147622-39-7Relevant academic research and scientific papers
Effect of hydrogen-bonded supramolecular assembling on liquid crystal properties of imidazole-containing azomethines and their chelates with copper(II)
Kadkin, Oleg N.,Tae, Jigeon,Kim, Eun Ho,Kim, So Yeon,Choi, Moon-Gun
, p. 1 - 12 (2010)
A series of imidazole-containing rod-like Schiff's bases and their ionic copper(II) chelates with various lengths of the terminal alkyl chain containing 6, 8, 10, 12, 14 and 16 carbon atoms have been synthesised. The synthesised compounds were characterised by elemental analyses, 1H NMR, IR and UV-vis and mass spectroscopies. Thermotropic smectic C mesophases in the ligands and smectic A mesophases in the copper(II) complexes were identified using POM, DSC and small-angle XRD scattering methods. X-ray diffraction patterns of the prepared imidazole imines indicate to supramolecular self-assembled structures in the liquid crystal state, which are formed by means of intermolecular hydrogen bonds. It was established that both liquid crystal arrangement and supramolecular assemblies in ligands disappeared near 190°C, mainly regardless of the lengths of the terminal alkyl chains. Contrary, assembling of the copper(II) complexes into supramolecular bilayers occurs near 200°C, which causes their transition to a smectic A mesophase.
Combined stabilizing effects of trifluoromethyl groups and semifluorinated side chains on the thermotropic liquid-crystal behavior of β-enamino ketone ligands and their bischelate PdII complexes
Martin, Alexander,Mügge, Carolin,Gin, Douglas L.,Donnio, Bertrand,Weigand, Wolfgang
, p. 5609 - 5617 (2015/03/30)
Several linear β-enamino ketone ligands and their corresponding bischelate PdII complexes bearing various combinations of methyl and trifluoromethyl groups at the chelating center as well as peripheral hydrocarbon and perfluorinated side chains were prepared. The effect of these structural modifications on the thermotropic liquid-crystalline behavior of both the ligands and the corresponding metal complexes was studied. The relationships between the molecular structures and the corresponding thermal properties are discussed. As expected, the persistence of liquid-crystalline behavior was highly sensitive to both applied structural manipulations. On the one hand, increased steric congestion around the chelating moiety clearly appears detrimental to the retention of mesomorphism. On the other hand, perfluorinated chains at the molecular extremity can occasionally restore it. Therefore, the regulation of the balance between both structural parameters permits a precise control of the mesomorphic properties of the compounds.
A new type of symmetrical banana-shaped material based on N-methyldiphenylamine as a core moiety exhibiting an Ad→A2 transition
Majumdar, Krishna C.,Chattopadhyay, Buddhadeb,Chakravorty, Santanu,Pal, Nilasish,Sinha, Randhir Kumar
scheme or table, p. 7149 - 7152 (2009/04/10)
The synthesis and characterization of a homologous series of Schiff bases consisting of an N-methyldiphenylamine moiety as the central core is reported, which exhibits smectic A phase and transitions from the partial bilayer SmAd phase to the bilayer SmA2 phase as the temperature is lowered.
Rodlike metallomesogens containing nickel(II), palladium(II) and copper(II) based on novel enaminoketonato ligands
Roll, Carsten P.,Martin, Alexander G.,Goerls, Helmar,Leibeling, Guido,Guillon, Daniel,Donnio, Bertrand,Weigand, Wolfgang
, p. 1722 - 1730 (2007/10/03)
Several new enaminoketone mesogens were synthesized and coordinated to various metal salts to yield a variety of novel rodlike metal-containing liquid crystals. The mesophases were characterized by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS). Whereas the free ligands display SmA and nematic mesophases, the Ni II and PdII complexes give rise to SmC and nematic phases, and the paramagnetic CuII mesogens to a narrow temperature-range nematic mesophase only. The magnetic behaviour of the latter was studied by means of EPR and magnetic susceptibility (SQUID) measurements.
Polyfunctional phosphine ligands. Preparation of 4'-formyl-2-diphenylphosphinoacetophenone and its coordination properties
Soulivong, Daravong,Ziessel, Raymond,Matt, Dominique
, p. 207 - 216 (2007/10/02)
The trifunctional ligand C(O)CH2PPh2 (5) has been prepared in four steps (overall yield 50percent) starting from terephthalaldehyde mono-(diethylacetal) (1): reaction of 1 with CH3MgBr gives C6H4>CH(OH)CH3 (2).This is oxidize
Synthesis and coordination properties of novel polyfunctional phosphine ligands
Soulivong, Daravong,Matt, Dominique,Ziessel, Raymond,Douce, Laurent,Deschenaux, Robert
, p. 1151 - 1154 (2007/10/02)
4′-formyl-2-diphenylphosphino-acetophenone 5 has been prepared in four steps (50%) starting from terephtalaldehyde mono-(diethylacetal) 1. Condensation of 5 with the para-substituted anilines H2NA-i gives quantitatively the phosphine-imines 6-8
