87635-52-7

Upstream product

• 89-05-4 1,2,4,5-benzenetetracarboxylic acid 
• 7732-18-5 water 
• 6151-22-0 1,2,4,5-benzenetetracarboxylic acid dihydrate 

Relevant academic research and scientific papers

Functional self-assembly of hydrogen-bonded 3D coordination networks constructed from 1,2,4,5-benzenetetracarboxylic acid

Hydrothermal synthesis, characterization (IR, TG/DTA, element analysis, inductively coupled plasma (ICP)) and single-crystal X-ray structures of H 4Btec hydrate and its two cobalt complexes, colorless [H 4Btec ? 2H2O] n (I), pink [Co(H 2O)6(H2Btec)] n (II), and nacarat {[Co(H2O)3(H2Btec)(Phen)] ? H 2O} n (III) (H4Btec = 1,2,4,5- benzenetetracarboxylic acid, Phen = 1,10-phenanthroline) have been solved. The results showed that I forms a 3D O-H...O hydrogen-bonded network generated from H4Btec and water molecules, II presents a 3D network constructed by mononuclear [Co(H2O)6]2+ cations and H 2Btec2- dianions through extensive hydrogen-bonding interactions, and III gives rise to a pseudo-octahedral coordination geometry. Extensive hydrogen-bonding interactions have significant effects in configuring a 3D network constructed by mononuclear [Co(H2Btec)(Phen)(H 2O)3] neutral molecules and a water molecules.

Novel supramolecular cpmpounds with three-dimensional hydrogen-bonded network [M(H2O)6][H2L] (H4L = 1,2,4,5-benzenetetracarboxylic acid, M = MnII and CoII): Syntheses, characterization and

Two hydrogen-bonded supermolecular compounds having the general have been newly prepared by the reaction of [M(H2O)6](ClO4)2 and [C6H2(COOH)4] (H4L), and structurally

A short hydrogen bond investigation by polarized Raman spectra of Co2+ and Zn2+ salts of pyromellitic acid

Cobalt and zinc salts of 1,2,4,5-benzenetetracarboxylic acid (pyromellitic acid), [C6H2(COO)4H4], have been synthesized and investigate by polarized Raman spectroscopy. These compounds present short intramolecular hydrogen bonds (SHB) between adjacent carboxyl groups. Raman spectra indicate the presence of this interaction in both salts. Three specific vibrational of SHB modes have been investigated: O-H-O symmetric [νsym(OHO)] and asymmetric [νasym(OHO)] stretching modes and O-H stretching mode [ν(O-H)], which they were observed around 300, 850 and 2500 cm-1, respectively. In crystallographic point of view, the cobalt salt presents a symmetric SHB while the zinc salt presents an asymmetric SHB. In cobalt salt all three vibrational modes of O-H-O groups in polarized Raman spectra occur in Ag orientation although in zinc salts two of them are observed in Ag orientation and one in Bg. Spectra analysis indicate that νsym(OHO) mode is observed as Ag to cobalt salt and Bg to zinc salt. This mode occurs in a crowed spectral region and its identification was made by deconvolution techniques. Comparing spectra of the two salts, it is observed a small difference in relative intensity and wavenumber shift of νsym(OHO) (deviance of 43 cm-1) and ν(OH) (deviance of 21 cm-1) modes due probably to differences in O...O distance between salts and in orientation of pyromellitate anion in unit cell. The νasym(OHO) mode does not present significant wavenumber shift due difference in SHB. The ??(OH) band presents a great potential for hydrogen bond studies due to the fact that in its vibrational region (around 2500 cm-1) it is not observed other vibrational modes of these compounds.

Study of the aqueous reactions of metallic ions with benzenetetracarboxylate ions: Part 1. Crystal structures of compounds of the types [M(H2O)6][C6H2(COO)2(COOH)2] (M = Mn, Co and Ni) and Ni(H2O)5(μ-C6H2(COO)4)Ni(H2O)5·6H2O

The reactions of several divalent transition metals with 1,2,4,5-benzenetetracarboxylate ions were studied in aqueous solution. Mn(II), Co(II) and Ni(II) produced ionic products of formula [M(H2O)6][C6H2(COO)2(COOH)2]. The three compounds were characterized by crystallographic methods. The results have shown that the three crystals are isostructural and that they belong to the monoclinic C2/c space group. The metal atom and two O atoms (from two aqua ligands) are located on a two-fold axis, while the other four aqua ligands are located in general positions. The anions contain an inversion center. The two hydrogens on the carboxylic functions form intramolecular H bonds with the carboxylate groups. The average M-OH2 bond distances are 2.181(1) ? for Mn(II), 2.092(1) ? for Co(II) and 2.056(1) ? for Ni(II). The ions are linked together by extensive H bonds. With the Ni salt, a dinuclear species, containing a bridging benzenetetracarboxylato ligand was synthesized and characterized by X-ray diffraction. The compound Ni(H2O)5(μ-C6H2(COO)4)Ni(H2O)5·6H2O contains an inversion center in the center of the phenyl ring. The average Ni-OH2 distance is 2.0710(8) ? and the sixth Ni-O bond is 2.0356(7) ?. The Ni···Ni distance is 11.360(2) ?. The crystal is stabilized by a very elaborate H-bonding system forming a H-bonded three-dimensional network. (C) 2000 Elsevier Science S.A.