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'Acid Pyromellitates' in keywords Facet   section ZfN Section B  [X]
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1992 (1)
1Author    SvenM. Jessen, H. Orst Küppers, DeanC. LuehrsRequires cookie*
 Title    Hydrogen Bonding in Acid Li-, Ni-, Tetrabutylammonium, and Ammonium Salts of Benzene-1,2,4,5-tetracarboxylic Acid (Pyromellitic Acid)  
 Abstract    Four acid salts o f pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid) have been syn­ thesized and studied by X-ray diffraction and IR spectroscopy. (1) Dilithium dihydrogen py-romellitate pentahydrate, Li2[C6H 2(COO)4H 2] • 5 H zO; monoclinic, P 2 1/m, a = 6.214(2), b = 19.647(7), c = 6.592(2)Ä , ß = 115.90(2)°, Z = 2, R = 0.068, Rw = 0.067. (2) Hexaaquanickel dihydrogen pyromellitate, [N i(H 20) 6][C6H 2(C 0 0) 4H2]; monoclinic, P2/m, a = 6.528(1), b = 9.927(2), c = 6.472(1)Ä , ß = 115.57(1)°, Z = 1, R = 0.044, /?w = 0.039. (3) Tetrabutylammoni­ um trihydrogen pyromellitate, [(C4H 9)4N][C6H-,(COO)4H 3]; monoclinic, P 2 ,/c, a = 9.719(4), b = 18.823(8), c = 15.795(5) Ä, ß = 107.42(3)°, Z = 4, R = 0.059, Rw = 0.039. (4) Diam m onium dihydrogen pyromellitate, [N H 4],[C6H ,(CO O)4H2]; monoclinic, P 2 l/c\ a = 4.7665(6), b = 11.681(3), c = 10.149(2) Ä, ß = 102'. 19(2)°, Z = 2, R = 0.045, Rw = 0.039. Com pounds 1, 2, and 3 show very short intramolecular hydrogen bonds between adjacent carboxylic groups (O -O distances 2.384(6), 2.386(5), 2 . 3 8 7 (3) respectively). Com pound 4 forms intermolecular hy­ drogen bonds (O -O distance 2.642(2) A). The different hydrogen bonding modes are also evi­ dent in the IR spectra. 
  Reference    Z. Naturforsch. 47b, 1141—1153 (1992); received October 1 1991 /March 27 1992 
  Published    1992 
  Keywords    Pyromellitates, Hydrogen Bonds, Crystal Structure, Acid Pyromellitates, IR Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1141.pdf 
 Identifier    ZNB-1992-47b-1141 
 Volume    47