Induction of photoluminescence and columnar mesomorphism in hemi-disc salphen type Schiff bases via nickel(II) coordination

Bhattacharjee, Chira R.; Datta, Chitraniva; Das, Gourab; Chakrabarty, Rupam; Mondal, Paritosh

doi:10.1016/j.poly.2011.12.001

Cited by 23 publications

(21 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[42] The complexes (Cu-16opd/Cu16mpd/Cu-16npd), were prepared by the reaction of appropriate ligand with copper acetate (1:1 molar ratio) in methanol (Scheme 1). Isolated as brown coloured solids in good yields, the complexes were recrystallised from methanol/dicholoromethane.…”

Section: Resultsmentioning

confidence: 99%

“…The 1 H NMR spectra of ligands is described in our earlier reports. [42] The electronic spectra of compounds were recorded in dichloromethane solution ( Table 1). The absorption spectra of Schiff base ligands are described in our earlier report.…”

Section: Resultsmentioning

confidence: 99%

“…[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.…”

mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2013

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…[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.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Induction of Mesomorphism through Supramolecular Assembly in Metal Coordination Compounds of “salphen”‐Type Schiff Bases: Photoluminescence and Solvatochromism

et al. 2016

Self Cite

View full text Add to dashboard Cite

Mesomorphism induced by metal (VO2+, Ni2+, Cu2+ and Zn2+) coordination and its influence on the photophysical properties of a new series of symmetric “salphen”‐type N,N‐bis(4‐n‐alkoxysalicylidene)‐4,5‐dichloro‐1,2‐phenylenediamine ligands (n = 12, 14, 16) bearing highly electronegative spacer substituents and alkoxy arms of varied length have been investigated. The mesomorphism has been probed by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and variable‐temperature powder X‐ray diffraction (XRD). The Schiff base ligands are non‐mesomorphic; however, coordination to NiII and ZnII ions induces columnar mesomorphism, this being stable down to room temperature in the latter case. Interestingly, the complexes of CuII and VOIV did not show any mesomorphism. The free ligands and the ZnII complexes are luminescent both in the condensed state and in solution, with emission maxima in the condensed state being significantly red‐shifted with respect to those in solution. The energy‐optimized structure of a representative ZnII complex was ascertained to be distorted square planar in a DFT study employing the GAUSSIAN 09 program. The ZnII and VOIV complexes exhibited solvatochromic effects, showing interesting aggregation behavior in the former case.

show abstract

Induction of photoluminescence and columnar mesomorphism in hemi-disc salphen type Schiff bases via nickel(II) coordination

Cited by 23 publications

References 66 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

Induction of Mesomorphism through Supramolecular Assembly in Metal Coordination Compounds of “salphen”‐Type Schiff Bases: Photoluminescence and Solvatochromism

Contact Info

Product

Resources

About