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IJC-A Vol.51A [2012] >
IJC-A Vol.51A(04) [April 2012] >
| 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
Lithium
Sodium
Nitrobenzoates
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. |
| Page(s): | 564-570 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.51A(04) [April 2012]
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