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Synthetic, spectroscopic and structural studies on 4-aminobenzoate complexes of divalent alkaline earth metals: X-ray crystal structures of [{Mg(H2O)(6)}(4-aba)(2)]center dot 2H(2)O and [Ca(H2O)(2)(4-aba)(2)] (4-aba=4-aminobenzoate)

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Title Synthetic, spectroscopic and structural studies on 4-aminobenzoate complexes of divalent alkaline earth metals: X-ray crystal structures of [{Mg(H2O)(6)}(4-aba)(2)]center dot 2H(2)O and [Ca(H2O)(2)(4-aba)(2)] (4-aba=4-aminobenzoate)
 
Creator MURUGAVEL, R
KARAMBELKAR, VV
ANANTHARAMAN, G
 
Subject glutamic-acid
magnesium
chemistry
binding
ligands
 
Description Reactions between MCl2. nH(2)O (M = Mg, Ca, Sr, and Ba) and 4-aminobenzoic acid (4-abaH) result in the formation of complexes [{Mg(H2O)(6)}(4-aba)(2)]. 2H(2)O (1), [Ca(4-aba)(2)(H2O)(2)] (2), [Sr(4-aba)(2)(H2O)(2)] (3), and [Ba(4-aba)(2)Cl] (4), respectively. The new compounds 1 and 2, as well as the previously reported 3 and 4 form an extended intra- and intermolecular hydrogen bonded network in the solid-state. The compounds have been characterized by elemental analysis, pH measurements, thermogravimetric studies, and IR, NMR, and UV-Vis spectroscopy. The solid state structures of the molecules 1 and 2 have been determined by single crystal X-ray diffraction studies. In the case of magnesium complex 1, the dipositively charged Mg cation is surrounded by six water molecules and the two 4-aminobenzoate Ligands show no direct bonding to the metal ion. The calcium ion in 2 is octa-coordinated with direct coordination of the 4-aminobenzoate ligands to the metal ion. The Ca . . . Ca separation in the polymeric chain of 2 is 3.9047(5) Angstrom.
 
Publisher NATL INST SCIENCE COMMUNICATION
 
Date 2011-08-19T08:00:57Z
2011-12-26T12:56:08Z
2011-12-27T05:44:21Z
2011-08-19T08:00:57Z
2011-12-26T12:56:08Z
2011-12-27T05:44:21Z
2000
 
Type Article
 
Identifier INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY, 39(8), 843-850
0376-4710
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10281
http://hdl.handle.net/10054/10281
 
Language en