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EnglishThe tetra-azamacrocyclic nickel(II) complex [NiII(4)]2+, has been synthesized, structurally characterized and investigated as a fluorescence switch. [NiII(4)]2+, which in solution displays an emission spectrum typical of naphthalene derivatives, undergoes a deprotonation at moderately basic pH values (pKa=8.8 in 4:1 MeCN–water solution) involving the dienic moiety of the macrocyclic system. As the deprotonated species, [NiII(8)]+, is distinctly less emissive than its dienic analogue, the fluorescence of [NiII(4)]2+ in a 4:1 MeCN–water solution is quenched by addition of a base and revived by addition of an acid. So, a reversible variation of the emission intensity can be obtained by simply varying the pH of the solution.
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| Titolo: | Searching for New Fluorescence Switches: Naphthalene-containing Metal Complexes whose Emission Can Be Controlled by pH Variations | |
| Autori: | ||
| Data di pubblicazione: | 2000 | |
| Rivista: | ||
| Abstract: | The tetra-azamacrocyclic nickel(II) complex [NiII(4)]2+, has been synthesized, structurally characterized and investigated as a fluorescence switch. [NiII(4)]2+, which in solution displays an emission spectrum typical of naphthalene derivatives, undergoes a deprotonation at moderately basic pH values (pKa=8.8 in 4:1 MeCN–water solution) involving the dienic moiety of the macrocyclic system. As the deprotonated species, [NiII(8)]+, is distinctly less emissive than its dienic analogue, the fluorescence of [NiII(4)]2+ in a 4:1 MeCN–water solution is quenched by addition of a base and revived by addition of an acid. So, a reversible variation of the emission intensity can be obtained by simply varying the pH of the solution. | |
| Handle: | http://hdl.handle.net/11571/108438 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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