Utilising a Proton‐Responsive 1,8‐Naphthyridine Ligand for the Synthesis of Bimetallic Palladium and Platinum Complexes

Author:

Multem Arie J. H.1ORCID,Delaney Andie R.1ORCID,Kroeger Asja A.12ORCID,Coote Michelle L.2ORCID,Colebatch Annie L.1ORCID

Affiliation:

1. Research School of Chemistry Australian National University Canberra ACT 2601 Australia

2. Institute for Nanoscale Science & Technology Flinders University Adelaide South Australia 5042 Australia

Abstract

AbstractWe 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.

Funder

Australian Research Council

Westpac Scholars Trust

Publisher

Wiley

Subject

General Chemistry,Biochemistry,Organic Chemistry

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