First alkaline earth metal 3-aminobenzoate (3-aba) complex: 1-D polymeric [Ca(3-aba)2(H2O)2]n assembly

The reaction of CaCO3 or CaCl2·2H2O with 3-abaH results in the formation of the first alkaline-earth metal complex of 3-abaH [Ca(3-aba)2(H2O)2]n (1) in good yield. The product has been characterized by elemental analysis, IR, UV–vis and 1H NMR spectral studies, TGA and single crystal X-ray diffraction studies. The molecular structure of 1 is made up of 1-D polymeric chains that are hydrogen-bonded to each other. The Ca2+ ion in 1 is surrounded by eight oxygen atoms in a distorted square-antiprismatic geometry.