Trimesic acid, structure

Potential-induced phase transition of trimesic acid on Au(lll) electrode has been studied using in situ STM and CV [325]. In cyclic voltammograms, a pair of peaks was formed, which was ascribed to the structural transformation. On the basis of high-resolution STM images in 0.1 M HCIO4, it has been proposed that trimesic acid molecules assume flat-lying and vertical orientations at 0.25 V and 0.85 V, respectively. Both orientations coexisted at 0.65 V. 

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. 

Herbstein, F. H., Marsh, R. E., Crystal-Structures of Trimesic acid, its hydrates and complexes. 2. trimesic acid monohy-drate-2/9 picric acid and trimesic acid 5/6 hydrate. Acta Crystallogr. Sect. B-Struct. Commun. 1977, 33, 2358-2367. 

Herbstein, F. H., Structural parsimony and structural variety among inclusion complexes (with particular reference to the inclusion-compounds of trimesic acid, N-(para-tolyl)-tetrachlorophthalimide, and the Heilbron complexes). Top. Curr. Chem. 1987,140, 107-139. 

If a bulky hydrophobic group is introduced at the 5-position of isophthalic acid, a cyclic hexamer (rosette) is generated. In the crystal structure of trimesic acid, the voids are filled through interpenetration of two honeycomb... 

The complex between melamine and cyanuric acid (1 1) was reported in the literature in the late 1970s, but it was only in the early 1990s that the contributions from Whitesides and the concept of self-assembly popularized these systems [45]. Whitesides and co-workers reported the formation of tapes (Fig. 11.11), crinkled tapes and cyclic hexamers (rosettes) formed between barbituric acid and N,N -bis(p-substituted phenyl)melamine [46], In this they effectively blocked one face of melamine and, by manipulating substituents at the para position, different structures were obtained. Whiteside s putative suggestion that melamine/cyanuric acid formed an extended array (Fig. 11.12) was confirmed recently by Rao et al. with the crystal structure [47]. Hamilton and coworkers reported the crystal structure of a 5-substituted isophthalic acid derivative, which forms a cyclic aggregate held together with six pairs of hydrogen bonds, which in a way resembles the trimesic acid (Fig. 11.13) [48]. 

Duchamp, D. J. and Marsh, R. E. (1969). The crystal structure of trimesic acid (benzene-1,3,5-tricarboxylic acid). Acta Crystallogr. B25, 5. 

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. 

Figure 9. Trimesic acid isooctane, an organic open framework structure.

The archetypal self-complementary supramolecular synthons are carboxylic acid dimers, which form i (8) rings (Fig. la). Extension from the discrete zerodimensional dimer into one-, two- and three-dimensional structures can be facilitated by the incorporation of more than one carboxylic acid group into a molecule. Hence simple dicarboxylic acids such as terephthalic acid and isophthalic acid typically exhibit tape structures whereas tricarboxylic acids such as trimesic acid form sheet structures (Fig. 2). 

Fig. 2 a The linear tape structure of terephthalic acid, b The zigzag tape structure of isophthalic acid, c The chicken wire sheet structure of trimesic acid [29]... 

Trimesic acid 5-Methyl-2-pyridone Structure of a new cocrystal product generated by solid-state grinding of the methanol solvate cocrystal [52]... 

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 ... 

Thus the blue inclusion complex becomes visible only when all the hydrogen sulfite has been consumed. According to studies by / . C. Teitelbaum, S. L. Ruby and T. ]. Marks the blue inclusion compound consists of the amylose component of the starch and the polyhalogenide anion Is", this was established by comparing the Raman and I Mofibauer spectra of the blue-black amylose-iodine complex with those of the adduct between trimesic acid hydrate and H Is , the structure of which is known (see figures). 

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