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Robust Lanthanoid Picolinate-Based Coordination Polymers for Luminescence and Sensing Applications.

ABSTRACT: Picolinate-based segmented dianionic ligands L₁^2- (5-((4-carboxyphenyl)ethynyl)picolinate) and L₂^2- (5,5'-(ethyne-1,2-diyl)dipicolinate) have been used in the synthesis of the highly robust and luminescent europium(III) coordination polymers [(CH₃)₂NH₂][Eu(H₂O)₂(L₁)₂] (1) and [(CH₃)₂NH₂][Eu(L₂)₂]·H₂O·CH₃COOH (2). Both 1 and 2 exhibit high selectivity for detection of nitroaromatic compounds since they act as quenchers of the Eu³⁺ emission. Stern-Volmer plots, using nitrobenzene as a quencher, yielded values of K_SV = 150 M^-1 and 160 M^-1 for 1 and 2, respectively. Luminescence studies in the presence of different metal ions indicate a high selectivity for Fe³⁺ detection, with K_SV values of 471 M^-1 and 706 M^-1 for 1 and 2, respectively. Both 1 and 2 possess extremely robust extended structures, leading to emissive properties that are stable in a wide pH range.

SUBMITTER: Jornet-Molla V

PROVIDER: S-EPMC8454995 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Robust Lanthanoid Picolinate-Based Coordination Polymers for Luminescence and Sensing Applications.

Jornet-Mollá Verónica V Dreessen Chris C Romero Francisco M FM

Inorganic chemistry 20210706 14

Picolinate-based segmented dianionic ligands L12- (5-((4-carboxyphenyl)ethynyl)picolinate) and L22- (5,5'-(ethyne-1,2-diyl)dipicolinate) have been used in the synthesis of the highly robust and luminescent europium(III) coordination polymers [(CH3)2NH2][Eu(H2O)2(L1)2] (1) and [(CH3)2NH2</ ...[more]

PMID: 34229428

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