Liquid‐Crystalline Ternary Rare‐Earth Complexes

Knyazev, A. A.; Galyametdinov, Yu. G.; Goderis, Bart; Driesen, Kris; Goossens, Karel; Görller‐Walrand, Christiane; Binnemans, Koen; Cardinaels, Thomas

doi:10.1002/ejic.200700856

Cited by 39 publications

(12 citation statements)

References 64 publications

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“…A similar observation was also noted for all the other complexes (Table 1). The mesophase to the clearing point transition temperature decreases along the lanthanide series, which is in accord with a recent observation on related lanthanide complexes 9a. 19a The reversibility of the thermal behavior was established by DSC in subsequent heating/cooling cycles.…”

Section: Resultssupporting

confidence: 90%

Tunable Emissive Lanthanidomesogen Derived from a Room‐Temperature Liquid‐Crystalline Schiff‐Base Ligand

Pramanik

Das

Bhattacharjee

et al. 2013

Chemistry A European J

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A novel photoluminescent room-temperature liquid-crystalline salicylaldimine Schiff base with a short alkoxy substituent and a series of lanthanide(III) complexes of the type [Ln(LH)3(NO3)3] (Ln = La, Pr, Sm, Gd, Tb, Dy; LH = (E)-5-(hexyloxy)-2-[{2-(2-hydroxyethylamino)ethylimino]methyl}phenol) have been synthesized and characterized by FTIR, (1)H and (13)C NMR, UV/Vis, and FAB-MS analyses. The ligand coordinates to the metal ions in its zwitterionic form. The thermal behavior of the compounds was investigated by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). The ligand exhibits an enantiotropic hexagonal columnar (Col(h)) mesophase at room temperature and the complexes show an enantiotropic lamellar columnar (Col(L)) phase at around 120 °C with high thermal stability. Based on XRD results, different space-filling models have been proposed for the ligand and complexes to account for the columnar mesomorphism. The ligand exhibits intense blue emission both in solution and in the condensed state. The most intense emissions were observed for the samarium and terbium complexes, with the samarium complex glowing with a bright-orange light (ca. 560-644 nm) and the terbium complex emitting green light (ca. 490-622 nm) upon UV irradiation. DFT calculations performed by using the DMol3 program at the BLYP/DNP level of theory revealed a nine-coordinate structure for the lanthanide complexes.

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Section: Resultssupporting

confidence: 90%

Tunable Emissive Lanthanidomesogen Derived from a Room‐Temperature Liquid‐Crystalline Schiff‐Base Ligand

Pramanik

Das

Bhattacharjee

et al. 2013

Chemistry A European J

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“…[25] и показали наиболее типичный для термотропных лантанидомезогенов смектический А мезоморфизм. Было показано влияние структуры лигандов на жидкокрис-таллические и люминесцентные свойства лантанидомезогенов [26,27]. Однако, наиболее важными для исследований и тем более для применения являются лантанидомезогены, обладающие нематической мезофазой [28,29].…”

Section: рис 4 значения анизотропии магнитной восприимчи-вости некоunclassified

Metallomesogens – Formation and Development

Galyametdinov¹,

Knyazev²,

Селиванова³

2015

Liq. Cryst. and their Appl.

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“…bdiketones incorporating transition metals have been extensively studied due to their easier preparation, as well as known chemistries and/or rich structural varieties. Numerous b-diketonate compounds with calamitic as well as non-calamitic structures, generated by a combination of the metal incorporated and the numbers of flexible chains, have been prepared and their mesomorphic properties investigated in detail [23][24][25][26][27][28][29][30]. However, ferrocene-containing b-diketones, widely used in conjugate chemistry [31] and medicinal chemistry, [32] etc., are rarely applied in the studies of metallomesogenic systems.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and liquid crystal properties of ferrocene-based β-diketonato copper(II) and zinc(II) complexes

Liu

Zhao

et al. 2015

Res Chem Intermed

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Heterometallic liquid crystals are of special interest because of the possibility to combine optical, magnetic and electric properties of different metal ions in one mesogenic molecule. In order to investigate new heteropolynuclear mesogenic systems, the long-chain alkyl bromophenyl ferrocenyl b-diketones and their copper(II) and zinc(II) complexes were synthesized and characterized. The X-ray crystal structure reveals that b-diketone ligands exist in the enol isomer form in the crystals. These compounds exhibited good absorption and electrochemical properties. The complexes showed high thermal stability. According to thermal polarizing microscopy and differential scanning calorimetry studies, all complexes display liquid crystal behaviours. The zinc(II) complexes display lower melting point and clear point as well as a wide mesophase range compared with the copper(II) complexes. The obtained metallomesogens are important footsteps toward the development of liquid crystal materials possessing heteropolynuclear, good redox activity and chemically stable ferrocene unit.

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Liquid‐Crystalline Ternary Rare‐Earth Complexes

Cited by 39 publications

References 64 publications

Tunable Emissive Lanthanidomesogen Derived from a Room‐Temperature Liquid‐Crystalline Schiff‐Base Ligand

Tunable Emissive Lanthanidomesogen Derived from a Room‐Temperature Liquid‐Crystalline Schiff‐Base Ligand

Metallomesogens – Formation and Development

Electrochemical and liquid crystal properties of ferrocene-based β-diketonato copper(II) and zinc(II) complexes

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