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<p>In this research paper, we are reporting a copper-based ionic liquid crystal known as the ionic metallomesogen as well, denoted by the chemical formula, [Cu(tet)(X)<sub>2</sub>](Z)<sub>2</sub>.2H<sub>2</sub>O, where Ligand (X) = 4-hexadecyloxypyridine (4-CH<sub>3</sub>(CH<sub>2</sub>)<sub>15</sub>OC<sub>5</sub>H<sub>4</sub>N); (tet) = Cyclam (1,4,8,11-tetraazacyclotetradecane); Z = 4-nitrobenzoate ion (4-O<sub>2</sub>NC<sub>6</sub>H<sub>4</sub>COO<sup>−</sup>). The yield of the compound was 60.8%. The molecular formula C<sub>66</sub>H<sub>110</sub>CuN<sub>8</sub>O<sub>12</sub> was confirmed by elemental analysis. FTIR spectra identified key functional groups. The octahedral geometry of copper was verified by a wide-ranging intra d orbital transition band appeared at 541&#xa0;nm in the UV–visible spectroscopy that further endorsed by an effective moment of magnet value is 1.7 Bohr magneton. Thermal studies highlighted its stability up to 200&#xa0;°C with TG (thermogravimetric) analysis indicating a multi-step decomposition. Combined analyses using DSC and polarized light microscopy showed that the compound melted at 46&#xa0;°C, which is below the 100&#xa0;°C threshold usually required for classifying a compound as an ionic liquid crystal. Additionally, a low-enthalpy exothermal peak at 60.0&#xa0;°C in the DSC trace corresponds to the development of a SmA-type mesophase at 59.2&#xa0;°C upon cooling, as observed under polarized light microscopy. These findings underscore the potential of this compound as an ionic metallomesogen in advanced applications, leveraging their unique structural, thermal, ionic, mesogenic, and electronic attributes.</p>

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Strong electron-withdrawing nature of the nitro group effecting the liquid crystalline properties of copper–organo metallic compound

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Naima Sharmin,
  • Jahidul Islam,
  • Rabiul Islam,
  • Mudassar Shahid

摘要

In this research paper, we are reporting a copper-based ionic liquid crystal known as the ionic metallomesogen as well, denoted by the chemical formula, [Cu(tet)(X)2](Z)2.2H2O, where Ligand (X) = 4-hexadecyloxypyridine (4-CH3(CH2)15OC5H4N); (tet) = Cyclam (1,4,8,11-tetraazacyclotetradecane); Z = 4-nitrobenzoate ion (4-O2NC6H4COO−). The yield of the compound was 60.8%. The molecular formula C66H110CuN8O12 was confirmed by elemental analysis. FTIR spectra identified key functional groups. The octahedral geometry of copper was verified by a wide-ranging intra d orbital transition band appeared at 541 nm in the UV–visible spectroscopy that further endorsed by an effective moment of magnet value is 1.7 Bohr magneton. Thermal studies highlighted its stability up to 200 °C with TG (thermogravimetric) analysis indicating a multi-step decomposition. Combined analyses using DSC and polarized light microscopy showed that the compound melted at 46 °C, which is below the 100 °C threshold usually required for classifying a compound as an ionic liquid crystal. Additionally, a low-enthalpy exothermal peak at 60.0 °C in the DSC trace corresponds to the development of a SmA-type mesophase at 59.2 °C upon cooling, as observed under polarized light microscopy. These findings underscore the potential of this compound as an ionic metallomesogen in advanced applications, leveraging their unique structural, thermal, ionic, mesogenic, and electronic attributes.