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[Li 2 (tF‐BDC)(DMF) 2 ]: A New Alkali Metal Salt of Tetrafluoroterephthalic Acid (H 2 tF‐BDC)
Author(s) -
Dolfus Benedikt,
Ruschewitz Uwe
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201400006
Subject(s) - alkali metal , chemistry , crystallography , endothermic process , thermal decomposition , molecule , solvent , lithium (medication) , thermal stability , van der waals force , salt (chemistry) , crystal structure , inorganic chemistry , adsorption , organic chemistry , medicine , endocrinology
The DMF solvate of lithium tetrafluoroterephthalate [Li 2 (tF‐BDC)(DMF) 2 ] (H 2 tF‐BDC = tetrafluoroterephthalic acid) was synthesized and structurally characterized from X‐ray single crystal data ( Pbcn , Z = 8). Li + (CN = 4) is coordinated tetrahedrally by four oxygen atoms of three different tF‐BDC 2– linkers and one DMF molecule. The LiO 4 tetrahedra are connected by common vertices to chains, which are bridged by tF‐BDC 2– linkers to form a 2D polymeric unit. The DMF molecules are oriented perpendicular to these polymeric sheets, which are stacked along [100] in an AB fashion and held together by weak van der Waals interactions. Single crystals of [Li 2 (tF‐BDC)(DMF) 2 ] were synthesized by precipitation from an ethanol/DMF solvent mixture, but single‐phase samples were only obtained by a mechanochemical approach starting from lithium acetate and H 2 tF‐BDC by adding DMF. The thermal stability of [Li 2 (tF‐BDC)(DMF) 2 ] was investigated by DTA/TG measurements. The (endothermic) decomposition starts at 170 °C and is followed by a second exothermic decomposition at approx. 300 °C. The weight losses are in good agreement with a release of DMF and CO 2 . LiF is identified in the residue after heating at 500 °C.