Cation–anion interactions involving hydrogen bonds: Syntheses and crystal structures study of hexafluorotitanate(IV) salts with pyridine and methyl substituted pyridines

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• 作者：Andrej Pevec ; ^a ; ^{andrej.pevec@fkkt.uni-lj.si} ; Martina Tekavec^a ; Alojz Demš ; ar^a
• 关键词：Hexafluorotitanate ; Hydrogen bond ; X-ray crystal structure
• 刊名：Polyhedron
• 出版年：2011
• 出版时间：11 March 2011
• 年：2011
• 卷：30
• 期：4
• 页码：549-555
• 全文大小：903 K

文摘

Fluorotitanates (LH)₂[TiF₆]·nH₂O (1: R = pyridine, n = 1, 2: R = 2-picoline, n = 2, 3: R = 2,6-lutidine, n = 0, 4: R = 2,4,6-collidine, n = 0) and (LH)[TiF₅(H₂O)] (3a: L = 2,6-lutidine) have been synthesized by the reaction of pyridine or corresponding methyl substituted pyridines and titanium dioxide dissolved in hydrofluoric acid. The crystal structures of ionic compounds 1, 2, 3, 3a and 4 have been determined by single-crystal X-ray diffraction analysis. The hydrogen bonding led to the formation of discrete (LH)₂[TiF₆] units (4), chains (1–3), and layers (3a). The additional π–π interactions present in 1, 2, and 4 results in chain structures of 1 and 4 and in a layer structure of 2. The [TiF₆]²⁻ and [TiF₅(H₂O)]⁻ anions were observed by ¹⁹F NMR spectroscopy in aqueous solutions of 1, 2, 3, 3a and 4.