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Title: Cerium( iv ) complexes with guanidinate ligands: intense colors and anomalous electronic structures

Abstract

A series of cerium(IV) mixed-ligand guanidinate–amide complexes, {[(Me3Si)2NC(NiPr)2]xCeIV[N(SiMe3)2]3–x}+ (x = 0–3), was prepared by chemical oxidation of the corresponding cerium(III) complexes, where x = 1 and 2 represent novel complexes. The Ce(IV) complexes exhibited a range of intense colors, including red, black, cyan, and green. Notably, increasing the number of the guanidinate ligands from zero to three resulted in significant redshift of the absorption bands from 503 nm (2.48 eV) to 785 nm (1.58 eV) in THF. X-ray absorption near edge structure (XANES) spectra indicated increasing f occupancy (nf) with more guanidinate ligands, and revealed the multiconfigurational ground states for all Ce(IV) complexes. Cyclic voltammetry experiments demonstrated less stabilization of the Ce(IV) oxidation state with more guanidinate ligands. Moreover, the Ce(IV) tris(guanidinate) complex exhibited temperature independent paramagnetism (TIP) arising from the small energy gap between the ground- and excited states with considerable magnetic moments. Computational analysis suggested that the origin of the low energy absorption bands was a charge transfer between guanidinate π orbitals that were close in energy to the unoccupied Ce 4f orbitals. However, the incorporation of sterically hindered guanidinate ligands inhibited optimal overlaps between Ce 5d and ligand N 2p orbitals. As a result, there was anmore » overall decrease of ligand-to-metal donation and a less stabilized Ce(IV) oxidation state, while at the same time, more of the donated electron density ended up in the 4f shell. The results indicate that incorporating guanidinate ligands into Ce(IV) complexes gives rise to intense charge transfer bands and noteworthy electronic structures, providing insights into the stabilization of tetravalent lanthanide oxidation states.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [2];  [2];  [3]; ORCiD logo [4]; ORCiD logo [2]
  1. P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, USA, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  2. P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, USA
  3. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  4. Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Electricity (OE); National Science Foundation (NSF); University of Pennsylvania
OSTI Identifier:
1771359
Alternate Identifier(s):
OSTI ID: 1810788
Grant/Contract Number:  
AC02-05CH11231; SC0020169; AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Chemical Science
Additional Journal Information:
Journal Name: Chemical Science Journal Volume: 12 Journal Issue: 10; Journal ID: ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)
Country of Publication:
United Kingdom
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Qiao, Yusen, Yin, Haolin, Moreau, Liane M., Feng, Rulin, Higgins, Robert F., Manor, Brian C., Carroll, Patrick J., Booth, Corwin H., Autschbach, Jochen, and Schelter, Eric J. Cerium( iv ) complexes with guanidinate ligands: intense colors and anomalous electronic structures. United Kingdom: N. p., 2021. Web. doi:10.1039/D0SC05193D.
Qiao, Yusen, Yin, Haolin, Moreau, Liane M., Feng, Rulin, Higgins, Robert F., Manor, Brian C., Carroll, Patrick J., Booth, Corwin H., Autschbach, Jochen, & Schelter, Eric J. Cerium( iv ) complexes with guanidinate ligands: intense colors and anomalous electronic structures. United Kingdom. https://doi.org/10.1039/D0SC05193D
Qiao, Yusen, Yin, Haolin, Moreau, Liane M., Feng, Rulin, Higgins, Robert F., Manor, Brian C., Carroll, Patrick J., Booth, Corwin H., Autschbach, Jochen, and Schelter, Eric J. Thu . "Cerium( iv ) complexes with guanidinate ligands: intense colors and anomalous electronic structures". United Kingdom. https://doi.org/10.1039/D0SC05193D.
@article{osti_1771359,
title = {Cerium( iv ) complexes with guanidinate ligands: intense colors and anomalous electronic structures},
author = {Qiao, Yusen and Yin, Haolin and Moreau, Liane M. and Feng, Rulin and Higgins, Robert F. and Manor, Brian C. and Carroll, Patrick J. and Booth, Corwin H. and Autschbach, Jochen and Schelter, Eric J.},
abstractNote = {A series of cerium(IV) mixed-ligand guanidinate–amide complexes, {[(Me3Si)2NC(NiPr)2]xCeIV[N(SiMe3)2]3–x}+ (x = 0–3), was prepared by chemical oxidation of the corresponding cerium(III) complexes, where x = 1 and 2 represent novel complexes. The Ce(IV) complexes exhibited a range of intense colors, including red, black, cyan, and green. Notably, increasing the number of the guanidinate ligands from zero to three resulted in significant redshift of the absorption bands from 503 nm (2.48 eV) to 785 nm (1.58 eV) in THF. X-ray absorption near edge structure (XANES) spectra indicated increasing f occupancy (nf) with more guanidinate ligands, and revealed the multiconfigurational ground states for all Ce(IV) complexes. Cyclic voltammetry experiments demonstrated less stabilization of the Ce(IV) oxidation state with more guanidinate ligands. Moreover, the Ce(IV) tris(guanidinate) complex exhibited temperature independent paramagnetism (TIP) arising from the small energy gap between the ground- and excited states with considerable magnetic moments. Computational analysis suggested that the origin of the low energy absorption bands was a charge transfer between guanidinate π orbitals that were close in energy to the unoccupied Ce 4f orbitals. However, the incorporation of sterically hindered guanidinate ligands inhibited optimal overlaps between Ce 5d and ligand N 2p orbitals. As a result, there was an overall decrease of ligand-to-metal donation and a less stabilized Ce(IV) oxidation state, while at the same time, more of the donated electron density ended up in the 4f shell. The results indicate that incorporating guanidinate ligands into Ce(IV) complexes gives rise to intense charge transfer bands and noteworthy electronic structures, providing insights into the stabilization of tetravalent lanthanide oxidation states.},
doi = {10.1039/D0SC05193D},
journal = {Chemical Science},
number = 10,
volume = 12,
place = {United Kingdom},
year = {Thu Mar 18 00:00:00 EDT 2021},
month = {Thu Mar 18 00:00:00 EDT 2021}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1039/D0SC05193D

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