Metal isonitrosyl

Organolanthanide complexes are coordinately unsaturated and as a result take part in forming mixed complexes with transition metal complexes containing nitrosyl or carbonyl groups. As a result, mixed complexes containing metal-metal bonds or lanthanide-isocarbonyl or isonitrosyl interactions have been characterized. Some typical complexes are given below. 

Isocarbonyl and isonitrosyl linkages to lanthanides are evident in the complexes noted above [256], confirmed by IR spectroscopy. In the Yb complex, an isocarbonyl bridge Yb-OC-Co has been confirmed while in the Iutetium complex Lu-Ru metal-metal bond is present [257]. 

Bonding of NO to transition metals usually occurs via the nitrogen atom. Other types of bonding occur in some rare cases and include twofold and threefold nitrosyl bridges o/jr-dihaptonitrosyls (so-called side-on nitrosyls) and isonitrosyls (M-O-N bound), as reviewed in [6]. 

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