Preparation, Structure and Properties of [Tb(HIA)2(IA)(H2O)2(HgCl2)]n(nHgCl4)·3nH2O (IA = Isonicotinate Anion)


A novel 4f-5d compound [Tb(HIA)2(IA)(H2O)2(HgCl2)]n(nHgCl4)·3nH2O (1, IA = isonicotinate anion) has been prepared and structurally determined by X-ray diffraction. Complex 1 crystallizes in the P21/c space group of the monoclinic system with a = 9.6875(3), b = 19.8318(7), c = 17.0899(5) Å, β = 101.609(3)º, V = 3216.16(18) Å3, C18H24Cl6Hg2N3O11Tb, Mr = 1231.20, Z = 4, Dc = 2.543 g/cm3, μ(Mo) = 12.251 mm–1 and F(000) = 2272. The crystal structure of complex 1 is characterized by a two-dimensional (2-D) layer-like structure. The photoluminescence measurements with solid-state samples reveal that it exhibits a yellowish green emission with the emission bands locating at 490, 546, 586 and 620 nm, respectively. The photoluminescence emission bands are resulted from the characteristic emission of the 4f electrons intrashell transition of the 5D4 → 7FJ (J = 6, 5, 4, 3) of the Tb3+ ion. The energy transfer mechanism is explained by using the energy level diagram of the Tb3+ ion and isonicotinic acid ligand. Complex 1 exhibits CIE chromaticity coordinates being of 0.3823 and 0.5141. A solid-state diffuse reflectance measurement shows that the complex possesses a wide optical band gap of 2.67 eV.

Graphic Abstract

A novel 4f-5d compound featuring a 2-D layer-like structure has been reported for the crystal structure and properties.

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I thank the financial support of the NSF of China (21361013), Jiangxi Provincial Department of Education’s Item of Science and Technology (GJJ170637), and the open foundation (20180008) of the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences.

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Correspondence to Wen-Tong Chen.

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Dedicated to Professor Jin-Shun Huang on the occasion of his 80th birthday.

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Chen, WT. Preparation, Structure and Properties of [Tb(HIA)2(IA)(H2O)2(HgCl2)]n(nHgCl4)·3nH2O (IA = Isonicotinate Anion). J Chem Crystallogr 51, 116–123 (2021).

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  • CIE
  • Hydrothermal reaction
  • Mercury
  • Photoluminescence
  • Terbium