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A Zeolite‐Like Zinc Phosphonocarboxylate Framework and Its Transformation into Two‐ and Three‐Dimensional Structures
Author(s) -
Chen Zhenxia,
Zhou Yaming,
Weng Linhong,
Yuan Chao,
Zhao Dongyuan
Publication year - 2007
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200700209
Subject(s) - sbus , zinc , trimer , zeolite , isophthalic acid , sorption , chemistry , methanol , dimethylamine , solvothermal synthesis , crystallography , inorganic chemistry , materials science , adsorption , metal organic framework , organic chemistry , dimer , catalysis , polyester , terephthalic acid
Three zinc phosphonocarboxylates, Zn 2 (pbc) 2 ⋅Hdma⋅H 3 O⋅2H 2 O ( 1 ), Zn(pbc)⋅Hdma ( 2 ), and Zn 4.5 (pbc) 3 (OH)(H 2 O) 0.5 ⋅Hdma ( 3 ) (H 3 pbc=4‐phosphonobenzoic acid, dma=dimethylamine) were synthesized by the mixed solvothermal reaction of Zn(Ac) 2 ⋅2H 2 O and 4‐phosphonobenzoic acid in N , N ‐dimethylformamide (DMF) and water. The zigzag and ladderlike chains completely constructed by triply fused 4‐membered rings (denoted SBU‐1) are linked by the organic moieties to form the 3D zeolite‐like structure 1 and the layered structure 2 , respectively. As for structure 3 , a new second building unit (SBU‐2) formed by the inset of the [Zn 3 O 12 ] trimer into the 4‐membered ring as well as SBU‐1 is observed. The connections between the two types of SBUs lead to a “zinc phosphate” layer, which is linked by the organic groups to generate a 3D pillar‐layered structure. Both solution‐mediated and solid‐state transformations of 1 to 2 and 3 were observed. A possible mechanism for the transformation is proposed. Gas sorption studies show that 1 has accessible pores for methanol and water and exhibits size selectivity for alcohols.