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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Lazarides, T. | en |
| dc.contributor.author | Miller, T. A. | en |
| dc.contributor.author | Jeffery, J. C. | en |
| dc.contributor.author | Ronson, T. K. | en |
| dc.contributor.author | Adams, H. | en |
| dc.contributor.author | Ward, M. D. | en |
| dc.date.accessioned | 2015-11-24T16:41:16Z | - |
| dc.date.available | 2015-11-24T16:41:16Z | - |
| dc.identifier.issn | 1477-9226 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/8392 | - |
| dc.rights | Default Licence | - |
| dc.subject | active receptor molecules | en |
| dc.subject | crown-ether receptors | en |
| dc.subject | electrochemical recognition | en |
| dc.subject | polypyridine complexes | en |
| dc.subject | selective recognition | en |
| dc.subject | cooperative binding | en |
| dc.subject | metal-cations | en |
| dc.subject | ligands | en |
| dc.subject | ruthenium(ii) | en |
| dc.subject | ion | en |
| dc.title | Luminescent complexes of Re(I) and Ru(II) with appended macrocycle groups derived from 5,6-dihydroxyphenanthroline: cation and anion binding | en |
| heal.type | journalArticle | - |
| heal.type.en | Journal article | en |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.identifier.primary | Doi 10.1039/B416293e | - |
| heal.identifier.secondary | <Go to ISI>://000226553000017 | - |
| heal.identifier.secondary | http://pubs.rsc.org/en/content/articlepdf/2005/dt/b416293e | - |
| heal.language | en | - |
| heal.access | campus | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.publicationDate | 2005 | - |
| heal.abstract | A range of ligands in which a macrocyclic unit is fused to a 1, 10- phenanthroline unit has been prepared starting from 5,6- dihydroxyphenanthroline. The ligands are L(1) in which the pendant ligand is 18- crown- 6; L(2), in which the pendant ligand is benzo- 24- crown- 8; and L(3), in which the macrocycle contains two carboxamide units. Ligands L(1) and L(2) can bind Group 1 and 2 metal cations in their crown- ether cavities; L(3) contains two H- bond ( amide) donors and is suitable for anion- binding. Luminescent complexes of the form [ Ru( bipy) (2)L] (2+), [ ReL( CO)(3)Cl] and [ RuL( CN) (4)] (2-) were prepared and some were structurally characterised; their interactions with various guest species were investigated by luminescence and NMR spectroscopy. For complexes with the crown ethers ( L(1) and L(2)), binding of K(+) was rather weak, but the electrostatic effect due to the charge on the host complex was clear with [ RuL(1) ( CN)(4)] (2-) binding K(+) more strongly than [ Ru( bipy)(2)L(1)] (2+). Binding to the pendant crown ethers was much stronger with Ba(2+), and both [ ReL(1) ( CO) (3)Cl] and [ ReL(2) ( CO)(3)Cl] showed substantial luminescence quenching in MeCNon addition of Ba(2+) ions, with binding constants of 4. 5 x 10(4) M(-1) for [ ReL(1) ( CO)(3)Cl] /Ba(2+) and 1. 3 x 10(5) M(-1) for [ ReL(2) ( CO)(3)Cl] / Ba(2+). Complexes [ Ru( bipy)(2)L(3)] (2+) and [ ReL(3) ( CO)(3)Cl], due to their H- bond donor sites, showed binding of dihydrogenphosphate to the macrocycle. Whereas [ ReL(3) ( CO)(3)Cl] showed 1 : 1 binding with ( H(2)PO(4))(-) in dmso with a binding constant of 65 M(-1), [ Ru( bipy)(2)L(3)] (2+) showed 1 : 2 binding, with microscopic association constants of ca. 1 x 10(6) and 1. 6 x 10(6) M(-1) in MeCN. The fact that K(2) > K(1) suggests a cooperative interaction whereby binding of the first anion makes binding of the second one easier to an extent which overcomes electrostatic effects, and a model for this is proposed which also accounts for the substantial increase in luminescence from [ Ru( bipy)(2)L(3)] (2+) ( 5- fold enhancement) when the second ( H(2)PO(4))(-) anion binds. Both [ Ru( bipy)(2)L(3)] (2+) and [ ReL(3) ( CO) (3)Cl] undergo complete luminescence quenching and a change in colour to near- black in the presence of ( anhydrous) fluoride in MeCN, probably due to deprotonation of the carboxamide group. These changes are however irreversible on a long timescale and lead to slow decomposition. | en |
| heal.publisher | Royal Society of Chemistry | en |
| heal.journalName | Dalton Transactions | en |
| heal.journalType | peer reviewed | - |
| heal.fullTextAvailability | TRUE | - |
| Appears in Collections: | Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Lazarides-2005-Luminescent complexe.pdf | 319.72 kB | Adobe PDF | View/Open Request a copy |
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