Volume 26, Issue 51 p. 11767-11775
Full Paper

Conversion from Heterometallic to Homometallic Metal–Organic Frameworks

Dr. Jeong Hwa Song

Dr. Jeong Hwa Song

Department of Chemistry, Sejong University, Seoul, 05006 Korea

These authors contributed equally to this work.

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Giseong Lee

Giseong Lee

Department of Chemistry, Korea University, Seoul, 02841 Korea

These authors contributed equally to this work.

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Jung Heum Yoon

Jung Heum Yoon

Department of Chemistry, Sejong University, Seoul, 05006 Korea

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Junyeon Jang

Junyeon Jang

Department of Chemistry, Sejong University, Seoul, 05006 Korea

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Doosan Choi

Doosan Choi

Department of Chemistry, Korea University, Seoul, 02841 Korea

Department of Chemistry, Sejong University, Seoul, 05006 Korea

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Heejun Yun

Heejun Yun

Department of Chemistry, Sejong University, Seoul, 05006 Korea

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Kangin Kwon

Kangin Kwon

Department of Chemistry, Korea University, Seoul, 02841 Korea

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Hojin Kim

Hojin Kim

Department of Chemistry, Korea University, Seoul, 02841 Korea

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Prof. Dr. Chang Seop Hong

Prof. Dr. Chang Seop Hong

Department of Chemistry, Korea University, Seoul, 02841 Korea

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Youngki Kim

Youngki Kim

Korea Testing & Research Institute, Gwacheon, 13810 Korea

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Prof. Dr. Hogyu Han

Corresponding Author

Prof. Dr. Hogyu Han

Department of Chemistry, Korea University, Seoul, 02841 Korea

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Dr. Kwang Soo Lim

Corresponding Author

Dr. Kwang Soo Lim

Korea Testing & Research Institute, Gwacheon, 13810 Korea

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Prof. Dr. Woo Ram Lee

Corresponding Author

Prof. Dr. Woo Ram Lee

School of Future Convergence, Department of Chemistry and Institute of, Applied Chemistry, Hallym University, Chuncheon, 24252 Korea

Department of Chemistry, Sejong University, Seoul, 05006 Korea

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First published: 24 December 2019
Citations: 3

Graphical Abstract

Two new heterometallic metal–organic frameworks (MOFs), LnZnTPO, and two homometallic MOFs, LnTPO (Ln=Eu or Tb; H3TPO=tris(4-carboxyphenyl)phosphine oxide) were synthesized, and their structures and properties were analyzed. Solvothermal immersion of LnZnTPO in Ln3+ solution resulted in the framework metal–ion exchange affording LnTPO (see figure).

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.

Conflict of interest

The authors declare no conflict of interest.