Synthesis and molecular structure of chloro(3-thiapentane-1,5-dithiolato)oxorhenium(V)
摘要:
Reaction of [BzEt(3)N][ReOCl4] (1) with 0.9 equiv, of 3-thiapentane 1,5-dithiol (HSSSH) in chloroform delivers [ReO(SSS)Cl] (2). The chloro ligand can be substituted by mercaptides when 2 is heated with an excess of a mercaptane, e.g. C2H5SH, in acetonitrile. Single crystal X-ray analysis of 2 shows square-pyramidal geometry.
Neutral oxorhenium(V) complexes with tridentate dithiolates and monodentate alkane- or arene-thiolate coligands
摘要:
Oxorhenium(v) complexes [ReO(SXS)(SR)] (where HSXSH = 3-thia- or 3-oxa-pentane-1,5-dithiol and RSH = alkane- or arene-thiol) have been synthesized by a ligand exchange reaction of [NEt(3)(CH(2)Ph)][ReOCl4] with a mixture of HSXSH and RSH in methanol-acetonitrile. The compounds were purified by column chromatography or preparative TLC and characterized by elemental analysis, infrared and H-1 NMR spectroscopy. The structure of (4-methoxybenzenethiolato)(3-oxapentane-1,5-dithiolato)oxorhenium(v) has been determined by X-ray crystallography. The co-ordination is square-pyramidal with the Re atom displaced from the basal plane by 0.728 Angstrom. Co-ordination of the ether group is indicated by the short Re-O(ether) bond distance of 2.103 Angstrom.
The tripodal ligand 2,2',2''-nitrilotris(ethanethiol) (N(SH)(3)=N(CH2CH2SH)(3)) reacts with [ReO(SC6H5)(4)](-) as rhenium(V) precursor to give unexpectedly the square-pyramidal oxorhenium(V) species [ReO(NH(CH2CH2S)(2))(SC6H5)] (1). The reaction mechanism is assumed to involve cleavage of the chelate ligand catalysed by the metal core. Treatment of 1 with methyl iodide at room temperature leads to substitution of the thiolate ligand by iodide and methylation of the amine nitrogen to the compound [ReO(NCH3(CH2CH2S)(2))I] (2).