From condensed lanthanide coordination solids to microporous frameworks having accessible metal sites
The combination of terbium nitrate and 1,4-benzenedicarboxylic acid (H{sub 2}BCD) in the presence of triethylamine yields the compound Tb{sub 2}(BCD){sub 3} {center{underscore}dot} (H{sub 2}O){sub 4}, which has an extended nonporous structure constructed from copolymerized BCD and Tb(III) units. The multidentate functionality of BDC and the tendency of Tb to have a high coordination number has allowed water to act as a terminal ligand to Tb in the structure. Upon thermally liberating the water ligands, a microporous material, Tb{sub 2}(BDC){sub 3}, is achieved, which has extended 1-D channels and the same framework structure as that of the as-synthesized solid as evidence by XRPD. Water sorption isotherm data proves that Tb{sub 2}(BDC){sub 3} has permanent microporosity, and points to the presence of accessible metal sites within the pores, which also allows the sorption of ammonia to give Tb{sub 2}(BDC){sub 3} {center{underscore}dot} (NHP{sub 3}){sub 4}. Luminescence lifetime measurements confirm that resorbed water and sorbed ammonia are bound to Tb and that they give distinctly different decay constants.
- Research Organization:
- Arizona State Univ., Tempe, AZ (US)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE
- DOE Contract Number:
- FG03-98ER14903
- OSTI ID:
- 20013127
- Journal Information:
- Journal of the American Chemical Society, Vol. 121, Issue 8; Other Information: PBD: 3 Mar 1999; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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