Abstract
We present four proton-responsive palladium and platinum complexes, [MCl2(RPONNHO)] (M=Pd, Pt; R=iPr, tBu) synthesised by complexation of PdCl2 or PtCl2(COD) with the 1,8-naphthyridine ligand RPONNHO. Deprotonation of [MCl2(tBuPONNHO)] switches ligand coordination from mono- to dinucleating, offering a synthetic pathway to bimetallic PdII and PtII complexes [M2Cl2(tBuPONNO)2]. Two-electron reduction gives planar MI−MI complexes [M2(tBuPONNO)2] (M=Pd, Pt) containing a metal-metal bond. In contrast to the related nickel system that forms a metallophosphorane [Ni2(tBuPONNOPONNO)], an unusual phosphinite binding mode is observed in [M2(tBuPONNO)2] containing close phosphinite-naphthyridinone P⋅⋅⋅O interactions, which is investigated spectroscopically, crystallographically and computationally. The presented proton-responsive and structurally-responsive RPONNHO and bimetallic RPONNO complexes offer a novel platform for future explorations of metal-ligand and metal-metal cooperativity with palladium and platinum.
Original language | English |
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Article number | e202301071 |
Number of pages | 13 |
Journal | Chemistry - An Asian Journal |
Volume | 19 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Feb 2024 |