L covalent interactions in NpL are similar to those in the NpOL(MeOH) complex, indicating that neither the presence of the axial oxo ligands nor the oxidation state significantly modify the nature of the Np-L bonds.
More Related Videos
10:42Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Related Concept Videos
Coordination Compounds and Nomenclature
Coordination Number and Geometry
Valence Bond Theory
Properties of Transition Metals
Complexation Equilibria: Overview
The equilibrium constant of the complexation reaction is represented as the formation constant...
Metal-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...