Extraction of trivalent lanthanide cations by diphenyl phosphinic acid

2-Aminopyridinium diphenylphosphinate monohydrate

“…For bidentate ligands with both hard (nitrogen) and soft (phosphorous) donors, see: Espinet & Soulantica (1999); Jeffrey & Rauchfuss (1979). For the use of diphenylphosphinic acid in the extraction of trivalent lanthanide cations and as a flame retardant in the epoxy resins used in printed circuit boards, see: Almeida (1974); von Gentzkow et al (1996); Huber et al (1998). Table 1 Hydrogen-bond geometry (Å , ).…”

“…Diphenylphosphinic acid and its derivatives have been widely used because of their variety of applications. It has been extensively used for extraction of trivalent lanthanide cations and as a flame retardant in epoxy resins that are used in printed circuit boards (Almeida, 1974;Huber, et al, 1998;von Gentzkow, et al, 1996).…”

Lanthanide extraction with 2,5-dimethyl-2-hydroxyhexanoic acid

“…In experiments using diphenylphosphinic acid (HY) in CHCl^, a number of extracted species were formed; ^n^^^2^3-n n = 0-3 (30). The nondimerized ligands were visualized as binding bidently, perhaps with the incorporation of water molecules into the chelate ring.…”

Lanthanide extraction with 2,5-dimethyl-2-hydroxyhexanoic acid

“…The dependence of D on the phosphinic acid concentration has been found to vary between 2.2 and 3» and may suggest a mixture of complex species (28,29). In experiments using diphenylphosphinic acid (HY) in CHCl^, a number of extracted species were formed; ^n^^^2^3-n n = 0-3 (30). The nondimerized ligands were visualized as binding bidently, perhaps with the incorporation of water molecules into the chelate ring.…”