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The Co x Zn 1− x Al 2 O 4 system ( x = 0; 0.1; 0.3; 0.5; 0.7; 0.9 and 1) was synthesized by the polymeric precursor method and characterized by the techniques XRD, TG-DTA, IR, UV–vis and colorimetry. The XRD patterns displayed the characteristic peaks of the spinel structure and a good...
Novel, push–pull chromophores combining a cationic benzothiazolium acceptor moiety and either one or two thiophene rings as a part of the conjugated π-system between the donor and the acceptor moieties have been synthesized and characterized. The chromophores displayed pronounced quadratic NLO...
Five, novel pyridazine-based azo chromophores were synthesized by the condensation reaction of 3,6-bis((aminoethyl)thio)pyridazine with 5-(4-X-phenyl)-azo-salicylaldehyde (X = NO 2 , Cl and Et), 5-(2,4-di-Cl-phenyl)-azo-salicylaldehyde and 5-(3,4-di-Cl-phenyl)-azo-salicylaldehyde. The dyes were...
A new reagent combination for the direct preparation of anthraquinone derivatives from the reaction of various benzene derivatives with phthalic anhydride in the presence of Lewis acid/methanesulfonic acid (LAMA) is reported. In this reaction, the products were obtained in high yields and short...
A novel, spiro-type host material 2-(10-naphthylanthracene)-spiro(fluorene-7,9′-benzofluorene) was prepared by reacting 2-bromo-spiro(fluorene-7,9′-benzofluorene) with 9-(2-naphthylanthracene)-10-boronic acid via the Suzuki reaction....
Eight novel polyurethanes with adjustable structures were prepared from two basic polymers; the compounds displayed good solubility in common organic solvents and high thermal stability. The presence of terminal alkyne moieties further improved the thermal stability of the polymers. The resonant...
Mössbauer and X-ray fluorescence studies revealed that a number of valuable monetary units (dollars, pounds, yen, old German marks, and others) are printed using pigments which contain considerable amounts of iron. Mössbauer spectroscopy has been applied to the analysis of the pigments that are...
Several squarylium cyanine dyes derived from benzothiazole, benzoselenazole and quinoline were synthesised and the central four member ring functionalized by substitution of one of the oxygen atoms by benzylamine, aniline, 3-iodoaniline, N , N -dimethylhydrazine and 2-aminosulfonic acid groups....
The structural stability of the pigment was investigated using X-ray diffraction coupled with SEM and UV–vis–IR analysis, as a function of the relative Co content and calcination temperature. A standard formulation prepared from commercial reagents was also prepared and characterized for the...
A simple and facile method for the synthesis of 2,3-bis(( E )-2-aryl vinyl)-quinoxaline and 2,3-bis(( E )-2-aryl vinyl)-pyrido(2,3- b )pyrazine is described. Condensation of cinnamils with 1,2-diaminobenzene and 2,3-diaminopyridine in water using conventional heating and microwave irradiation...
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