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198 Topics in Current Chemistry Editorial Board: A. de Meijere KN ...

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140 Y. Aoyama<br />

24<br />

<strong>de</strong>d (O-H◊◊◊O-H) 2D net 30. There is no <strong>in</strong>terpenetration of the nets. Their layer<br />

structure is somehow different from the previous cases. The presence of the<br />

orthogonal spacers stick<strong>in</strong>g out of the sheet prevents close pack<strong>in</strong>g thereof.<br />

Actually, the sheets are layered <strong>in</strong> a staggered manner (31 for the top view of<br />

neighbour<strong>in</strong>g sheets) with an <strong>in</strong>tersheet distance of ~7 Å. This gives rise to a<br />

“<strong>de</strong>pth” of the big cavities (~ 10 Å height for the free space, referr<strong>in</strong>g to 30),<br />

which <strong>in</strong>corporate two guest molecules (ketone or ester), antiparallel with each<br />

25<br />

28<br />

26 27<br />

Fig. 8. Hexagonal motifs formed by 24 and its covalently-l<strong>in</strong>ked <strong>de</strong>rivatives<br />

◊◊◊◊<br />

◊◊◊◊◊◊<br />

…<br />

…<br />

◊◊◊◊◊<br />

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