Structures and luminescent properties of two heterotrimetallic Ln(III)–Sr(II)–K(I) complexes

Abstract

Eu(III)–Sr(II)–K(I) and Tb(III)–Sr(II)–K(I) heterotrimetallic metal-organic frameworks with 2,4,6-pyridinetricarboxylic acid have been synthesized under hydrothermal conditions. The complexes are isomorphic and both in triclinic space group P-1. The ligands bond with three metal ions with two coordination modes. One connects seven metal ions and the other connects eight metal ions. IR spectra, thermal analysis, and photoluminescent properties have been studied. The results display strong characteristic emissions of Eu(III) or Tb(III) ions with excitation of ultraviolet radiation.

Graphical Abstract

Keywords:

• Heterometallic
• Luminescence
• Lanthanide
• Strontium
• Potassium

Additional information

Funding

Funding. This work was supported by the Key Scientific and Technological Project of Henan province [grant number 132102210263].