Synthesis and structures of ruthenium di- and tricarbonyl complexes derived from 4,5-diazafluoren-9-one.

Abstract

Carbon monoxide (CO) has recently been shown to impart beneficial effects in mammalian physiology and considerable research attention is now being directed toward metal-carbonyl complexes as a means of delivering CO to biological targets. Two ruthenium carbonyl complexes, namely trans-dicarbonyldichlorido(4,5-diazafluoren-9-one-κ(2)N,N')ruthenium(II), [RuCl2(C11H6N2O)(CO)2], (1), and fac-tricarbonyldichlorido(4,5-diazafluoren-9-one-κN)ruthenium(II), [RuCl2(C11H6N2O)(CO)3], (2), have been isolated and structurally characterized. In the case of complex (1), the trans-directing effect of the CO ligands allows bidentate coordination of the 4,5-diazafluoren-9-one (dafo) ligand despite a larger bite distance between the N-donor atoms. In complex (2), the cis disposition of two chloride ligands restricts the ability of the dafo molecule to bind ruthenium in a bidentate fashion. Both complexes exhibit well defined (1)H NMR spectra confirming the diamagnetic ground state of Ru(II) and display a strong absorption band around 300 nm in the UV.

• Authors: Jorge Jimenez, Indranil Chakraborty, Pradip Mascharak
• Journal: Acta crystallographica. Section C, Structural chemistry (Acta Crystallogr C Struct Chem) Vol. 71 Issue Pt 11 Pg. 965-8 (Nov 2015) ISSN: 2053-2296 [Electronic] England
• PMID: 26524168 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• Coordination Complexes
• Fluorenes
• Ligands
• Ruthenium Compounds
• fac-tricarbonyldichlorido(4,5-diazafluoren-9-one-kappaN)ruthenium(II)
• trans-dicarbonyldichlorido(4,5-diazafluoren-9-one-kappa(2)N,N')ruthenium(II)
• Ruthenium

Topics

• Coordination Complexes (chemical synthesis, chemistry)
• Crystallography, X-Ray
• Fluorenes (chemistry)
• Hydrogen Bonding
• Ligands
• Magnetic Resonance Spectroscopy
• Quantum Theory
• Ruthenium (chemistry)
• Ruthenium Compounds