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Synthesis, Structure and Binding Properties of Nickel and Copper [14]Cyclidene Complexes with Appended Aza Crown Ethers
Author(s) -
KorybutDaszkiewicz Bohdan,
Taraszewska Joanna,
Zięba Katarzyna,
Makal Anna,
Woźniak Krzysztof
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200300955
Subject(s) - chemistry , copper , nickel , crown (dentistry) , polymer chemistry , stereochemistry , organic chemistry , combinatorial chemistry , medicine , dentistry
Copper( II ) and nickel( II ) cyclidenes linked with one or two 15‐azacrown‐5 ethers ( 3Ni , 4Ni and 4Cu ) as well as similar model morpholine‐substituted derivatives ( 2Cu , 2Ni ) have been synthesized and characterized using ESI mass‐spectrometry, X‐ray diffraction, spectroscopic methods and elemental analysis. Cyclic voltammetry of the copper complexes exhibits two reversible redox couples Cu II/III and Cu II/I , whereas the nickel complexes show reversible Ni II/III and irreversible Ni II/I redox processes. Cyclic and differential pulse voltammetry have been used to study interactions of metal cations and amino acids with the above complexes. Na + and Li + interact weakly with the 3Ni complex. In the presence of Mg 2+ , the ligand isomerizes from aldehyde to enolate ion, which interacts strongly with Mg 2+ . The presence of lysine caused a more pronounced shift of the Cu II/III potential in 4Cu than did leucyne. This suggests that there are interactions between the NH 3 + group and the crown ether moiety and between the carboxylic group and the Cu III center of the former guest. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)