Nickel(II) complexes derived from three new bis‐bidentate Schiff bases, H2L1−3, having two N‐n‐propyl‐salicylaldiminate units linked by an O−(CH2)n−O spacer (n = 4, 8, 12, respectively) at the 3‐position of the salicyl moieties, are described. The pyridine adduct of the complex with the shorter spacer forms a cyclic trinuclear structure, [Ni3(L1)3(py)6] (2), in the solid state, where each NiII ion is octahedrally coordinated by two N,O‐bidentate arms of two different ligands and two pyridine nitrogens. The base with n = 8 leads to the double‐helical dinuclear complex, [Ni2(L2)2]·THF (3), which is the first example of a structurally characterised helicate based on a square‐planar N2O2 coordination geometry. In CHCl3 solution, 3 undergoes a disassembly process which results in an equilibrium mixture where the mononuclear species is largely predominant.
In this paper, after revisiting previous data on terthiophene molecules, several attempts are described to use metal containing species such as nanoclusters and molecular complexes as dispersed chromophores in the same ethylene polymer matrix in order to extend an approach to new classes of molecules and improve some specific optical responses including fluorescence dichroism and behaviour as linear optical polarizers is evaluated. Comparison with typical linear polarizers from the same polymer and terthiophenes of innovative gold clusters is discussed as well as transition metal complexes
Polymerizable ionic liquids (ILs) 1-methyl-3-(4-vinylbenzyl)imidazolium chloride, 1-hexyl-3-(4-vinylbenzyl)imidazolium chloride and 1-dodecyl-3-(4-vinylbenzyl)imidazolium chloride were prepared and used as new surfactants for the modification of montmorillonite (MMT). Functionalized MMTs were prepared by cationic exchange between sodium MMT and each of the ILs. Polystyrene (PS)/MMT composites were subsequently prepared by in situ intercalative free radical polymerization of styrene containing dispersed organophilic MMT. Exfoliation of MMT in the PS matrix was achieved only for MMT functionalized with the 1-dodecyl-3-(4-vinylbenzyl)imidazolium-based IL as revealed by X-ray diffraction and electron microscopy. The exfoliated composites showed good transparency and higher decomposition temperature than virgin polymer matrix, particularly pronounced under air atmosphere (Tmax = 66 degrees C), data comparable to or even greater than those reported in the literature for exfoliated PS nanocomposites
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