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Conversion from Heterometallic to Homometallic Metal–Organic Frameworks
Author(s) -
Song Jeong Hwa,
Lee Giseong,
Yoon Jung Heum,
Jang Junyeon,
Choi Doosan,
Yun Heejun,
Kwon Kangin,
Kim Hojin,
Hong Chang Seop,
Kim Youngki,
Han Hogyu,
Lim Kwang Soo,
Lee Woo Ram
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904866
Subject(s) - metal organic framework , nanotechnology , materials science , metal , chemistry , metallurgy , organic chemistry , adsorption
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 ; H 3 TPO=tris(4‐carboxyphenyl)phosphine oxide) were synthesized, and their structures and properties were analyzed. They were prepared by solvothermal reaction of the C 3 ‐symmetric ligand H 3 TPO with the corresponding metal ion(s) (a mixture of Ln 3+ and Zn 2+ for 1 and 2 , and Ln 3+ 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 Tb 3+ and Eu 3+ 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.