Structure, Volatility, and Luminescence of Phenanthroline Adducts with Lanthanide Tris-Dipivaloylmethanates

• Published in: Journal of structural chemistry 2020, Vol.61 (1), p.101-108
• Main Authors: Stabnikov, P. A., Urkasym kyzy, S., Trubin, S. V., Pervukhina, N. V., Korolkov, I. V., Berezin, A. S., Morozova, N. B.
• Format: Article
• Language: English
• Subjects: Adducts; Atomic; Atomic/Molecular Structure and Spectra; Chemistry; Chemistry and Materials Science; Crystal structure; Crystals; Dysprosium; Erbium; Gadolinium; Inorganic Chemistry; Luminescence; Melting points; Molecular; Optical and Plasma Physics; Physical Chemistry; Praseodymium; Solid State Physics; Volatility; Ytterbium
• ISSN: 0022-4766; 1573-8779
• DOI: 10.1134/S0022476620010114

A series of Ln(III) tris-dipivaloylmethanates with phenanthroline with the composition Ln(thd) 3 Phen (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) is synthesized. It is found that all adducts are isostructural with previously known La(thd) 3 Phen, Tb(thd) 3 Phen, and Dy(thd) 3 Phen complexes. Crystal structures of Sm(thd) 3 Phen ( I ) and Eu(thd) 3 Phen ( II ) complexes are determined at 150(2) K (space group P 1 ¯ , a = 10.8590(5) Å, b = 12.3049(6) Å, c = 18.4479(10) Å, α = 80.210(2)°, β = 87.499(2)°, γ = 68.799(2)°, V = 2264.3(2) Å 3 , Z = 2; space group P 1 ¯ , a = 10.8788(3) Å, b = 12.3009(3) Å, c = 18.4309(5) Å, α = 80.3644(9)°, β = 87.5440(10)°, γ = 68.7376(8)°, V = 2265.7(1) Å 3 , Z = 2 respectively). Crystal structures of I and II consist of isolated Ln(thd) 3 Phen molecules (Ln = Sm(III), Eu(III)). The highest luminescence quantum yields for this series of adducts are established for Eu(thd) 3 Phen (10%) and Sm(thd) 3 Phen (1.5%). Thermogravimetric studies show that the volatility of adducts weakly increases from Pr(thd) 3 Phen to Yb(thd) 3 Phen. Their melting points are close to the reported data.