Acta Crystallographica Section B

Structural Science, Crystal Engineering and Materials

Volume 69, Part 6 (December 2013)


research papers



Acta Cryst. (2013). B69, 603-612    [ doi:10.1107/S2052519213025980 ]

Alkali metal complexes of 6-methyl-2-pyridone: simple formulae, but not so simple structures

W. Clegg and D. M. Tooke

Abstract: 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)(H2O)2 [(1), M = Na; (2), M = K], M(mhp)(H2O) [(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 ([mu]2) by each solvent molecule in (1), (5) and (6), while (2) contains both [mu]2 and [mu]3 triple bridges, and (3) and (4) display highly unusual [mu]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.

Keywords: alkali metals; bridging ligands; O-donor ligands; hydrogen bonds.


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Structure factor file (CIF format) (107.4 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt34_1sup2.hkl ]
Contains datablock dmt34


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Structure factor file (CIF format) (112.8 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt39_2sup3.hkl ]
Contains datablock dmt39


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Structure factor file (CIF format) (102.1 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt45_3sup4.hkl ]
Contains datablock dmt45


hkldisplay filedownload file

Structure factor file (CIF format) (105.2 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt28_4sup5.hkl ]
Contains datablock dmt28


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Structure factor file (CIF format) (122.9 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt49_5sup6.hkl ]
Contains datablock dmt49


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Structure factor file (CIF format) (274.9 kbytes)
[ doi:10.1107/S2052519213025980/ps5030dmt29_6sup7.hkl ]
Contains datablock dmt29


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