Multielectron Redox Chemistry of Transition Metal Complexes Supported by a Non-Innocent N3P2 Ligand: Synthesis, Characterization, and Catalytic Properties

Wang, Denan; Ekanayake, Danushka M.; Lindeman, Sergey V.; Verani, Cláudio N.; Fiedler, Adam T.

doi:10.1002/ejic.201800843

Title: Multielectron Redox Chemistry of Transition Metal Complexes Supported by a Non-Innocent N₃P₂ Ligand: Synthesis, Characterization, and Catalytic Properties

Journal Article · Tue Sep 25 00:00:00 EDT 2018 · European Journal of Inorganic Chemistry

DOI:https://doi.org/10.1002/ejic.201800843· OSTI ID:1610585

Wang, Denan ^[1]; Ekanayake, Danushka M. ^[2]; Lindeman, Sergey V. ^[1];

^[2];

^[1]

Marquette Univ., Milwaukee, WI (United States)
Wayne State Univ., Detroit, MI (United States)

A new redox‐active, diarylamido‐based ligand ( L ^N3P2 ) capable of κ ⁵ ‐ N , N , N,P,P chelation has been used to prepare a series of complexes with the general formula [M ^II ( L ^N3P2 )]X, where M = Fe ( 1 ; X = OTf), Co ( 2 ; X = ClO ₄ ), or Ni ( 3 ; X = ClO ₄ ). The diarylamido core of monoanionic L ^N3P2 is derived from bis(2‐amino‐4‐methylphenyl)amine, which undergoes condensation with two equivalents of 2‐(diphenylphosphanyl)benzaldehyde to provide chelating arms with both arylphosphine and imine donors. X‐ray structural, magnetic, and spectroscopic studies indicate that the N ₃ P ₂ coordination environment generally promotes low‐spin configurations. Three quasi‐reversible redox couples between +1.0 and –1.5 V (vs. Fc ⁺ /Fc) were observed in voltammetric studies of each complex, corresponding to M ^II /M ^III oxidation, L ^N3P2 ‐based oxidation, and M ^II /M ^I reduction (in order of highest to lowest potential). Spectroscopic and computational analyses of 3 ^ox – generated via chemical one‐electron oxidation of 3 – revealed that a stable diarylaminyl radical ( L ^N3P2· ) is formed upon oxidation. The ability of the Co ^II complex ( 2 ) to function as an electrocatalyst for H ₂ generation was evaluated in the presence of weak acids. Moderate activity was observed using 4‐ tert ‐butylphenol as the proton source at potentials below –2.0 V. The insights gained here will assist in the future design of pentadentate mixed N/P‐based chelates for catalytic processes.

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Research Organization:: Wayne State Univ., Detroit, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001907

OSTI ID:: 1610585

Alternate ID(s):: OSTI ID: 1473739

Journal Information:: European Journal of Inorganic Chemistry, Vol. 2018, Issue 37; ISSN 1434-1948

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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Title: Multielectron Redox Chemistry of Transition Metal Complexes Supported by a Non-Innocent N₃P₂ Ligand: Synthesis, Characterization, and Catalytic Properties