The reactions of N-diethylaminothiocarbonyl-benzamidines Et2N-C(S)-N=C(NHR)-Ph (1: R = Ph, 2: R = C3H7, 3: R = H) with gold(III) compounds were studied. Treatment of 1 and 2 with equivalent amounts of tetrachlorogold acid gives 2,3-substituted 5-diethylamino-1,2,4- thiadiazoliumdichloroaurates(I) (1a, 2a). With tetrachlorogold acid in excess 1 yields 2,3-diphenyl- 5-diethylamino-l,2,4-thiadiazolium-tetrachloroaurate(III) 1b. With 3 and Na[AuCl4] bis(3-phenyl-5- diethylamino-1,2,4-thiadiazolium)-chloride-tetrachloroaurate(III) 3b is produced. The structures of la, 2a and 3b were investigated by X-ray structure analysis. In la and 2a the dichloroaurate(I) ions are linear. In the 1,2,4-thiadiazolium cations the N-C-bond lengths alternate characteristically. In 3b the tetrachloroaurate(III) ion is square planar. The 1,2,4-thiadiazolium cation shows a different alternation of N-C bond lengths in comparison with la and 2a which suggests changes in the thiadiazolium ring in 3b to a tautomeric form as confirmed by the localization of the H atom at the N atom in ring position 4 instead of ring position 2. The structures of 1a, 1b, 2a and 3b were confirmed by elemental analysis, ES-MS, FAB-MS, 1H and 13C NMR and IR spectroscopy.
本文研究了N-二乙基氨基硫代碳酰基苯甲酰胺Et2N-C(S)-N=C(NHR)-Ph (1: R = Ph, 2: R = C3H7, 3: R = H)与金(III)化合物的反应。将1和2与等量的四氯金酸处理后,得到2,3-取代的5-二乙基氨基-1,2,4-噻二唑二氯金酸盐(I) (1a, 2a)。当用过量的四氯金酸处理1时,得到2,3-二苯基-5-二乙基氨基-1,2,4-噻二唑四氯金酸盐(III) 1b。用3和Na[AuCl4]反应,得到双(3-苯基-5-二乙基氨基-1,2,4-噻二唑)-氯化物-四氯金酸盐(III) 3b。通过X射线结构分析,确定了1a、2a和3b的结构。在1a和2a中,二氯金酸盐(I)离子是线性的。在1,2,4-噻二唑阳离子中,N-C键长具有特征性的交替。在3b中,四氯金酸盐(III)离子是方形平面的。1,2,4-噻二唑阳离子的N-C键长交替方式与1a和2a不同,这表明在3b中,噻二唑环发生了变化,形成了一种互变异构体,这得到了在环位4处的H原子定位的证实,而不是在环位2处。通过元素分析、ES-MS、FAB-MS、1H和13C NMR和IR光谱确定了1a、1b、2a和3b的结构。