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Title: Synthesis and structural characterization of bis(μ2-aqua)tetrakis(aqua)dilithium(I) bis(4-nitrobenzoate)
Authors: Srinivasan, Bikshandarkoil R
Shetgaonkar, Santosh Y
Dhavskar, Kiran T
Sundar, Jeyaperumal Kalyana
Natarajan, Subramanian
Keywords: Coordination Chemistry
Supramolecular Chains
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: Reaction of alkali metal carbonates M2CO3 (M = Li or Na) with 4-nitrobenzoic acid (4-nbaH) results in the formation of [(H2O)4Li2(μ-H2O)2](4-nba)2 (4-nba = 4-nitrobenzoate) (1) and [Na(4-nba)(H2O)3] (2). Compounds (1) and (2) have been characterized by analytical, spectral and thermal data. The structure of (1) consists of bis(μ2-aqua)tetrakis(aqua)dilithium(I) dication situated on an inversion centre and a free 4-nba anion. In compound (2), one of the two independent 4-nba functions as a μ2-bridging bidentate ligand, bridging the two unique Na(I) ions via the oxygen atoms of the nitro functionality. Hydrogen bonding of coordinated water ligands in a dinuclear lithium cation with coordinated water molecules in an adjacent unit leads to the formation of a supramolecular chain of [(H2O)4Li2(μ-H2O)2]2+ cations. The cationic chain is further H-bonded to 4-nba anions resulting in alternating layers of [(H2O)4Li2(μ-H2O)2]2+ cations and 4-nba anions. Compounds (1) and (2) exhibit enhanced fluorescence emission. A study of the known s-block metal compounds containing 4-nba and coordinated water ligands reveals that the coordination number of the central metal varies from four in Li to nine in Ba.
Description: 564-570
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(04) [April 2012]

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