Abstract
A new unsymmetrical dinucleating phosphino pyridyl 1,8-naphthyridine ligand PNNN is reported. Reaction with CuCl gave the dicopper complex [Cu2(μ-Cl)2(PNNN)] (1). In contrast, complexation of [RuCl2(cymene)]2 yielded a monometallic species [RuCl(cymene)(PNNN)]Cl ([2]Cl) in which the Ru is bound to the κ2-N,N, rather than κ2-P,N, binding pocket. The selective formation of the monoruthenium complex [2]Cl enabled synthesis of heterobimetallic complexes [RuCuCl3(cymene)(PNNN)] (3) and [RuCuCl2(cymene)(PNNN)]2[PF6]2 ([4]2[PF6]2), which both exhibit κ1-P coordination of Cu. Complexes 1 and [4]2[PF6]2 exhibit reversible dearomatisation-aromatisation behaviour at the metal-ligand cooperative methylene site upon sequential treatment with base (KOtBu) and acid (HCl). Notably, deprotonation of [4]2[PF6]2 induces a shift in the coordination mode of Cu to κ2-P,N.
Original language | English |
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Journal | Dalton Transactions |
DOIs | |
Publication status | Accepted/In press - 2024 |