Journal
MOLECULES
Volume 26, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/molecules26061563
Keywords
osmium; cyclometalation; osmium cyclometalated complex; osmacycle; pincer complex; catalysis; photophysics; anticancer activity
Funding
- DGAPA-UNAM [IN-207419]
- CONACyT [A1-S-15068]
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The synthesis of cyclometalated osmium complexes is more complicated and requires specific conditions compared to other transition metals, but osmacycles have diverse applications in various fields.
The synthesis of cyclometalated osmium complexes is usually more complicated than of other transition metals such as Ni, Pd, Pt, Rh, where cyclometalation reactions readily occur via direct activation of C-H bonds. It differs also from their ruthenium analogs. Cyclometalation for osmium usually occurs under more severe conditions, in polar solvents, using specific precursors, stronger acids, or bases. Such requirements expand reaction mechanisms to electrophilic activation, transmetalation, and oxidative addition, often involving C-H bond activations. Osmacycles exhibit specific applications in homogeneous catalysis, photophysics, bioelectrocatalysis and are studied as anticancer agents. This review describes major synthetic pathways to osmacycles and related compounds and discusses their practical applications.
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