Abstract
Ferrocene derivatives la, lb and 2 containing oxazoline substituents act as efficient voltammetric sensors of Mg2+ and Ca2+ ions in acetonitrile solution in concentrations as low as 10 mol%: a new redox peak appears in the cyclic voltammogram, positively shifted by 310-360 mV for 1a and 1b, and by 160-190 mV for 2, compared to E-1/2 of the free ligand. For the bisferrocenyldiimine derivative 3 the shift is 150-160 mV. Compounds la, lb and 3 are also responsive to Cu2+ ions (shifts of 250, 320 and 160 mV, respectively) and compound 3 is responsive to Zn2+ ions (150 mV shift) with no interference from a large excess of several other metal salts. UV-vis spectrophotometric studies and H-1-NMR titration experiments confirm that the oxazoline or imine groups are the sites of metal complexation.
Original language | English |
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Pages (from-to) | 134-138 |
Number of pages | 5 |
Journal | Journal of Organometallic Chemistry |
Volume | 637 |
Issue number | Special Issue SI |
Early online date | 20 Nov 2001 |
DOIs | |
Publication status | Published - 3 Dec 2001 |
Keywords
- ferrocene
- oxazoline
- electrochemistry
- sensors
- molecular recognition
- electrochemical recognition
- supramolecular systems
- conjugated link
- lariat ethers
- crown ethers
- ligands
- molecules
- chemistry
- magnesium
- behaviour