Organic-inorganic hybrid tetrachlorocadmates as promising fluorescent agents for cross-linked polyurethanes: synthesis, crystal structures and extended performance analysis

Olga Yu Vassilyeva, Elena A. Buvaylo, Yevheniia V. Lobko, Rostyslav P. Linnik, Vladimir N. Kokozay, Brian W. Skelton

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The aim of this work is to apply organic-inorganic hybrid salts made of imidazo[1,5-a]pyridinium-based cations and halometallate anions as fluorescent agents to modify cross-linked polyurethane (CPU) for the creation of flexible photoluminescent films. The use of ionic compounds ensures excellent dispersion of the luminescent components in the polymer matrix and prevents solid-state quenching. The absence of phase segregation makes it possible to fabricate uniformly luminescent films with a large area. To this, new tetrachlorocadmate salts [L]2[CdCl4] (1) and [L′]2[CdCl4] (2), where L+is 2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridinium and [L′]+is 2-methylimidazo[1,5-a]pyridinium cations, have been prepared and characterized by IR, NMR, UV-Vis spectroscopy and single crystal X-ray diffraction. The organic cations resulted from the oxidative cyclization-condensation involving CH3NH2·HCl and 2-pyridinecarbaldehyde in methanol (1), and formaldehyde, CH3NH2·HCl and 2-pyridinecarbaldehyde in an aqueous media (2). In the crystal of1, loosely packed tetrahedral cations and π-π stacked anions are arranged in separate columns parallel to thea-axis. The pseudo-layered structure of2is built of the organic and inorganic layers alternating along theaaxis. The adjacent CdCl42−anions in the inorganic layer show no connectivity. The organic-inorganic hybrids1and2were immobilizedin situin the cross-linked polyurethane in low content (1 wt%). The photoluminescent properties of1and2in the solid state and in the polymer films were investigated. The semi-transparent CPU films, that remain stable for months, retain the photoluminescent ability of both hybrids in the blue region with a prominent red shift in their emission.

Original languageEnglish
Pages (from-to)7713-7722
Number of pages10
JournalRSC Advances
Volume11
Issue number13
DOIs
Publication statusPublished - 17 Feb 2021

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