| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1308048 | Inorganica Chimica Acta | 2006 | 10 Pages |
Divalent osmium complexes of the form [Os(N–N)2L–L](PF6-)2 where N–N was a polypyridyl, and L–L was either cis-1,2-bis(diphenylphosphino)ethene (dppene) or cis-1,2-vinylenebis(diphenylarsine) (dpaene) have been synthesized and characterized. X-ray structures were determined for three complexes and for the free dpaene molecule. It was observed that the P–C bond lengths, and C–P–C bond angles do not change significantly when complexed to osmium. It was observed the As–C bond lengths shorten by 2.3 pm and the C–As–C bond angles broaden by 5.6° when dpaene was complexed to osmium. These changes in the arsine structure may indicate a different method of backbonding between arsenic and osmium. It was found that the arsine complexes had absorption and emission that were to the red of analogous phosphine complexes. In violation of “energy gap law”, the dpaene complexes were found to have higher quantum yields. This may be due to the way that the arsenic atoms bond to osmium.
Graphical abstractOsmium complexes based upon cis-1,2-vinylenebis(diphenylarsine) have been synthesized and characterized. The complexes exhibit phosphorescence that range from 588 to 624 nm, and emission lifetimes that range from 0.4 to 2.8 μs. X-ray structures show unusual behavior of the arsine and pyridyl ligands and may provide evidence for As(4d)–Os(5d) orbital backbonding.Figure optionsDownload full-size imageDownload as PowerPoint slide
