Compounds with two triazole rings IVa,b were synthesized through the reaction of diacid hydrazide firstly with CS 2 /KOH, and secondly with excess of hydrazine hydrate. The one-step reaction of isatin with benzylidene benzeneamine (S 1 -S 10 ) in ethanol gave 2-Ar-3-Ar' [3,4b]

Four new azo dyes L1, L2, L3 and L4, were prepared by linking benzaldehyde p-aminobenzoylhydrazone (3), p-hydroxybenzaldehyde p-amino-benzoylhydrazone (4), naphthaldehyde p-aminobenzoylhydrazone (5) and p-methoxybenzaldehyde paminobenzoylhydrazone (6) to resorcinol and through diazo-coupling reactions. Mixed-ligand dinuclear complexes with general stoichiometry [Cu 2 L(amino antipy.) 2 ]Cl 2 (11, 12, 13 and 14) was synthesed from azo ligands and bidentate ligand (4-aminoantipyrine) with copper. The structures of both azo dyes and their complexes were identified by elemental analyses (C.H.N), FTIR, 1 H-NMR, UV-Vis, atomic absorbtion and magnetic susceptibility.

Theoretical study for stable geometries of a nematic liquid crystal (LC) molecule assembled on the carbon nanotubes (CNT) wall by using semi-empirical molecular quantum calculations within the PM3 method as implemented in Hyperchem package. The interaction influence of ,-stacking between N-4`-Methoxybenzylidine-4-n-butylaniline (MBBA) liquid crystal molecule on the CNT wall led to formation of the local short range orientation order by LC molecules on the surface of the CNT due to the LC-CNT binding energy (,-stacking). The binding energy of the LC molecule on the CNT wall was within the typical van der Waals interaction. This binding originated from the electrostatic energy by a significant amount of charge transfer from the LC molecule to the CNT.

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Derivatives of 6-aryl-[5-methyl-1-(4-methoxy phenyl)-1,2,3-triazol-4-yl-s-triazolo[3,4-b]-1,3,4-Thiadiazoles (9) and (10) were synthesized by treating p-anisidine with sodium nitrite followed by the addition of sodium azide. Treating azide compound (3) with ethylacetoacetate yielded 1,2,3triazolo-4-carboxylic acid (4), which was converted to ester (5) using absolute ethanol. Treating the ester with hydrazine hydrate afforded the acid hydrazide derivative (6), which was reacted with CS 2 and KOH to produce the salt potassium dithiocarbazate (7). Addition of hydrazine to the salt produced 1-amino-2-mercapto-5-[5-methyl-1-(4-methoxy phenyl)-1,2,3-triazol-4-yl]-1,3,4-triazole (8). Treating (8) with p-chlorobenzoic acid and anisic acid afforded the target compounds (9) and (10).