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

Functional Organic Zeolite Analogues 139
22
23
Fig. 7. 12-Annulene-like motif formed by 22◊ AgOTf. The counteranion is not shown for clarity.
The sheets (23) are layered to form intersheet channels
and 3.55 Å in the porphyrin (3 ◊ 2Cd(NO 3) 2◊ 8.6H 2O), bipyridine [2(18) ◊
Cd(NO 3) 2◊ 2(o-C 6H 4Br 2)] and tricyano (20 ◊ AgOTf) systems, respectively.
Trimesic (benzene-1,3,5-tricarboxylic) acid (24) forms a hydrogen-bonded
hexagonal motif 25 with a 14 Å-hole (Fig. 8). It stacks in the vertical direction as
above.An extensive interpenetration of the networks, however, leaves no channel
capable of guest binding [46] (see also the article by R.E. Meléndez and A.D.
Hamilton in this volume). Such an interpenetration or polycatenation can be
elegantly prevented by building a covalently-closed macrocyclic ring 26 with a
9 Å-hole [47] or an open dimer 27 [48]. The use of a bulky amine as a spacer also
leads to a non-interpenetrating and hence guest-binding motif 28 with a 12.7 Åhole
[49]. The cyclohexyl groups in the amine partially cover the guest-binding
cavity, thereby inhibiting interpenetration of the networks.
Anthracene-diresorcinol derivative 29 [50–52] is an in-plane tetraol, having
an inclined or orthogonal anthracene spacer (Fig. 9). It forms a hydrogen-bon-