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Title: Synthesis and structural characterization of bis(μ<sub>2</sub>-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 M<sub>2</sub>CO<sub>3</sub> (M = Li or Na) with 4-nitrobenzoic acid (4-nbaH) results in the formation of [(H<sub>2</sub>O)<sub>4</sub>Li<sub>2</sub>(μ-H<sub>2</sub>O)<sub>2</sub>](4-nba)<sub>2</sub> (4-nba = 4-nitrobenzoate) (<b style="">1</b>) and [Na(4-nba)(H<sub>2</sub>O)<sub>3</sub>] (<b style="">2</b>). Compounds (<b style="">1</b>) and (<b style="">2</b>) have been characterized by analytical, spectral and thermal data. The structure of (<b style="">1</b>) consists of bis(μ<sub>2</sub>-aqua)tetrakis(aqua)dilithium(I) dication situated on an inversion centre and a free 4-nba anion. In compound (<b style="">2</b>), one of the two independent 4-nba functions as a μ<sub>2</sub>-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 [(H<sub>2</sub>O)<sub>4</sub>Li<sub>2</sub>(μ-H<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> cations. The cationic chain is further H-bonded to 4-nba anions resulting in alternating layers of [(H<sub>2</sub>O)<sub>4</sub>Li<sub>2</sub>(μ-H<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> cations and 4-nba anions. Compounds (<b style="">1</b>) and (<b style="">2</b>) exhibit enhanced fluorescence emission. A study of the known <i style="">s</i>-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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