Synthesis and Characterization of Coordination Compound [Eu(µ2-OC2H5)(btfa)(NO3)(phen)]2phen with High Luminescence Efficiency

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2022-08, Vol.12 (16), p.2788
• Main Authors: Culeac, Ion P., Verlan, Victor I., Bordian, Olga T., Zubareva, Vera E., Iovu, Mihail S., Bulhac, Ion I., Siminel, Nichita A., Siminel, Anatolii V., Mihai, Geanina, Enachescu, Marius
• Format: Article
• Language: English
• Subjects: blue-light excitable; Caustic soda; Coordination compounds; dinuclear coordination compound; Efficiency; Emission spectra; Ethanol; Europium; europium(III); Hydrocarbons; Hydrogen; Lasers; Light; Luminescence; Molecular structure; Nitrates; Optoelectronics; Photoluminescence; Photons; quantum yield; Spectrum analysis
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12162788

A high-luminescent, blue-light excitable europium(III) coordination complex, [Eu(µ2-OC2H5)(btfa)(NO3)(phen)]2phen (1) {btfa = benzoyl trifluoroacetone, phen = 1,10-phenantroline}, has been synthesized and investigated. The complex was characterized by infrared (IR) and photoluminescence (PL) spectroscopy. The PL emission spectra of powder samples registered in a range of 10.7–300 K exhibit characteristic metal-centered luminescence bands, assigned to internal radiative transitions of the Eu3+ ion, 5D1→7Fj and 5D0→7Fj (j = 0–4). The high-resolution spectrum of the transition 5D0→7F0 shows that it consists of two narrow components, separated by 0.96 meV, which indicates the presence in the matrix of two different sites of the Eu3+ ion. The splitting pattern of 5D0→7Fj (j = 0–4) transitions indicates that europium ions are located in a low-symmetry environment. The absolute quantum yield and the sensitization efficiency were determined to be 49.2% and 89.3%, respectively. The complex can be excited with low-cost lasers at around 405 nm and is attractive for potential applications in optoelectronics and biochemistry.