Coordination of a mesogenic Schiff-base with MnII, CoII, NiII, CuII and ZnII: Synthesis, spectral studies and crystal structures

Singh, Angad Kumar; Kumari, Sharda; Row, Tayur N. Guru; Prakash, Jai; Kumar, K. Ravi; Sridhar, Balasubramanian; Rao, T. R.

doi:10.1016/j.poly.2008.09.013

Cited by 23 publications

(12 citation statements)

References 18 publications

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“…The metal complexes were prepared by reacting the Schiff bases with the corresponding metal salt. 57,59 Similar conventional complexes without the triphenylene group (reasonable models to 2a-2c, 3a-3c and 4a-4c) are square planar for Ni, 53,54 square-planar or distorted square planar for Cu, 54,60 and square pyramidal for oxovanadium. 54 Scheme 1.…”

Section: Synthesis and Characterizationmentioning

confidence: 80%

“…49 Here we focus our attention to Salen-type metal complexes, a well studied source of metallomesogens. [50][51][52] They are known to self-assemble into one-dimensional structures via M•••M, 53,54 55,56 or M•••N interactions. 54 In this work we report uncommon mesomorphic triphenylene-Schiff-base complexes of copper(II), nickel(II), and oxovanadium(IV), which display much higher hole mobility along the columnar stacking of their mesophases, than their organic precursors.…”

Section: Introductionmentioning

confidence: 99%

“…[50][51][52] They are known to self-assemble into one-dimensional structures via M•••M, 53,54 55,56 or M•••N interactions. 54 In this work we report uncommon mesomorphic triphenylene-Schiff-base complexes of copper(II), nickel(II), and oxovanadium(IV), which display much higher hole mobility along the columnar stacking of their mesophases, than their organic precursors. The hole mobility was measured by the space-charge-limited current (SCLC) method.…”

Section: Introductionmentioning

confidence: 99%

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Striking Increase in Hole Mobility upon Metal Coordination to Triphenylene Schiff Base Semiconducting Multicolumnar Mesophases

et al. 2020

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This paper reports the synthesis, liquid crystal behavior, and charge-transport properties in the mesophase of triphenylene Schiff-bases and their copper(II), nickel(II) and oxovanadium(IV) complexes. The thermal and electronic properties of the Schiff-bases are modulated by coordination to the corresponding metal moieties, which have the ability to self-assemble into linear structures and help the alignment of the triphenylene columns. This produces two kinds of electronically non-connected columnar regions, one purely organic and one more inorganic. The most remarkable effect is a striking charge mobility enhancement in the metal containing mesophases, due to the contribution of the more inorganic columns: compared to values of hole mobility along the columnar stacking for the purely organic columnar mesophases, in the order of 10 -7 cm 2 V -1 s -1 , these values jump to 1-10 cm 2 V -1 s -1 in these hybrid inorganic/organic columnar materials.

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Section: Synthesis and Characterizationmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Striking Increase in Hole Mobility upon Metal Coordination to Triphenylene Schiff Base Semiconducting Multicolumnar Mesophases

et al. 2020

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“…In the case of the nickel complexes reported in Aiello et al [28], the complexes undergo a considerable amount of decomposition near the transition to the isotropic. In addition, Singh et al [29] have reported the nematic liquid-crystalline properties of nickel complex with a N,N 0 -di-4-(4 0 -entyloxybenzoate)salicylidene diaminoethane Schiff-base ligand. This complex exhibits low transition temperatures in comparison with the title complexes of this work and undergo decomposition near the transition to the isotropic liquid.…”

Section: Synthesis and Liquid-crystalline Properties Of Nickel(ii) Comentioning

confidence: 99%

Synthesis and Liquid-Crystalline Properties of N,N′-di-(5-(4-Alkoxyphenyl)azo)-Salicylidene-1,2-Phenylene Diiminato Nickel(II) Complexes

