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Title: Structural characterization of catena-[bis(μ-4-nitrobenzoato)-diaqua-calcium 4,4'- bipyridine] and catena-[bis(μ-4-nitrobenzoato)-diaqua-calcium 1H-1,2,4-triazole]
Authors: Srinivasan, Bikshandarkoil R
Dhavskar, Kiran T
Raghavaiah, Pallepogu
Keywords: Calcium;4-Nitrobenzoate;1,2,4-triazole; 4,4′-Bipyridine;Coordination polymer;Edge-sharing {CaO8} polyhedra
Issue Date: Jun-2021
Publisher: CSIR-NIScPR, India
Abstract: An attempted incorporation of N-donor ligand in the coordination sphere of Ca in the molecular solid [Ca(H2O)4(4-nba)2] (4-nba=4-nitrobenzoate) resulted in the formation of the one-dimensional (1D) coordination polymers catena-[bis(μ-4- nitrobenzoato)-diaqua-calcium 4,4'-bipyridine] 1 and catena-[bis(μ-4-nitrobenzoato)-diaqua-calcium 1H-1,2,4-triazole] 2 with the N-heterocycle functioning as a solvate. The syntheses, crystal structures and properties of [Ca(H2O)2(4-nba)2]·L (L=4,4′-bipyridine 1; L=1H-1,2,4-triazole 2) are reported. The central Ca(II) in 1 and 2 exhibits eight-coordination and the aqua ligands are terminal, while 4-nitrobenzoate functions as a μ2-bridging ligand. The μ2-η2:η1 tridentate binding mode of the 4-nba ligand results in the formation of an infinite chain of edge-sharing {CaO8} polyhedra flanked by the 4-nitrobenzoates. The solvate 4,4′-bipyridine in 1 (or 1,2,4-triazole in 2) links adjacent polymeric chains with the aid of O-H···N hydrogen bonding interactions. A comparative study of {CaOx} polyhedral linking in structurally characterized calcium coordination polymers based on 4-nitrobenzoate is described.
Page(s): 785-796
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.60A(06) [June 2021]

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