N‐Acyl‐thioharnstoffe – effektive Extraktionsmittel für die Flüssig‐Flüssig‐Extraktion von Metallionen

Aqueous solubilities of five N-(diethylaminothiocarbonyl)benzimido derivatives at T = 298.15 K

“…While pK values of a variety of structural analogues were successfully measured by pH potentiometry before, no data for the title compounds could be obtained (Hartung et al, 1985;Mühl et al, 1986). Hence, at this stage, we assume neutral species being predominant in aqueous solutions at environmentally relevant medium pH ranges.…”

Light-induced cis/trans isomerization of cis-[Pd(L-S,O)2] and cis-[Pt(L-S,O)2] complexes of chelating N,N-dialkyl-N′-acylthioureas: key to the formation and isolation of trans isomers

“…Generally N,N-dialkyl-N'-acylthioureas show a marked tendency to coordinate to d 8 3 ], not easily accessible by other means [12]. In this context the overwhelming tendency to form cis complexes of the numerous complexes of divalent transition metal ions with simple N,N-dialkyl-N'-acyl(aroyl)thioureas which have been structurally characterized is striking [9].…”

“…Ligands of the general type N,N-dialkyl-N'-acyl(aroyl)thioureas (HL; R 1 2 NC(S)NHC(O)R 2 , R 1 = alkyl, R 2 = alkyl or aryl groups), first prepared more than 80 years ago [1], have long been known to readily form stable, uncharged coordination compounds with numerous transition metal ions as shown by the studies of Hoyer and Beyer more than three decades ago [2,3], and later by inter alia Konig and Schuster [4][5][6][7]. We have been interested in fundamental aspects of the coordination chemistry of N,N-dialkyl-N'-acyl(aroyl)thioureas with some members of the platinum group metals (PGMs) in view of their potential application in solvent extraction, preconcentration, separation and even trace analytical determination of the PGMs [8].…”

Thermochemistry of Cu(II) and Ni(II) complexes with N,N-di-n-butyl-N′-thenoylthiourea and N,N-di-iso-butyl-N′-thenoylthiourea

“…Over the past two decades, various substituted N-acylthioureas have been the subject of investigations, including the thermodynamics of their complexation reactions towards metal ions in solution, thus affording conclusions on their extraction properties [1,2]. More recently, the thermochemistry of this class of compounds became the subject of interest [3], including transition metal complexes [4].…”