Rezvani

Nejati

Alizadeh

et al. 2010

Molecular Crystals and Liquid Crystals

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The synthesis, characterization, and liquid-crystal properties of two new tetradentate N,N 0 -di-(5-(4-alkoxyphenyl)azo)-salicylidene-1,2 phenylene diimine ligands (alkoxy ¼ octloxy, decyloxy) and their nickel(II) complexes are reported. The ligands were prepared by the condensation of the 5-((4-alkoxyphenyl)azo)salicylaldehydes homologous with 1,2 phenylene diamine. The ligands and their nickel complexes have been characterized by infrared (IR), 1 H nuclear magnetic resonance (NMR), mass spectroscopy, and elemental analyses. The liquid-crystalline properties of the ligands and the related nickel complexes were studied by differential scanning calorimetry (DSC) and by using a polarizing microscope equipped with a heating and cooling stage. None of the free ligands exhibited liquid-crystalline behavior but the copper complexes demonstrated an enantiotropic smectic A mesophase.

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“…This effect has been studied in mesogens of trivalent lanthanide ions [7,8] and divalent transition metal ions [9][10][11]. By taking advantage of the variation of the coordination number through a proper choice of the metal ion, one can obtain complexes with different metal-to-ligand ratios and molecular geometries, and thus, modifications in the mesophase behavior are expected [8,11,12]. However, in order to study the influence of the metal ion on the thermal behavior of metallomesogens, it is necessary to have ligand systems that are able to form complexes with many different types of metal ions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Characterization of Some Lanthanide(III) Nitrate Complexes with a Mesogenic Schiff-Base, N,N’-di-4-(4’-heptadecyloxybenzoate) salicylidene-1,3-diaminopropane Derived from 2,4- dihydroxybenzaldehyde

Shrestha¹,

Shakya²

2020

J. Nepal Chem. Soc.

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Complexes of La(III), Pr(III), Nd(III), Sm(III), Gd(III) and Dy(III) with the Schiff-base, N,N′-di-4-(4’-heptadecyloxybenzoate)salicylidene-1,3-diaminopropane, (abbreviated as H2L) have been synthesized and characterized on the basis of elemental analyses, molar conductance, magnetic, electronic, infrared, 1H and 13C NMR spectral techniques. The nephelauxetic ratio (β), the bonding parameter (b1/2), Sinha’s parameter (%δ) and angular overlap parameter (η) have been calculated from the electronic spectra of Pr(III), Nd(III), Sm(III) and Dy(III) complexes. Infrared and NMR spectral data imply a bi-dentate bonding of the Schiff-base in its zwitterionic form (as LH2) to the Ln(III) ions through two phenolate oxygens, rendering the overall geometry around Ln(III) to distorted square antiprism. Polarized optical microscopy (POM) and differential scanning calorimetry (DSC) shows the liquid crystalline property of the ligand with a nematic (N) mesophase. Among the metal complexes, only that of the Gd(III) exhibits smectic B (SmB) and nematic (N) phases.

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Coordination of a mesogenic Schiff-base with MnII, CoII, NiII, CuII and ZnII: Synthesis, spectral studies and crystal structures

Cited by 23 publications

References 18 publications

Striking Increase in Hole Mobility upon Metal Coordination to Triphenylene Schiff Base Semiconducting Multicolumnar Mesophases

Striking Increase in Hole Mobility upon Metal Coordination to Triphenylene Schiff Base Semiconducting Multicolumnar Mesophases

Synthesis and Liquid-Crystalline Properties of N,N′-di-(5-(4-Alkoxyphenyl)azo)-Salicylidene-1,2-Phenylene Diiminato Nickel(II) Complexes

Synthesis and Structural Characterization of Some Lanthanide(III) Nitrate Complexes with a Mesogenic Schiff-Base, N,N’-di-4-(4’-heptadecyloxybenzoate) salicylidene-1,3-diaminopropane Derived from 2,4- dihydroxybenzaldehyde

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