Síntese e caracterização da MOF [Eu2(BDC)3(H2O)4]n em nanoescala passivada com polivinilpirrolidona para aplicação como tinta fluorescente antifalsificação e em revelação de impressões digitais latentes

• DOI: https://doi.org/10.22533/at.ed.3611125040414

• Palavras-chave: MOFs, európio, antifalsificação, papiloscopia.

• Keywords: MOFs, europium, anti-counterfeiting, fingerprinting.

• Abstract: Lanthanide-based metal-organic frameworks (MOFs) have shown notable optical properties and high stability, which make them suitable for security and forensic chemistry applications. In this work, the nanoscale MOF[Eu2(BDC)3(H2O)4]n​, passivated with polyvinylpyrrolidone (PVP), was synthesized by sonochemical crystallization under mild conditions, using a simple, fast, and low-cost route. The structure and crystalline purity of the material were confirmed by X-ray diffraction, revealing an isoreticular structure in relation to analogous systems reported in the literature. FTIR analyses showed the coordination of the BDC²⁻ ligand to the Eu³⁺ ion, while thermogravimetric studies proved thermal stability compatible with previously described europium MOFs. The scanning electron microscopy displayed a homogeneous and nanostructured morphology. The photoluminescent properties showed intense red emission, with characteristic transitions of Eu³⁺ and a chemical environment without an inversion center, in accordance with crystallographic data. The material exhibited excellent behavior as an anti-counterfeiting fluorescent ink, proving effective on different substrates, such as coated paper, white laid paper, opal laid paper, kraft paper, transparent plastic film, and yellow envelope paper. Furthermore, it proved useful as a powder for developing latent fingerprints, allowing clear visualization of dermatographic minutiae under UV light. The results consolidate the potential of the EuBDCPVP for security and forensic applications.