The Role of Ligand Topology in the Decomplexation of Luminescent Lanthanide Complexes by Dipicolinic Acid |
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| Authors: | Dr Federica Mian Dr Gregorio Bottaro Dr Roberta Seraglia Dr Marco Cavazzini Dr Silvio Quici Prof Lidia Armelao |
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| Institution: | 1. Dipartimento di Scienze Chimiche Università di Padova and INSTM, Padova, Italy;2. ICMATE-CNR and INSTM, Dipartimento di Scienze Chimiche Università di Padova, Padova, Italy;3. ISTM-CNR, Milano, Italy |
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| Abstract: | In this study, we present the aqueous solution behavior of two luminescent lanthanide antenna complexes (Eu3+? 1 , Dy3+? 9 ) with different ligand topologies in the presence of dipicolinic acid (DPA, pyridine‐2,6‐dicarboxylic acid). Macrocyclic (1,4,7,10‐tetraazacyclododecane‐1,4,7‐triacetic acid, DO3A, 9 ) and acyclic (1,4,7‐triazaheptane‐1,1,7,7‐tetraacetic acid, DTTA, 1 ) ligands have been selected to form a ratiometric pair in which Dy3+? 9 acts as a reference and Eu3+? 1 acts as a probe for the recognition of DPA. The pair of luminescent complexes in water reveals the capability to work as a DPA luminescent sensor. The change of emission intensity of Eu3+ indicates the occurrence of a new sensitization path for the lanthanide cation through excitation of DPA. NMR evidence implies the presence of free 1 and mass spectrometry shows the formation of emitting EuDPA2]? as a result of a ligand exchange reaction. |
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| Keywords: | decomplexation dipicolinic acid lanthanide complexes luminescence ratiometric sensor |
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