Conversion from Heterometallic to Homometallic Metal–Organic Frameworks

Jeong Hwa Song, Giseong Lee, Jung Heum Yoon, Junyeon Jang, Doosan Choi, Heejun Yun, Kangin Kwon, Hojin Kim, Chang Seop Hong, Youngki Kim, Hogyu Han, Kwang Soo Lim, Woo Ram Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Two new heterometallic metal–organic frameworks (MOFs), LnZnTPO 1 and 2, and two homometallic MOFs, LnTPO 3 and 4 (Ln=Eu for 1 and 3, and Tb for 2 and 4; H3TPO=tris(4-carboxyphenyl)phosphine oxide) were synthesized, and their structures and properties were analyzed. They were prepared by solvothermal reaction of the C3-symmetric ligand H3TPO with the corresponding metal ion(s) (a mixture of Ln3+ and Zn2+ for 1 and 2, and Ln3+ alone for 3 and 4). Single-crystal XRD (SXRD) analysis revealed that 1 and 3 are isostructural to 2 and 4, respectively. TGA showed that the framework is thermally stable up to about 400 °C for 1 and 2, and about 450 °C for 3 and 4. PXRD analysis showed their pore-structure distortions without noticeable framework–structure changes during drying processes. The shapes of gas sorption isotherms for 1 and 3 are almost identical to those for 2 and 4, respectively. Solvothermal immersion of 1 and 2 in Tb3+ and Eu3+ solutions resulted in the framework metal-ion exchange affording 4 and 3, respectively, as confirmed by photoluminescence (PL), PXRD, IR, inductively coupled plasma atomic emission spectroscopy (ICP-AES), and energy-dispersive X-ray (EDX) analyses.

Original languageEnglish
Pages (from-to)11767-11775
Number of pages9
JournalChemistry - A European Journal
Volume26
Issue number51
DOIs
Publication statusPublished - 2020 Sep 10

Keywords

  • conversion
  • heterometallic complexes
  • lanthanide metals
  • metal–organic frameworks
  • photoluminesence

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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