Benzene tricarboxylic acid

Table 5.1 presents some values for the intrinsic binding constants, and also pair and triplet correlations for benzoic acid, benzene dicarboxylic acids, and benzene tricarboxylic acids. 

Before speculating on the origin of the nonaddivity in the tricarboxylic acid, we note that the pair correlation in the cyclohexane-triamine is much stronger than the corresponding pair correlation in benzene-tricarboxylic acid—probably due to the shorter distances between the protons in the former. Furthermore, the nonaddi-... 

Another example is the adsorption of prochiral 1,2,4-benzene tricarboxylic acid on Cu(100). As determined via X-ray absorption studies, this molecule has a tilted local geometry on the surface. The adsorbate complex is therefore chiral [70]. The long range ordered adlattice, however, has p(3 x 3) periodicity i.e., the molecules are strictly aligned by the quadratic substrate mesh. 

Still and Yoon [70] synthetized an A4B6 cyclo-oligomer from 1,3,5-benzene tricarboxylic acid (A) and (R,R)-l,2-diaminocyclohexane (B). This synthesis yielded two isomers with tetrahedral or D2 symmetry. Further studies proved the capability of the Da-symmetrical isomer to recognize selectively L-amino acids (70-90% ee), and to discriminate between different side chains of amino acids according to their size (phenyl > benzyl, ethyl > methyl) [71]. 

Tbe next mejor comasereial success was the family of composite membranes. They feature a very thin RG membrane on a suitable substrate, usually a UF membrane. Most of the RO composite membranes are polyamide cnatings in which the separating layer is produced by interfacial polymerization of a diamine and a multibasic acid chloride. The most snecessfol recent memhrane is based on an inteifacial polymer of 1,3-diamino benzene and 1,3,5-benzene tricarboxylic acid chloride coated on a polysulfone membrane substrate. 

ADK CIZER C-8 1,2,4-Benzenetricarboxylic acid, trioctyl ester Benzene tricarboxylic acid, trioctyl ester Diplast TM Diplast TM8 EINECS 201-877-4 HSDB 5263 JayBex TOTM Kodaflex TOTM Nuopiaz 6959 PX 338 TOTM Tri (2-ethylhexyl) trimellitate Tri-n-octyl trimellitate Trimex N 08 Trioctyl trimellitate Nuopiaz TOTM Palatinol TOTM Plasthall TOTM PX-338 Staflex TOTM Uniflex TOTM. Plasticizer Solid d = 0.989 bp = 414°. Exxon ExxonMobil Chem. Co. 

Herbstein EH (1996) 1,3,5-Benzene-tricarboxylic acid. In Atwood JL MacNicol DD, VOgtle F, Lehn JM (eds) Comprehensive Supramolecular Chemistry, Vol 6. Pergamon, New York, p 61... 

An unsuccessful attempt to obtain this formula was made by substituting a certain amount of the terei thalic acid with trimesinic acid (13,5-benzene tricarboxylic acid) or by using carboxylated compounds having higher acidity due to habgen atoms present in the a-position with respect to the carboxylic groups ... 

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... 

As an illustration of this stmctural diversity one can consider the five Er +-containing coordination polymers which are reported in table 2. All five can be obtained in aqueous media by reacting an Er + salt with the sodium salt of 1,3,5-benzene-tricarboxylic acid (Daiguebonne et al., 2000b). As can be seen in fig. 6, where the molecular motifs of these five compounds are reported, despite their similar chenucal formulae they present very different stmctural types. 

Another noticeable example of an MOF constructed from a polytopic carboxylic acid and the binuclear metal-carboxylate paddlewheel-like cluster MBB, equivalent to a square planar SBU, is the one commonly referred to as HKUST-1 MOF, with the general formula [Cu3(TMA)2 (H20)3] where TMA denotes trimesic acid (1,3,5-benzene-tricarboxylic acid) (Figure 13, ). The MBB is defined by four carboxylate ions coordinating two Cu(II) ions in a paddlewheel-like structure with four points of extension defining a square-planar SBU. The authors reported the capability of exchanging the axial water molecules coordinated to the Cu(II) paddlewheel, postsynthetically, with pyridine molecules, opening the door for further investigations toward the viability of preferential sorption of small molecules and/or catalysis on coordinatively unsaturated metal centers. 

For the preparation of the novel starburst molecules, different core molecules have been used 1,3,5-benzene tricarboxylic acid chloride, l,3,5-tris(4-benzoyl)benzene, 1,3,5-triethynylbenzene, and 4,4, 4"trihydroxytriphenylamine. 

By using IR, Shafizadeh and co-workers have identified phthalic (1,2-benzene dicar-boxylic acid), isophthalic (1, 3), hemimellitic (1,2, 3), trimellitic (1, 2,4), prehnitic (1, 2,3,4), mellophanic (1,2,3,5), pyromellitic (1,2,4,5), benzene penta and hexa carboxylic acids [32]. Hemimellitic and trimellitic acids were formed approximately at 2 3 ratio and prehnitic, mellophanic and pyromellitic acid approximately at 2 1 1 ratio. At the lower HTTs, in addition to the above compounds, lower amounts of monohydroxy benzene dicarboxylic acid, monohydroxy benzene tricarboxylic acid, and monohydroxy benzene tetracarboxylic acid have been detected, as well. 

Finally, MOFs have been recently reported for Pechmann reaction specifically Cu3(BTC)2 and Fe(BTC) (where BTC is benzene tricarboxylic acid) were investigated in the condensation between different phenols and ethyl acetoacetate. Opanasenko et al. studied the comparison of the catalytic performance of MOFs with laige-pore zeolites—BEA and USY... 

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