Increasing Ligand Denticity and Stability for a Water Oxidation Electrocatalyst using P(V) as Connecting Element

Saeedifard, Farzaneh; Breyer, Colton J.; Chi Cao, Thomas; Kamdar, Jayneil M.; Kerkhof, Jake; Smith, Diane K.; Cooksy, Andrew L.; Rheingold, Arnold L.; Moore, Curtis E.; Gu, Jing; Grotjahn, Douglas B.

doi:10.1002/cctc.202301644

Title: Increasing Ligand Denticity and Stability for a Water Oxidation Electrocatalyst using P(V) as Connecting Element

Journal Article · 27 March 2024 · ChemCatChem

DOI: https://doi.org/10.1002/cctc.202301644 · OSTI ID:2329542

Saeedifard, Farzaneh ^[1];

^[1]; Chi Cao, Thomas ^[1]; Kamdar, Jayneil M. ^[1]; Kerkhof, Jake ^[1]; Smith, Diane K. ^[1]; Cooksy, Andrew L. ^[1]; Rheingold, Arnold L. ^[2]; Moore, Curtis E. ^[2];

^[1]; Grotjahn, Douglas B. ^[1]

Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182-1030
Department of Chemistry and Biochemistry University of California San Diego 9500 Gilman Drive, La Jolla CA 92093

Abstract Carboxylate complexes have risen to prominence in the field of water oxidation catalysis. Here for the first time we use the higher valence of phosphinates [P(V)] relative to that of carboxylates [C(IV)] to increase ligand denticity. We describe the synthesis and characterization of a new dianionic pentadentate ligand, bcpq ²⁻ that contains a tridentate 2,2’‐bipyridine‐6‐carboxylato moiety, in addition to a 6’‐phosphinato substituent that acts as fourth ligand and bears a side arm containing a quinoline, the fifth ligand. The new bcpq ligand allows formation of [Ru(II)(bcpq)(L)] ( 2 a – b , L=picoline or isoquinoline) and in preliminary results, of a Co(II) complex. NMR spectroscopy, X‐ray diffraction, cyclic voltammetry, differential pulse and square wave voltammetry were used to characterize 2 a – b , with 2 b being characterized more extensively as a catalyst. Bulk electrolysis over 15 h at pH 7 was also used, showing that 2 b gave 100±5 % faradaic efficiency and remained completely homogeneous, whereas 1 b was no longer homogeneous; this comparison conclusively shows the advantage of the added denticity in the electrocatalytic context. Replacing carboxylate with P(V) phosphinate with an added arm may be used in other ligand systems to enhance the durability of homogeneous catalysts.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0018310

OSTI ID:: 2329542

Alternate ID(s):: OSTI ID: 2341650

Journal Information:: ChemCatChem, Journal Name: ChemCatChem Journal Issue: 12 Vol. 16; ISSN 1867-3880

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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