[ReO(N2O2)X] Complexes:  “4 + 1”?

• Published in: Inorganic chemistry Vol. 40; no. 18; pp. 4623 - 4626
• Main Authors: Xu, Liang, Lowe, Mark P., Rettig, Steven J., Orvig, Chris
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 27.08.2001
• Subjects: Chelating Agents - chemical synthesis; Chelating Agents - chemistry; Chromatography, High Pressure Liquid; Crystallography, X-Ray; Indicators and Reagents; Ligands; Models, Molecular; Organometallic Compounds - chemical synthesis; Organometallic Compounds - chemistry; Phosphinic Acids - chemistry; Radioisotopes; Radiopharmaceuticals - chemistry; Rhenium - chemistry; Spectrophotometry, Infrared
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic001416g

[ReO(ppme)X] (where ppme2- is 2,5-diazo-N,N‘-dimethylhexyl-1,6-bis(phenylphosphinate), X = Br0.3Cl0.7) has been synthesized via a substitution reaction and structurally characterized. The coordination geometry is a distorted octahedron and one phosphinate coordinates cis and the other trans to the oxo O atom. This coordination mode is conserved in all [ReOppmeX] complexes synthesized in this study. [ReO(ppme)Cl] has been prepared by a reduction/complexation reaction from [NH4][ReO4]. [ReO(ppme)Cl] reacts with thiocyanate and benzene thiolate forming [ReO(ppme)X] (X = -NCS, -SC6H5), but the one-pot synthesis of the respective ternary thiolate complexes from perrhenate was not successful. The reduction/complexation reaction of a thiol, H2ppmeCl4, and perrhenate resulted in the formation of [H3ppme][ReO(SR)4], the reaction of which with [ReO(ppme)Cl] does not lead to [ReO(ppme)SR] in high yields.