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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Alkali metal complexes of 6-methyl-2-pyridone: simple formulae, but not so simple structures
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Alkali metal complexes of 6-methyl-2-pyridone: simple formulae, but not so simple structures

机译:6-甲基-2-吡啶酮的碱金属配合物:分子式简单,但结构不那么简单

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摘要

Reaction of 6-methyl-2-pyridone (Hmhp) with Na or K metal, or with Rb or Cs 2-ethylhexoxide, in an appropriate single or mixed solvent, yields a series of solvated polymeric complexes with the empirical formulae M(mhp)(H20)2 [(1),M = Na; (2), M = K], M(mhp)(H20) [(3), M = Rb; (4),M = Cs] and Cs(mhp)(ROH) [(5),R = Me; (6), R = Et]. All of the products have been crystallographically characterized and show sheet polymeric structures, except for a double-chain structure for (2). In all of the structures, mhp- and solvent molecules function as bridging ligands; two metal ions are bridged (μ_2) by each solvent molecule in (1), (5) and (6), while (2) contains both μ_2 and μ_3 triple bridges, and (3) and (4) display highly unusual μ_4 quadruple bridging of metal ions by water molecules. The pyridonate O atom bridges two or three metal ions in each case. Nitrogen is also involved in coordination to the heavier metals; it bonds to a single ion in (3) and (4), but has an almost unprecedented bridging role in (5) and (6). As a result of the extensive bridging by ligands, coordination numbers between 6 and 8 are achieved for the metal ions. In each structure, all solvent OH groups form hydrogen bonds to pyridonate O and, in some cases, N atoms. With one exception, these are the first reported pyridonate complexes of the alkali metals Na-Cs that do not also include transition metals.
机译:在适当的单一或混合溶剂中,使6-甲基-2-吡啶酮(Hmhp)与Na或K金属或与Rb或Cs 2-乙基己氧化物反应,生成一系列具有经验式M(mhp)的溶剂化聚合物配合物(H20)2 [(1),M = Na; (2),M = K],M(mhp)(H 2 O)[(3),M = Rb; (4),M = Cs]和Cs(mhp)(ROH)[(5),R = Me; (6),R = Et]。除(2)的双链结构外,所有产物均经晶体学表征并显示出片状聚合物结构。在所有结构中,mhp-和溶剂分子起桥连配体的作用; (1),(5)和(6)中的每个溶剂分子将两个金属离子桥接(μ_2),而(2)同时包含μ_2和μ_3三重桥,并且(3)和(4)显示非常不寻常的μ_4四重通过水分子桥接金属离子。吡啶氧原子分别桥接两个或三个金属离子。氮还参与与重金属的配位。它在(3)和(4)中与单个离子键合,但在(5)和(6)中具有几乎前所未有的桥连作用。通过配体的广泛桥接,金属离子的配位数在6至8之间。在每个结构中,所有溶剂OH基团都与吡啶酸酯O形成氢键,有时还与N原子形成氢键。除一个例外,这些是碱金属Na-Cs的首次报道的吡啶酸盐络合物,其中不包括过渡金属。

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