Diamondoid structures

Table 8.6 Diamondoid structures formed by modular self-assembly of 8.60 with a variety of hydrogen bond acceptors. The inter-cube distance is the distance from one molecule of 8.60 to the next and represents the diamondoid edge length.

Some crystalline compounds that exhibit diamondoid structures are listed in Table 20.4.1. The rod linking a pair of nodes can be either linear or nonlinear. 

Figure 12.1. (cont.) Aromatic carboxylic acids linked via synthon I (e) 5 forms a three-dimensional diamondoid structure. 

The use of transition metals or transition metal clusters to act as nodes for the modular self-assembly of diamondoid networks that are sustained by coordinate covalent bonds is also well established. Such architectures are of more than aesthetic appeal. Indeed, such structures have resulted in a class of compound with very interesting bulk and functional properties. Metal-organic diamondoid structures in which the spacer moiety has no center of inversion are predisposed to generate polar networks since there would not be any inherent center of inversion. Pyridine-4-carboxylic acid is such a ligand and bis(isonicotinato)zinc exists as a three-fold diamondoid structure that is thermally stable and inherently polar.33... 

The tendency of 2-pyridones to form hydrogen-bonded dimers (Fig. 8c) was exploited by Wuest and co-workers in the formation of diamondoid structures based on rigid tetrapyridones such as 9 [17]. Crystallisation of 9 from butyric acid/methanol/hexane gave the anticipated diamondoid network, which is sevenfold interpenetrating [75] and contains butyric acid molecules present in the pores. 

Figure 8.75 (a) Diamondoid networks and their components. Normal ice Ih has a hexagonal arrangement but two diamondoid polymorphs are known, (b) twofold interpenetration of adamantoid cages in a diamondoid structure (reproduced by permission of The Royal Society of Chemistry). 

Figure 13 Coordination environment (a) and diamondoid structure (b) of [ Cd[4-(4-pyridyl) benzoate]2 H20] (reproduced by permission of the American Chemical Society from Chem. Mater.,...

Lin W, Ma L, Evans OR (2000) NLO-active zinc(II) and cadmium(ll) coradination netwraks with 8-fold diamondoid structures. Chtm Commun 2263-2264... 

Figure 1 Archetypal coordination polymer or metal-organic framework structures (a) diamondoid structure of [Cu(tetra-(4-cyanophenyl)methane)]+ (b) structure of [Zn40(bdc)j], MOF-5...

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