Molecular Modeling-Studien schwefelhaltiger Wirt/Gast-Systeme

Rambusch, Torsten; Hollmann-Gloe, Kerstin; Gloe, Karsten

doi:10.1002/(sici)1521-3897(199904)341:3<202::aid-prac202>3.3.co;2-1

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“…This result correlates with the degree of size match between the metal ion and the macrocyclic ring and is in agreement with literature data for relevant complexes [10,15,27,28], suggesting the formation of 1:2 sandwich or 1:2 linear complexes and 1:1 (in or above the macrocyclic ring) structure arrangements with different coordination numbers (Scheme 2). This observation reflects the known variation of the Ag(I) coordination number -with a preference between 2 and 6 -depending on the ligand used [24,33].…”

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confidence: 67%

Extraction Studies of Heavy Metal Ions Employing Benzothiaoxacrown Compounds

Tsend-Ayush

Wenzel

Gloe

et al. 2016

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Benzothiaoxacrown compounds with different numbers of sulfur and oxygen donor atoms (between 4 to 7 donors) dissolved in an organic diluent selectively extract the soft metal ions Ag(I) and Hg(II) from a mixture of Co(II), Ni(II), Cu(II), Zn(II), Ag(I) and Hg(II) present in an aqueous phase. Generally, the extraction efficiency depends on the specific structure of the benzothiaoxacrowns, on the organic diluent employed, as well as on the counter ion present in the aqueous phase. High extractions of Ag(I) and Hg(II) were achieved with all ligands from perchlorate and picrate aqueous media into nitrobenzene organic solutions. In the case of Cu(I) the extraction is significant lower; only ligand 5 with the O 2 S 4 donor atom set gives a moderate extractability. The composition of the extracted complexes depends on the crown ring size and ranges from 1:1 to 1:2 (M:L). Polarographic, UV-Vis and ESI mass spectrometric studies provide a further insight into the complex formation behavior.

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