Complexes of copper(II) with L-aspartic acid in systems with tetramines and non-covalent interactions between bioligands
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Coordination Chemistry
ISSN
0095-8972
EISSN
1029-0389
Wydawca
TAYLOR & FRANCIS LTD
DOI
URL
Rok publikacji
2013
Numer zeszytu
8
Strony od-do
1287-1302
Numer tomu
66
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(liczba autorów: 1)
Słowa kluczowe
Copper(II);
L-Aspartic acid;
Tetramine;
Adducts;
Mixed complexes;
Interaction
Open access
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Treść
In metal-free systems, interactions were studied between L-aspartic acid (Asp) and the tetramines 1,11-diamino-4,8-diazaundecane (3,3,3-tet) and 1,12-diamino-4,9-diazadodecane, spermine (Spm), and in the systems of both ligands with Cu(II). The formation of molecular complexes of the (Asp)H (x) (tetramine) type was evidenced by results from equilibrium and spectral studies. An increase in the efficiency of the reaction between the bioligands was observed with the increasing length of the polyamine chain. For aspartic acid, the centers of interaction are carboxyl and amine groups, whereas in tetramine molecules it is the amine groups. The effect of inversion was observed in the adducts (Asp)H-4(tetramine) and (Asp)H-3(tetramine). In ternary systems, the presence of molecular complexes of MLL, protonated complexes MLH (x) L, complexes MLL, and hydroxo complexes of the MLL(OH) (x) type were found, which were not detected in earlier systems with di- and triamines. In MLL complexes, where L=L-aspartic acid and L=polyamine, metallation involves the oxygens of carboxyl and amine of the amino acid, while the protonated tetramine is in the external coordination sphere, engaged in noncovalent interaction with the anchoring Cu(Asp). Moreover, in Cu(II)-Asp-tetramine in protonated species, noncovalent bonds were found between ligands which additionally stabilized the complex. At higher pH, hydroxyl groups were more effective in metallation than carboxyl groups from aspartic acid.
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System-identifier
PX-58c69637d5deeb4ce94bd9b6
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