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- W2060951698 abstract "Reactions of alkaline earth metal chlorides with 2-aminobenzoic acid (2-abaH) have been investigated. The treatment of MCl 2 ·nH 2 O (M = Mg, Ca, Sr or Ba) with 2-abaH in a 1:2 ratio in a MeOH/H 2 O/NH 3 mixture leads to the formation of anthranilate complexes [Mg(2-aba) 2 ] (1), [Ca(2-aba) 2 (OH 2 ) 3 ] (2), [{Sr(2-aba) 2 (OH 2 ) 2 }·H 2 O)] (3), and [Ba(2-aba) 2 (OH 2 )] (4), respectively. Alternatively, these products can also be obtained starting from the corresponding metal acetates. Anthranilate complexes 1-4 have been characterized with the aid of elemental analysis, pH measurements, thermal analysis, and infrared, ultraviolet, and NMR ( 1 H and 13 C) spectroscopic studies. All the products are found to be thermally very stable and do not melt on heating to 250 °C. Thermal studies of complexes 2-4, however, indicate the loss of coordinated and lattice water molecules below 200 °C. In the case of the magnesium complex, the analytical and thermogravimetric studies indicate the absence of any coordinated or uncoordinated water molecules. Further, the solid-state structures of metal anthranilates 2-4 have been established by single-crystal X-ray diffraction studies. While the calcium ions in 2 are heptacoordinated, the strontium and barium ions in 3 and 4 reveal a coordination number of 9 apart from an additional weak metal-metal interaction along the polymeric chains. The carboxylate groups show different chelating and bridging modes of coordination behavior in the three complexes. Interestingly, apart from the carboxylate functionality, the amino group also binds to the metal centers in the case of strontium and barium complexes 3 and 4. However, the coordination sphere of 2 contains only O donors. All three compounds form polymeric networks in the solid state with the aid of different coordinating capabilities of the carboxylate anions and O-H···O and N-H···O hydrogen bonding interactions." @default.
- W2060951698 created "2016-06-24" @default.
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- W2060951698 date "2000-04-03" @default.
- W2060951698 modified "2023-09-23" @default.
- W2060951698 title "Synthesis, spectral characterization, and structural studies of 2-aminobenzoate complexes of divalent alkaline earth metal ions: X-ray crystal structures of [Ca(2-aba) 2 (OH 2 ) 3 ], [{Sr(2-aba) 2 (OH 2 ) 2 }·H 2 O], and [Ba(2-aba) 2 (OH 2 )] ∞ (2-abaH = 2-NH 2 C 6 H 4 COOH)" @default.
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