Ca-Tetrafluorophthalate and Sr-isophthalate: mechanochemical synthesis and characterization in comparison with other Ca-and Sr-coordination polymers. Issue 16 (10th April 2018)

• Record Type: Journal Article
• Authors: Al-Terkawi, Abdal-Azim; Scholz, Gudrun; Emmerling, Franziska; Kemnitz, Erhard
• Is Part Of: Dalton transactions. Volume 47:Issue 16(2018)
• Page Start: 5743
• Page End: 5754
• Publication Date: 2018-04-10
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt00488a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Ca-tetrafluorophthalate and Sr-isophthalate were obtained by milling. Ca- and Sr-CPs based on tetrafluorobenzene-dicarboxylic acids and their fluorine-free analogs are compared. Abstract : New Ca- and Sr-based coordination polymers (CPs) were mechanochemically synthesized by milling metal hydroxide samples (M = Ca, Sr) with tetrafluorophthalic acid (H2 o BDC-F4 ) and isophthalic acid (H2 m BDC). [Ca( o BDC-F4 )(H2 O)2 ] (1 ) exhibits a small surface area which is slightly increased after removing the crystal water. On the other hand, the hydrated sample of the nonfluorinated [Sr( m BDC)(H2 O)3.4 ] (2 ) reveals a small BET surface area which remains unchanged even after the release of crystal water via thermal treatment. The new compounds1 and2 are similar to their Sr- and Ca-analogs, respectively. These findings are confirmed by thermal analysis, MAS NMR, and ATR-IR measurements, in addition to the Le Bail refinements for the measured powder X-ray data of1 and2 . Ca- and Sr-CPs based on perfluorinated dicarboxylic systems and their nonfluorinated analogs diverse in structural and chemical properties depending on the geometries of the organic linkers and the presence of fluorine atoms. The fluorinations of organic ligands lead to the formation of fluorinated CPs with higher dimensionalities compared to their nonfluorinated counterparts. Conversely, the thermal stabilities of the latter are higher than those of the fluorinated CPs.