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Synthesis and coordination properties of highly preorganised polyamine macrocycles
Author(s) -
Bazzicalupi Carla,
Bencini Andrea,
Bianchi Antonio,
Giorgi Claudia,
Paoletti Piero,
Valtancoli Barbara,
Fusi Vieri,
GarciaEspañta Enrique,
Llinares Josè M.
Publication year - 2001
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570380606
Subject(s) - chemistry , potentiometric titration , piperazine , polyamine , molecule , aqueous solution , titration , anthracene , metal , benzene , metal ions in aqueous solution , inorganic chemistry , coordination complex , polymer chemistry , combinatorial chemistry , stereochemistry , ion , organic chemistry , biochemistry
Synthesis and characterisation of the new macrocyclic ligands L1‐L4 are reported. The ligands present one or two pentaamine moieties, each containing two piperazine rings, linked by benzene or anthracene spacers. Interaction of L1 with H + , Cu(II), Zn(II), Hg(II), and Pd(II) and of L3 with H + , and Cu(II) has been studied by potentiometric titrations in 0.15 mol dm −3 NaCl aqueous solution at 298.1 ±0.1 K. The thermodynamic data suggest that in the metal complexes only three nitrogen donor atoms bind each metal ion. As a consequence of the low coordination number, these complexes are promising receptors for different molecules.