Bismuth complexes sulfur ligands

In the case of three bidentate sulfur ligands, e.g. [Bi(pedt)3]2-EtOH (pedt = 1-pyrrolidinecarbondithioate), more complex structures are formed. The dimer contains two differently coordinated bismuth atoms one is trigonal prismatic with an extra position on a rectangular face and the other bismuth atom is pentagonal pyramidal. The overall molecular structure is (80).270... 

Similar unfavorable constants can be obtained for the other cases. A successful agent in complexing the Hg(II) is BAL (British anti-Lewisite), 2,3-dimercaptopropanol, with potent sulfur ligands for the mercury, and also for arsenic, antimony, bismuth, and gold. It is injected intramuscularly in 10% solution in peanut oil at a dose rate of 3 mg/kg of body weight every 4 hr for two days, and after that at decreasing frequency until recovery. 

Complexes of bismuth chloride with 2 equiv of the AT,AT-substituted dithioxamide ligands of the general formulas [BiCl3 RNHC(S)C(S) NHR 2] (R = Me, Et, Pr, nBu, CH2Ph) likely involve five-membered chelate interactions (123) as demonstrated by the structurally characterized example [BiCl3 EtNHC(S)C(S)NHEt 2] Me2CO, which involves a seven-coordinate pentagonal bipyramidal environment for bismuth (124), with chlorine atoms in axial positions [Bi-Cl 2.635(10) and 2.717(1) A] and one equatorial [Bi-Cl 2.651(12) A] with four sulfur centers [Bi-S 2.818(13)-3.042(12) A],... 

Mercury, lead, bismuth and other transition and post-transition metals form water-insoluble sulfide salts. The preeipitation of these sulfides is part of the traditional method for the qualitative determination of metals. The formation of a precipitate can be considered as the formation of a zero-charged, water-insoluble complex the formation of the sulfide precipitates indicates that these metals prefer sulfur-containing ligands to oxygen-containing ligands (in this case S to... 

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