K. Gloe et al., Macrocyclic and open-chain ligands with the redox switchable trithiadiazapentalene unit: synthesis, structures and complexation phenomena, COORD CH RE, 222, 2001, pp. 103-126
This review focuses on synthesis, structure and binding properties of crown
compounds and their open-chain analogues containing a trithiadiazapentalen
e building block. This heterocyclic unit favours in particular the complexa
tion and solvent extraction of the soft transition metal ions Ag(I), Pd(II)
, Hg(II) and Au(III). The redox active system trithiadiazapent alene/trithi
otriuret introduced into a crown ring allows the control of Ag(I) and Hg(II
) phase transfer in solvent extraction experiments. Crystal structures of m
etal complexes with these pentaleno crown compounds show significant differ
ences of both S S bond lengths of the trithiadiazapentalene unit and packag
e arrangements in the cell. (C) 2001 Elsevier Science B.V. All rights reser
ved.