CdII/ZnII discrimination by 2,5-diphenyl[1,3,4]oxadiazole based fluorescent chemosensors

M. Arca
Membro del Collaboration Group
;
A. Garau
Membro del Collaboration Group
;
A. Pintus
Membro del Collaboration Group
;
V. Lippolis
Ultimo
Membro del Collaboration Group
2018

Abstract

The coordination properties and photochemical response of two fluorescent ligands 2,5-bis{2-[bis(2- pyridylmethyl)aminomethyl]phenyl}[1,3,4]oxadiazole (L1) and 2,5-bis{2-[(1,4,7-triazacyclononane-1-yl)methyl]- phenyl}[1,3,4]oxadiazole (L2) towards ZnII and CdII are reported. The ligands contain the 2,5-diphenyl- [1,3,4]oxadiazole (PPD) fluorescent probe linked to two coordinating units, namely dipicolylamine (DPA) for L1 and 1,4,7-triazacyclononane (TACN) for L2, through a methylene spacer. Both ligands form mononuclear and dinuclear complexes with these metal ions in aqueous or hydro-alcoholic media. With regard to L1, only the mononuclear CdII complex is highly fluorescent at 368 nm, while the mononuclear ZnII and dinuclear CdII and ZnII complexes are not emissive. Ligand L2 forms an excimer emitting at 474 nm only in the presence of one equivalent of CdII, and potentiometric, spectrophotometric, spectrofluorimetric, and NMR studies and DFT calculations were performed to explain this peculiarity. The discrimination between CdII and ZnII is mainly due to the different coordination environments of the metal ions in the mononuclear complexes; namely CdII is coordinated by both the side arms of each ligand, while ZnII is bound only to one coordinating unit
Inglese
42
10
7869
7882
14
Esperti anonimi
internazionale
scientifica
Cadmium; Zinc; Fluorescence; Chemosensor
no
Formica, M.; Ambrosi, G.; Fusi, V.; Giorgi, L.; Arca, M.; Garau, A.; Pintus, A.; Lippolis, V.
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
8
reserved
File in questo prodotto:
File Dimensione Formato  
307 NJC-1 2018.pdf

Solo gestori archivio

Descrizione: pdf
Tipologia: versione editoriale
Dimensione 2.97 MB
Formato Adobe PDF
2.97 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Questionario e social

Condividi su:
Impostazioni cookie