Synthesis, spectroscopy, thermal studies and supramolecular structures of two new alkali-earth 4-nitrobenzoate complexes containing coordinated imidazole

Abstract

The reaction of hydrated magnesium or calcium 4-nitrobenzoate (4-nba) generated in situ, with imidazole (Im) results in the formation of the complexes [Mg(H 2 O) 2 (Im) 2 (4-nba) 2 ] 1 and [Ca(H 2 O) 3 (Im)(4-nba) 2 ]⋅Im 2, which exhibit the same metal:4-nba:Im ratio but different degrees of hydration. Complex 1 crystallizes in the triclinic Pī space group and the Mg atom is located on an inversion centre, while 2 crystallizes in the monoclinic P2 1

catena-Poly[[(pentaaqua)(4-nitrobenzoato-O,O’)barium(II)] (μ-4-nitrobenzoato-O,O’)]: A barium(II) coordination polymer showing O-H⋯O and C-H⋯O interactions

“…25 In addition, we have incorporated imidazole (Im) ligand into the coordination sphere of Mg and Ca 4-nitrobenzoates. 15 In view of this, the reactivity of the title complex was investigated with N-donor ligands to incorporate other ligands and get new compounds. So far, our attempts to incorporate ligands like Im into the coordination sphere of Ba(II) in 1 have not been successful.…”

“…[15][16][17][18] Polymeric Ba(II) carboxylates of varying dimensionalities have been structurally characterized earlier using carboxylic acids like 2-aminobenzoic acid (2-abaH), 2,2′-dithiobis(benzoic acid), diphenic acid, the α,β-unsaturated mesaconic acid, thiosalicylic acid, terephthalic acid and pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid). [26][27][28][29][30][31] In all these com- plexes where the carboxylate functions as a bridging ligand, the shortest Ba⋅⋅⋅Ba distance between adjacent Ba(II) ions in the polymeric chain varies from 4⋅069 Å in the coordination polymer derived from 2,2′-dithiobis(benzoic acid) to 6⋅750(1) Å in the title complex ( The short ring interactions and distances between the ring centroids (Cg-Cg) in 1 were analysed by using the program Platon.…”

“…In recent reports we have described the synthesis and structural characterization of 4-nitrobenzoate (4-nba) complexes of Mg(II), Ca(II) and Sr(II). [15][16][17][18] In continuation of this work, we have structurally characterized a one dimensional Ba(II) coordination polymer using 4-nba as ligand, which exhibits O-H⋅⋅⋅O and C-H⋅⋅⋅O interactions. The results of these investigations are described in this paper.…”

Synthesis, properties and supramolecular structure of di(aqua)bis(ethylenediamine)nickel(II) bis(4-nitrobenzoate)

“…11 Our recent work has unraveled a rich structural chemistry of alkaline-earth 4-nitrobenzoates. [12][13][14][15][16][17][18] The available literature on transition metal 4-nitrobenzoates especially Ni(II) is restricted to a few structure reports. [19][20][21][22] In view of this, we have initiated a systematic study of the chemistry of the transition metal 4-nitrobenzoates.…”

A one-dimensional barium(II) coordination polymer with a coordinated nitro group of 2-nitrobenzoate

“…6 2 ]⋅Im, serve to demonstrate the rich structural chemistry of the alkali-earth 4-nitrobenzoates and the versatile ligational behaviour of 4-nba. [8][9][10][11][12] An important structural feature of all these compounds is the Hbonding characteristics of the -NO 2 functionality of the 4-nba anion with the nitro oxygen atom functioning as a H-bond acceptor and the coordinated or lattice water molecules providing the H-donors. In one-dimensional polymer 12 [[Ba(H 2 O) 5 (4-nba-O,O′)] (μ 2 -4-nba-O,O′)] n the -NO 2 group is involved in several O-H⋅⋅⋅O and C-H⋅⋅⋅O interactions with the -NO 2 groups in one polymeric chain hydrogen bonded with the coordinated waters and aromatic hydrogen atoms on an adjacent chain.…”