Three series of liquid crystals based on isothiocyanatotolane core with terminal alkenoxy groups (4A-1‒4C-2) have been synthesised via multi-step reactions. Their thermotropic mesophases and physical properties are evaluated by comparison with the alkoxyl analogues (4a-1‒4c-2). The results show that the isothiocyanatotolane LCs with alkenoxyl terminals deliver higher birefringence (0.410~0.436), lower melting points, lower melting enthalpies and viscosity. The effects of the alkenoxy terminal groups and the lateral fluoro substituents on the mesomorphic behaviour and physical properties are discussed. The formulation of the mixture containing isothiocyanatotolane liquid crystals with alkenoxyl terminals provides evidence of an useful candidate for liquid crystal photonics.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
This work put forward a chemiluminescence method for rapid screening of nanoparticles-based mimetic enzymes, which is based on H 2 O 2 -luminol chemiluminesent reaction as a model system and six ferrite nanoparticles, namely, CoFe 2 O 4 、CuFe 2 O 4 、 γ -Fe 2 O 3 、MnFe 2 O 4 、precursor of NiFe 2 O 4 and precursor of magnesium ferrite as mimetic enzymes, and the results were compared with that of horseradish peroxidase (HRP). The results indicate: (1) Like HPR, the six ferrite magnetic nanoparticles are able to catalyze the oxidation of luminol by H 2 O 2 to produce enhanced chemiluminescence, and the catalytic activity of the studied six ferrite magnetic nanoparticles depends on the pH, temperature and substrate (H 2 O 2 ) concentration. Also, they could catalytically oxidize 3,3',5,5'-tetramethyl benzidine (TMB) by H 2 O 2 to produce a typical colour reaction. These results show that the ferrite magnetic nanoparticles possess intrinsic peroxidase properties. (2) The apparent Michaelis constants ( K m ) using H 2 O 2 as substrates were higher than that of HRP, in the order of CoFe 2 O 4 γ -Fe 2 O 3 2 O 4 2 O 4 2 O 4 < precursor of magnesium ferrite. (3) The ferrite magnetic nanoparticles show better pH and temperature tolerance than HRP. The proposed method promises the advantages of simplicity and rapidity, thus can be used for screening of the nanoparticles-based mimetic enzymes in large scale.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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