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Synthesis and properties of fluorescent 4'-azulenyl-functionalized 2,2':6',2?-terpyridines.

ABSTRACT: 4'-Azulenyl-substituted terpyridines were efficiently synthesized following the Kröhnke methodology via azulenylchalcone intermediates. These azulenyl-containing terpyridines showed fluorescent emission with a fluorescence quantum yield varying from 0.14, in the case of parent terpyridine, to 0.64 when methyl groups are grafted on the azulenyl seven-membered ring. According to the crystal structures and TDDFT calculations, different twisting of the aromatic constituents is responsible for the observed fluorescent behavior. The electrochemical profile contains one-electron oxidation/reduction steps, which can only be explained on the basis of the redox behavior of the azulene unit. The ability of the 4'-azulenyl 2,2':6',2?-terpyridine to bind poisoning metal cations was studied by UV-vis titrations using aqueous solutions of Hg(II) and Cd(II) chlorides as illustrative examples.

SUBMITTER: Ion AE

PROVIDER: S-EPMC5082674 | biostudies-other | 2016

REPOSITORIES: biostudies-other

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Synthesis and properties of fluorescent 4'-azulenyl-functionalized 2,2':6',2″-terpyridines.

Ion Adrian E AE Cristian Liliana L Voicescu Mariana M Bangesh Masroor M Madalan Augustin M AM Bala Daniela D Mihailciuc Constantin C Nica Simona S

Beilstein journal of organic chemistry 20160811

4'-Azulenyl-substituted terpyridines were efficiently synthesized following the Kröhnke methodology via azulenylchalcone intermediates. These azulenyl-containing terpyridines showed fluorescent emission with a fluorescence quantum yield varying from 0.14, in the case of parent terpyridine, to 0.64 when methyl groups are grafted on the azulenyl seven-membered ring. According to the crystal structures and TDDFT calculations, different twisting of the aromatic constituents is responsible for the ob ...[more]

PMID: 27829888

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