Novel photoluminescent hemi-disclike liquid crystalline Zn(II) complexes of [N2O2] donor 4-alkoxy substituted salicyldimine Schiff base with aromatic spacer

Bhattacharjee, Chira R.; Das, Gourab; Mondal, Paritosh; Rao, N. V. S.

doi:10.1016/j.poly.2010.08.017

Cited by 66 publications

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“…[3][4][5][6]35,36] Recently, a variety of structurally analogous 4-substituted zinc(II), oxovanadium(IV), nickel(II) using phenylene/cyclohexane diamine spacer exhibiting different types of columnar phases have been reported by us. [37][38][39][40][41][42][43][44] Quite surprisingly, liquid crystalline copper(II)-salen complexes bearing aromatic spacer, affording columnar mesophases have not yet been reported. Pertinent here is to mention that copper (II) complexes with cyclohexane diamine spacer have been reported to show rectangular columnar mesophase.…”

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“…Pertinent here is to mention that copper (II) complexes with cyclohexane diamine spacer have been reported to show rectangular columnar mesophase. [39] Set in this backdrop we embarked on the synthesis of copper(II) complexes of 'salen' type Schiff base ligand with different substituent on aromatic spacer group and explore their mesomorphic behaviour and collate with related reported [37][38][39][40][41][42][43][44] ligand systems with different divalent metal ions.…”

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Influence of spacer group substituent on mesomorphism in copper complexes of ‘salen’ type Schiff bases bearing long alkoxy arm

et al. 2013

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Novel four-coordinate copper(II) complexes of the type [CuL], L = N, N′-di-(4-hexadecyloxysalicylidene)-4-substituted(X)l,2-diamino-benzene (X = H, CH 3 , NO 2 ) were synthesised. The compounds were characterised by elemental analyses, Fourier transform infrared spectroscopy, 1 H, 13 C nuclear magnetic resonance, ultravioletvisible spectroscopy and fast atom bombardment mass spectrometry. The liquid crystalline properties were ascertained using polarised optical microscopy, differential scanning calorimetry and powder X-ray diffraction technique. The ligands are non-mesomorphic, but the complexes with methyl (CH 3 ) or no substituent on the aromatic spacer showed rectangular columnar (Col r ) mesophase and rectangular plastic columnar (Col rp ) phase, respectively. An antiparallel dimeric association of half-disc shaped molecule forming a disc-like arrangement in the mesophase is proposed on the basis of X-ray diffraction study. The complex with nitro (NO 2 ) substituent in the spacer linkage decomposes before melting precluding any mesomorphic study. The density functional theory calculations carried out using Gaussian 09 program at B3LYP level revealed distorted square planar geometry around the metal centre. The natural charges and electronic configuration of the atoms of the complexes and free ligand were evaluated by natural bond orbital analysis.

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Influence of spacer group substituent on mesomorphism in copper complexes of ‘salen’ type Schiff bases bearing long alkoxy arm

et al. 2013

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“…[12][13][14][15] In this context, comprehensive research effort has been invested from our group recently in the design of metalcontaining LCs with the aim of combining the unique properties of anisotropic fluids with the specific luminescent properties. [16][17][18][19][20] The molecular shape has a dominant control on the mesomorphic behaviour. A number of mononuclear salicylaldimine complexes have been documented; [21][22][23] however, very few examples of bi-metallomesogen are reported so far.…”

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

et al. 2013

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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.

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“…7, Complexes 1-3 may be the potential fluorescence materials for green-light emitting diode devices because of the green fluorescence emission. A lot of luminescent Zn(II) coordination complexes containing aromatic ligands have been reported as they have potential applications in optical amplifiers, optical waveguides and OLEDs [14,[20][21][22][23][24].…”

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Three polymers based on pyridine-2,3,5,6-tetracarboxylic acid: Syntheses, crystal structures and luminescent properties

Gao

Zhang

et al. 2012

Inorganic Chemistry Communications

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Novel photoluminescent hemi-disclike liquid crystalline Zn(II) complexes of [N2O2] donor 4-alkoxy substituted salicyldimine Schiff base with aromatic spacer

Cited by 66 publications

References 47 publications

Influence of spacer group substituent on mesomorphism in copper complexes of ‘salen’ type Schiff bases bearing long alkoxy arm

Influence of spacer group substituent on mesomorphism in copper complexes of ‘salen’ type Schiff bases bearing long alkoxy arm

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

Three polymers based on pyridine-2,3,5,6-tetracarboxylic acid: Syntheses, crystal structures and luminescent properties

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