New heteropolynuclear metallomesogens: copper(II), palladium(II), nickel(II) and oxovanadium(IV) chelates with [3]ferrocenophane‐containing Schiff's base and β‐aminovinylketone

Chae, Hye Won; Kadkin, Oleg N.; Choi, Moon Gun

doi:10.1080/02678290802650261

Cited by 25 publications

(3 citation statements)

References 37 publications

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“…[1][2][3][4][5][6][7] Complexes of paramagnetic metal ion, in particular, are quite significant in the context of novel ferroelectric/piezoelectric and non-linear optical (NLO) materials as they can be switched by weak external magnetic fields. [8][9][10][11][12][13][14][15][16][17] The liquid crystalline behaviour can be modulated by suitably chosen metal ions, long flexible alkoxy arms as well as spacers grafted on rigid aromatic core. [3][4][5] Coordination to metal ions can even induce mesomorphism from nonmesomorphic ligands.…”

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confidence: 99%

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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confidence: 99%

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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“…Similarly, copper(II) and palladium(II) compounds 59 have also been prepared after functionalization with aminovinylketone. 102 The heteropolynuclear complexes 58 exhibit high temperature enantiotropic nematic phases for copper (199 The analog monosubstituted ferrocene ligands containing an enaminoketone have been synthesized and then chelated to Cu(II) and Pd(II) ions in a 2:1 molar ratio (60). 103 Cu(II) complexes show disordered soft crystal phases (on cooling at 107 or 120 o C for n = 12 or 16, respectively) while Pd(II) complexes display monotropic smectic C phases (on cooling at 136 or 140 o C for n =12 or 16, respectively).…”

Section: Heteronuclear Complexes With Ferrocene As Ligandmentioning

confidence: 99%

Organometallic Mesogens

Bardajı́

Coco

2022

Comprehensive Organometallic Chemistry IV

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“…A number of mononuclear salicylaldimine complexes have been documented; [21][22][23] however, very few examples of bi-metallomesogen are reported so far. [24][25][26][27] A binuclear zinc(II) tetradentate Schiff base showing smectic A phase was recorded. [24] Recently, we reported a new low-molecular-weight smectogenic one-ring tridentate [ONO]-donor Schiff base ligand.…”

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confidence: 99%

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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New heteropolynuclear metallomesogens: copper(II), palladium(II), nickel(II) and oxovanadium(IV) chelates with [3]ferrocenophane‐containing Schiff's base and β‐aminovinylketone

Cited by 25 publications

References 37 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

Organometallic Mesogens

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

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