Photoluminescent columnar zinc(II) bimetallomesogen of tridentate [ONO]-donor Schiff base ligand

A new zinc(II) bimetallomesogenic complex, [Zn 2 L 2 ], of tridentate [ONO]-donor Schiff base ligand (L = N-(2-hydroxyethyl)-4-hexadecyloxysalicylaldimines) was synthesised and their mesomorphic and photoluminescence properties were investigated. The compounds were characterised by Fourier transform...

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Bibliographic Details
Published in:Liquid crystals 2013-07, Vol.40 (7), p.942-950
Main Authors: Bhattacharjee, Chira R., Datta, Chitraniva, Das, Gobinda, Das, Dharitri, Mondal, Paritosh, Prasad, Subbarao Krishna, Rao, D.S. Shankar
Format: Article
Language:English
Subjects:
bimetallomesogen
Bimetals
columnar mesophase
Columns (structural)
density functional theory
Differential scanning calorimetry
Diffraction
Mass spectrometry
NMR
Nuclear magnetic resonance
Photoluminescence
photoluminescent
Schiff bases
Spectroscopy
Ultraviolet radiation
X-rays
Zinc
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Summary:A new zinc(II) bimetallomesogenic complex, [Zn 2 L 2 ], of tridentate [ONO]-donor Schiff base ligand (L = N-(2-hydroxyethyl)-4-hexadecyloxysalicylaldimines) was synthesised and their mesomorphic and photoluminescence properties were investigated. The compounds were characterised by Fourier transform infrared spectroscopy (FTIR), 1 H and 13 C nuclear magnetic resonance (NMR), ultraviolet-visible spectroscopy (UV-Vis) spectroscopy, elemental analyses and fast atom bombardment (FAB) mass spectrometry. The mesomorphic behaviour of the complex was investigated by polarised optical microscopy, differential scanning calorimetry and X-ray diffraction (XRD) study. A rectangular or oblique columnar mesophase is conjectured on the basis of powder X-ray diffraction (PXRD) study. The complex is found to be blue light emitter in solution, in solid and in condensed states with broad emission maxima at ∼427-464 nm. The density functional theory (DFT) calculations revealed a distorted square planar structure around each zinc(II) centre in the dinuclear framework. Time-dependent DFT spectral correlative study was undertaken to account for the electronic transition.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2013.788229