Aerobic Oxidation of Carbon Monoxide in a Tetrametallic Complex

Abstract

Seminaked extended metal‐atom chains (EMACs) are suitable for the aerobic oxidation of CO to CO2. One molecule of carbon dioxide remains attached to the metallic chain as a doubly deprotonated formate group (see figure), whereas the other is released. The reaction involves the activation and cleavage of a molecule of dioxygen with transfer of the atoms to two CO ligands.

Paramagnetic One-Dimensional Chain Complex Consisting of Three Kinds of Metallic Species Showing Magnetic Interaction through Metal–Metal Bonds

“…The study of heterometallic complexes continually leads researchers toward new compound creation by the combination of metallic species to afford diverse structural, electronic, magnetic properties, and catalytic activity. − Among these new compounds, heteronuclear metal string complexes (HMSCs), where two or three metals are regularly aligned as several strings with metal–metal bonds, have been the focus of attention due to their potential applications, which are not found in extended metal atom chains comprised of homometals. , For example, an asymmetric pentanuclear complex aligned as Ni–Ru–Ru–Ni–Ni shows a negative differential resistance expecting a molecular rectifier, and a heterotrimetallic complex aligned as Mo–Mo–Ni shows an extraordinarily large ferromagnetic coupling thorough metal–metal bonds, which are attributed to abnormal electronic structures induced by connecting multiple metals. Several HMSCs, − as well as pioneered heterometallic complexes, − have been reported. Rational and systematic synthesis methods are currently being explored and sequential synthesis methods for trinuclear complexes are suggested …”

Structure and redox behaviour of a paramagnetic Rh–Pt–Cu–Pt–Rh heterometallic-extended metal-atom chain

“…10–13 These materials exhibit unique physical properties, 14–16 which depend on the composition of the metal-atom backbone. 16–37 For example, the unpaired electrons at the ends of an asymmetric Mo–Mo–Ni EMAC interact ferromagnetically, 29 producing rectifying effects in single-molecule conduction. 20,24 Such molecules are typically synthesised by a template method employing multidentate ligands such as origo-pyridyl amines.…”