title: F-element metalated dipyrrins: synthesis and characterization of a family of uranyl bis(dipyrrinate) complexes.
abstract: Using an improved, chromatography-free dipyrrin synthesis, the α,β-unsubstituted dipyrrins [RC(C4H2N)2H] (2) (R = tolyl (2tolyl), p-OMe-C6H4(2anis), mesityl (2mes), ferrocenyl (2Fc)) were isolated in good to excellent yields. Deprotonation of 2 with Na[N(SiMe3)2] gives the alkali metal salts [Na(DME)n][RC(C4H2N)2] (3) which reacts with UO2Cl2(THF)3to give the uranyl bis(dipyrrinates) UO2[RC(C4H2N)2]2(L) (L = THF (4R-THF); DMAP (4R-DMAP)) (R = tolyl, p-OMe-C6H4, mesityl, ferrocenyl). The THF adducts, 4R-THF, are unstable in aromatic and nonpolar solvents and rapidly decompose to 2 and an intractable uranium-containing solid. On the other hand, the DMAP adducts, 4R-DMAP, are indefinitely stable in solution. The solid-state structures of 4R-THF and 4R-DMAP reveal distorted trigonal bipyramidal geometries. In the solid-state, the dipyrrinate ligands exhibit significant distortions including bowing and, in some instances, out-of-plane equatorial N-atom coordination, likely as a consequence of steric crowding and interligand repulsion. The complexes, 4R-DMAP, have been fully characterized by NMR, UV/Vis, and fluorescence spectroscopies, and their electrochemical properties have been investigated through cyclic voltammetry. The cyclic voltammograms of 4R-DMAP display several redox features but present a reversible wave at ca. -1.9 V (vs. Fc0/+) attributable to a ligand centred reduction. Fluorescence measurements of all compounds reveal that only the mesityl derivatives 2mes, 3mes, and 4mes fluoresce with modest Stokes shift that ranges from ca. 30-70 nm, with 4mes displaying the greatest relative emission intensity.
authors.affiliation: Department of Chemistry, University of Texas at El Paso, El Paso, Texas 79968, USA. asfortier@utep.edu.
authors.forename: Duer
authors.initials: D
authors.lastname: Bolotaulo
authors.affiliation: Department of Chemistry, University of Texas at El Paso, El Paso, Texas 79968, USA. asfortier@utep.edu.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Metta-Magaña
authors.affiliation: Department of Chemistry, University of Texas at El Paso, El Paso, Texas 79968, USA. asfortier@utep.edu.
authors.forename: Skye
authors.identifier: http://orcid.org/0000-0002-0502-5229
authors.initials: S
authors.lastname: Fortier