Trimesic acid network

A Highly Guest-Selective Metal-Trimesic Acid Network... 

The magnets described in this work are among the very few two- or three-dimensional molecular structures with complete interlocking of independent infinite networks. Other examples are silver tricyanomethide [17], trimesic acid [18], dia-quabis(4,4 -bipyridine)zinc hexafluorosilicate [19], zinc bis(tricyanomethide) [20], and bis(l,2-di-(4-pyridyl)-ethylene-bis(thiocyanato)iron(H) [21]. Interlocking of rings in discrete supramolecular units is much more developed [22-25] and most of this book is devoted to this topic. 

The self complementary 8.59 may be regarded as the logical three-dimensional progression of the topological zero-, one- and two-dimensional points, chains and sheets formed by benzoic acid, tereph-thalic acid and trimesic acid (Section 7.4.1), shown schematically in Figure 8.77. Adamantane-1,3,5,7-tetracarboxylic acid (8.59) forms a diamondoid network with cavities so large that close packing can... 

Organic networks are also capable of exhibiting interpenetration. Figure 6 illustrates the threefold interpenetration that occurs in the cocrystal formed between trimesic acid (benzene-1,3,5-tricarboxylic acid) and bipy. This structure exhibits interpenetration in 2D to form a novel carpet-like architecture.54 The non-interpene-trated form of this compound has not yet been isolated. 

Recently Yaghi and co-workers reported a coordination network based on trimesic acid and Co(n) which retained its porous structure upon the removal of solvent molecules and selectively absorbs aromatic guests. Also, Fujita, Ogura and co-workers have demonstrated that cyanosilation of aldehydes can be performed in the microchaimels of a two-dimensional square material composed of cadmium(II) and 4,4 -bipytidine. From the examples described above, it is quite apparent that organic zeolites are more of a reality than a fantasy. What is the future that await these porous compounds with zeolitic behavior ... 

Heckl and co-workers [140] incorporated coronene molecules into a molecular network of trimesic acid molecules. Some of the coronene molecules apparently rotated and single ones could be removed with an STM tip operated at the liquid-solid interface. The authors report that coronone molecules alone do not self-organize in heptanoic acid on graphite - the support of the trimesic acid molecule network is necessary. 

Figure 4 Some hydrogen-bonding patterns in crystalline carboxylic acids. The dimer motif is used in terephthalic acid, trimesic acid and adamantane-l,3,5,7-tetracarboxylic acid to obtain networks of increasing dimensionality...

The dimer synthon formed by the carboxyl group has been used to assemble a variety of supermolecules due to its bidentate character which increases the strength of the interaction. For example, terephthalic acid (8) [39] and iso-phthalic acid (9) [40] form one dimensional tapes. Trimesic acid (2) with its threefold molecular symmetry forms a two dimensional hydrogen bonded sheet [41] and adamantane-l,3,5,7-tetracarboxylic acid (10) with its tetrahedrally disposed carboxy functionality forms a diamondoid network (Fig. 9) [42]. 

Another long-known example of 2D inclined interpenetration is the structure of trimesic acid (1,3,5-benzene-tricarboxylic acid). It contains hydrogen-bonded (6.3) sheets that interpenetrate such that each window of each sheet is penetrated by three other inclined sheets. It is also possible for more than two stacks of parallel sheets to show inclined interpenetration—the remarkable structure of Co2(azpy)3(N03)4-Me2CO-3H20 [a /73 =4,4 -azo/ zT-(pyridine)] contains four separate stacks of parallel (6,3) sheets that all interpenetrate at mutually inclined angles.Combinations of network and interpenetration topologies are also possible. Inclined interpenetration between (4,4) and (6.3) sheets has been reported,and... 

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