Cadmium(II) and Lead(II) Complexes with Novel Macrocyclic Receptors Derived from 1,10-Diaza-15-crown-5

[7,13-Bis(2-aminobenzyl)-1,4,10-trioxa-7,13-diazacyclopentadecane]diisothiocyanatobarium(II)

“…In (I), both pendant aniline arms of the receptor ligand are oriented on the same side of the macrocyclic plane, resulting in a syn conformation, in contrast with the anti conformation found for the free L ligand (Esteban et al, 2000). This conformation was also found in the analogous perchlorate complex, but the presence of thiocyanate groups in the Ba coordination sphere of (I), instead of perchlorate groups,…”

2,7-Dioxa-15,19-diazatricyclo[19,4,0,08,13]pentacosa-8,10,12,21,23,25(1)-hexaene

“…The authors wish to acknowledge the purchase of the CAD-4 diffractometer and ®nancial support of this work under grants DPT/TBAG1 and TBAG-1693 of the Scienti®c and Technical Research Council of Turkey. Over the last two decades, macrocyclic multidentate Schiff base N x O y (where x = 2,3 and y = 2,3) donor-type ligands have been investigated as potential metal-ion-selective ionophores (Lindoy et al, 1993;Esteban et al, 2000). In particular, macrocycles have been widely studied as complexation agents for alkaline, alkaline-earth and transition-metal ion (especially lanthanides) recognition with particular metal-ion binding applications (e.g.…”

1,14-Dioxa-5,10-diaza-2,3:12,13-dibenzocyclooctadeca-2,12-diene monohydrate

“…Macrocyclic multidentate ligands, such as the 16-, 17-, 18-and 19-membered rings containing the O x N y -donor type (where x = 2 and 3, and y = 2 and 3), have been the subject of structural studies as potential metal-ion selective reagents for transition-metal-ion recognition (Goodwin et al, 1982;Adam et al, 1983;Lindoy, 1987;Lindoy et al, 1993;Esteban et al, 2000). Particular metal-ion binding applications (e.g.…”

“…Particular metal-ion binding applications (e.g. selective extraction of heavy and precious metals) are of great interest in environmental, inorganic, organic, bio-and coordination chemistry (Lindoy, 1997;Hayvalõ et al, 1999;Esteban et al, 2000;Vicente et al, 2000;Ho È kelek, Kaya & Kõlõc Ë, 2001).…”