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http://nopr.niscpr.res.in/handle/123456789/15487| 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] ●2H2O and [Ca(H2O)2( 4-aba)2] (4-aba=4-aminobenzoate) |
| Authors: | Murugavel, Ramaswamy Karambelkar, Vivek V Anantharaman, Ganapathi |
| Issue Date: | Aug-2000 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Reactions between MCl2●nH2O (M = Mg, Ca, Sr, and Ba) and 4-aminobenzoic acid (4-abaH) result in the formation of complexes [(Mg(H2O)6}(4-aba)2) ●2 H2O (1), [Ca(4-aba)2(H2O)2] (2), [Sr(4-aba)2(H2O)2] (3), and [8a(4-aba)2CI] (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) Å. |
| Page(s): | 843-850 |
| Appears in Collections: | IJC-A Vol.39A(08) [August 2000] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 39A(8) 843-850.pdf | 1.68 MB | Adobe PDF | View/Open |
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