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Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes

[Image: see text] The first actinide complexes of the pyridine dipyrrolide (PDP) ligand class, ((Mes)PDP(Ph))UO(2)(THF) and ((Cl2Ph)PDP(Ph))UO(2)(THF), are reported as the U(VI) uranyl adducts of the bulky aryl substituted pincers ((Mes)PDP(Ph))(2–) and ((Cl2Ph)PDP(Ph))(2–) (derived from 2,6-bis(5-(...

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Autores principales: Hakey, Brett M., Leary, Dylan C., Lopez, Lauren M., Valerio, Leyla R., Brennessel, William W., Milsmann, Carsten, Matson, Ellen M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044449/
https://www.ncbi.nlm.nih.gov/pubmed/35420825
http://dx.doi.org/10.1021/acs.inorgchem.2c00348
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author Hakey, Brett M.
Leary, Dylan C.
Lopez, Lauren M.
Valerio, Leyla R.
Brennessel, William W.
Milsmann, Carsten
Matson, Ellen M.
author_facet Hakey, Brett M.
Leary, Dylan C.
Lopez, Lauren M.
Valerio, Leyla R.
Brennessel, William W.
Milsmann, Carsten
Matson, Ellen M.
author_sort Hakey, Brett M.
collection PubMed
description [Image: see text] The first actinide complexes of the pyridine dipyrrolide (PDP) ligand class, ((Mes)PDP(Ph))UO(2)(THF) and ((Cl2Ph)PDP(Ph))UO(2)(THF), are reported as the U(VI) uranyl adducts of the bulky aryl substituted pincers ((Mes)PDP(Ph))(2–) and ((Cl2Ph)PDP(Ph))(2–) (derived from 2,6-bis(5-(2,4,6-trimethylphenyl)-3-phenyl-1H-pyrrol-2-yl)pyridine (H(2)(Mes)PDP(Ph), Mes = 2,4,6-trimethylphenyl), and 2,6-bis(5-(2,6-dichlorophenyl)-3-phenyl-1H-pyrrol-2-yl)pyridine (H(2)(Cl2Ph)PDP(Ph), Cl(2)Ph = 2,6-dichlorophenyl), respectively). Following the in situ deprotonation of the proligand with lithium hexamethyldisilazide to generate the corresponding dilithium salts (e.g., Li(2)(Ar)PDP(Ph), Ar = Mes of Cl(2)Ph), salt metathesis with [UO(2)Cl(2)(THF)(2)](2) afforded both compounds in moderate yields. The characterization of each species has been undertaken by a combination of solid- and solution-state methods, including combustion analysis, infrared, electronic absorption, and NMR spectroscopies. In both complexes, single-crystal X-ray diffraction has revealed a distorted octahedral geometry in the solid state, enforced by the bite angle of the rigid meridional ((Ar)PDP(Ph))(2–) pincer ligand. The electrochemical analysis of both compounds by cyclic voltammetry in tetrahydrofuran (THF) reveals rich redox profiles, including events assigned as U(VI)/U(V) redox couples. A time-dependent density functional theory study has been performed on ((Mes)PDP(Ph))UO(2)(THF) and provides insight into the nature of the transitions that comprise its electronic absorption spectrum.
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spelling pubmed-90444492022-04-27 Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes Hakey, Brett M. Leary, Dylan C. Lopez, Lauren M. Valerio, Leyla R. Brennessel, William W. Milsmann, Carsten Matson, Ellen M. Inorg Chem [Image: see text] The first actinide complexes of the pyridine dipyrrolide (PDP) ligand class, ((Mes)PDP(Ph))UO(2)(THF) and ((Cl2Ph)PDP(Ph))UO(2)(THF), are reported as the U(VI) uranyl adducts of the bulky aryl substituted pincers ((Mes)PDP(Ph))(2–) and ((Cl2Ph)PDP(Ph))(2–) (derived from 2,6-bis(5-(2,4,6-trimethylphenyl)-3-phenyl-1H-pyrrol-2-yl)pyridine (H(2)(Mes)PDP(Ph), Mes = 2,4,6-trimethylphenyl), and 2,6-bis(5-(2,6-dichlorophenyl)-3-phenyl-1H-pyrrol-2-yl)pyridine (H(2)(Cl2Ph)PDP(Ph), Cl(2)Ph = 2,6-dichlorophenyl), respectively). Following the in situ deprotonation of the proligand with lithium hexamethyldisilazide to generate the corresponding dilithium salts (e.g., Li(2)(Ar)PDP(Ph), Ar = Mes of Cl(2)Ph), salt metathesis with [UO(2)Cl(2)(THF)(2)](2) afforded both compounds in moderate yields. The characterization of each species has been undertaken by a combination of solid- and solution-state methods, including combustion analysis, infrared, electronic absorption, and NMR spectroscopies. In both complexes, single-crystal X-ray diffraction has revealed a distorted octahedral geometry in the solid state, enforced by the bite angle of the rigid meridional ((Ar)PDP(Ph))(2–) pincer ligand. The electrochemical analysis of both compounds by cyclic voltammetry in tetrahydrofuran (THF) reveals rich redox profiles, including events assigned as U(VI)/U(V) redox couples. A time-dependent density functional theory study has been performed on ((Mes)PDP(Ph))UO(2)(THF) and provides insight into the nature of the transitions that comprise its electronic absorption spectrum. American Chemical Society 2022-04-14 2022-04-25 /pmc/articles/PMC9044449/ /pubmed/35420825 http://dx.doi.org/10.1021/acs.inorgchem.2c00348 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Hakey, Brett M.
Leary, Dylan C.
Lopez, Lauren M.
Valerio, Leyla R.
Brennessel, William W.
Milsmann, Carsten
Matson, Ellen M.
Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title_full Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title_fullStr Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title_full_unstemmed Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title_short Synthesis and Characterization of Pyridine Dipyrrolide Uranyl Complexes
title_sort synthesis and characterization of pyridine dipyrrolide uranyl complexes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044449/
https://www.ncbi.nlm.nih.gov/pubmed/35420825
http://dx.doi.org/10.1021/acs.inorgchem.2c00348
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