Preparation,Crystal Structures,and Thermal Studies of Alkaline Earth Nitrocarboxylates |
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| Authors: | Prof. Dr. Bikshandarkoil R. Srinivasan,Santosh Y. Shetgaonkar,PD Dr. Christian Näther |
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| Affiliation: | 1. Department of Chemistry, Goa University, Goa 403 206, India;2. Institut für Anorganische Chemie, Christian‐Albrechts‐Universit?t Kiel, Max‐Eyth Stra?e 2, 24118 Kiel, Germany |
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| Abstract: | The preparation, crystal structures, and thermal properties of [Ca(pyr)2(4‐nba)2]n ( 1 ) (pyr = pyrazole; 4‐nba = 4‐nitrobenzoate) {[Ca(H2O)2(3‐npth)] · H2O}n ( 2 ) (3‐npth = 3‐nitrophthalate), [Mg(H2O)5(3‐npth)] · 2H2O ( 3 ), and [Mg(H2O)4(2‐nba)2] ( 4 ) (2‐nba = 2‐nitrobenzoate) are reported. The anhydrous CaII compound 1 and the diaqua CaII‐3‐nitrophthalate monohydrate 2 are one‐dimensional coordination polymers containing a hexacoordinate CaII ion located on a center of inversion in 1 and a heptacoordinated CaII ion in 2 . In 1 , the 4‐nitrobenzoate moiety acts as a μ2‐bridging bidentate ligand, whereas the 3‐nitrophthalate anion exhibits a μ3‐bridging pentadentate coordination mode in 2 . The hexacoordinate MgII‐containing compounds 3 and 4 do not contain a [Mg(H2O)6]2+ unit and the central MgII ion is coordinated to at least one monodentate carboxylate unit namely the monodentate 3‐npth molecule in 3 and two trans monodentate 2‐nba molecules in 4 . Hydrogen bonding between the lattice water molecules results in the formation of a water dimer in 3 . A comparative study of 17 alkaline earth nitrocarboxylates is described. |
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| Keywords: | Coordination compounds Polymers Calcium Magnesium 4‐Nitrobenzoate Pyrazole |
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