| Autor: |
Andrea Bencini, Barbara Valtancoli, Costanza Ravagli, Carla Bazzicalupi, Claudia Giorgi, Enrico Faggi, Andrea Danesi |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
The Open Inorganic Chemistry Journal. 2:80-89 |
| ISSN: |
1874-0987 |
| DOI: |
10.2174/1874098700802010080 |
| Popis: |
The synthesis and characterization of two new open-chain ligands, L1 and L2, containing two 2,2'-dipyridine units connected respectively by a pentaethylenhexamine and a pentapropylenhexamine chain, is reported. Zn(II) com- plexation has been studied by means of potentiometric and UV-vis spectrophotometric measurements in aqueous solution. Both ligands form stable mono- and dinuclear complexes, the metal ions being coordinated by a single dipyridine unit and by the adjacent amine groups. The ability of the binuclear Zn(II) complexes as nucleophilic agents in hydrolytic processes has been tested by using bis(p-nitrophenyl) phosphate (BNPP) as substrate. Both complexes display high rate enhance- ments in BNPP cleavage in aqueous solution. The study outlines that different mechanisms are operative in BNPP cleav- age in the presence of the L1 and L2 complexes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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