1,2-双烷基(芳基)硫代乙烷对金的萃取性质和配合物的研究

本文研究了1,2-双烷基(芳基)硫代乙烷(L)——1,2-双(正辛基硫代)乙烷(BOTE)、1,2-双(正戊基硫代)乙烷(BATE)、1,2-双(苯基硫代)乙烷(BPTE)对金的萃取及其配合物的性质.双烷基硫代乙烷对金具有很强的萃取能力,可定量地萃取金.在溶液中,当[L]≥[Au~(3 )]时,Au与L形成1∶1Au-L配合物,而在[L]<[Au~(3 )]时,则为2∶1Au-L配合物.固态时,Au(Ⅲ)、Au(Ⅰ)与L只形成2∶1配合物(AuCl_3)_2L和AaCl)_2L.讨论了BOTE和BATE与Au(Ⅲ)、Au(Ⅰ)配合物的IR和~1H NMR谱.IR谱证实了关于Au(Ⅰ)配合物为线型结构的推断,并借助金原子的交换机理,解释了配合物与配位体的~1H NMR谱外观相似的原因.详细分析了Au(Ⅲ)配合物低频区的IR数据,提出了配合物有离子型结构的新证据.

Studies on the properties of extraction and complexes of gold with 1,2-bisalkyl (ARYL) thioethane

In this paper the extraction of gold with 1,2-bisalkyl (aryl) thioethane(L) -- 1, 2-bis (n-octylthio) ethane (BOTE), 1, 2-bis (n-amylthio) ethame (BATE), 1,2-bis(phenylthio) ethane (BPTE) and complexes have been studied. Gold is extracted with high efficiency and may be quantitatively isolated with bisalkylthioethane. In solution, 1:1 and 2:1 complexes are found at [L] > [Au]and [Au] > [L] respectively. In solid state, only complexes of formulas (AuCl3)2L and (AuCl)2L are formed. The IR and ^^1H NMR spectra of complexes of Au(II), Au(I) with BOTE, BATE are discussed. The IR date support the conclusion suggested in literature for linear configuration of Au(I) complexes and the apparent analogy between the 1H NMR of complexes and tree ligand is explained by an exchange mechanism of Au atom. For Au(II) complexes, the IR data of low frequency are analysed in detail and there are new evidences supporting that the complexes are ionic.