The 2:1 adducts of (benzoylmethylene)triphenylphosphorane with fumaric and terephthalic acids

Abstract

The molecular structure of the co-crystal, (I), of BPPY with fumaric acid. Displacement ellipsoids are drawn at the 50% probability level. The symmetry-generated atoms C28A, C27A, O2A, O3A and H2AA have been included for completeness [symmetry code: (A) 1 À x, 1 À y, 1 À z].

Two three-dimensional networks in the binary molecular adducts 4-methylimidazolium hydrogen terephthalate and bis(4-methylimidazolium) terephthalate

“…Terephthalic acid (H 2 TPA), a rod-like aromatic diacid, has often been used in the synthesis of metal-organic frameworks as a linker molecule (Serre et al, 2007;Mukherjee et al, 2004;Sun et al, 2000;Zakaria et al, 2001;Karanović et al, 2002;Damgaard Poulsen et al, 2006;Li et al, 1998). Recently, with the increase in interest in controlling the crystalline structures of organic-based solid-state materials, H 2 TPA is being increasingly employed in constructing supramolecular structures (Mei et al, 2007;Dale et al, 2004;Zhang & Chen, 2004;Lynch & Jones, 2004;Spencer et al, 2004;Devi & Muthiah, 2007). However, the experimental conditions employed (such as the solvent, temperature, crystallization method and counter-ions) can all have an important impact on the structure of the final assembly (She et al, 2008;Meng et al, 2007Meng et al, , 2008Childs et al, 2007;Díaz et al, 2006).…”

How good are the crystallisation methods for co-crystals? A comparative study of piroxicam

“…Childs and Hardcastle 57 found that one of the co-crystals has a 4 : 1 stoichiometry, which is a rather unusual ratio. There is a chance that terephthalic acid, if behaving like fumaric acid as a co-former as suggested by other results, 81 would show a comparable stoichiometry, and that the crystallisation conditions for this specific crystal form were not found in the present study. It thus is advisable to perform more crystallisations especially with varying component ratios, which is the scope of ongoing studies.…”

“…77,78 In other co-crystal studies, terephthalic acid was found to form co-crystals 79,80 and their crystal structure revealed that the packing is comparable to co-crystals formed with fumaric acid. 78,81 Like the phthalic acid analogues, fumaric acid was found to form two different co-crystal forms in this study. Childs and Hardcastle 57 found that one of the co-crystals has a 4 : 1 stoichiometry, which is a rather unusual ratio.…”

Bis(2-amino-4-methylpyridinium) terephthalate tetrahydrate

“…For background to the chemistry of substituted pyridines, see: Pozharski et al (1997); Katritzky et al (1996). For the applications of terephthalic acid, see: Serre et al (2007); Mukherjee et al (2004); Sun et al (2000); Lynch & Jones (2004); Spencer et al (2004); Devi & Muthiah (2007). For details of hydrogen bonding, see: Jeffrey & Saenger (1991); Jeffrey (1997); Scheiner (1997).…”

“…Terephthalic acid (H 2 TPA), a rod-like aromatic diacid, has often been used in the synthesis of metal-organic frameworks as a linker molecule (Serre et al, 2007;Mukherjee et al, 2004;Sun et al, 2000). Recently, with the increase in interest in controlling the crystalline structures of organic-based solid-state materials, H 2 TPA is being increasingly employed in constructing supramolecular structures (Lynch & Jones, 2004;Spencer et al, 2004;Devi & Muthiah, 2007). Since our aim is to study some interesting hydrogen-bonding interactions, the crystal structure of the title compound is presented here.…”