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A series of polypyridine Ruthenium(II) complexes Ru(II)(ttp)(L)X×PF 6 were synthesized and characterized, where L are 2,2′-bipyridine(bpy), 4,4′-dimethyl-2,2′-bipyridine(dmpy), 1,10-phenanthroline(phen) and X are Cl − , NCS − , CN − ; ttp=4′-p-tolyl-2,2′:6′,2′′-terpyridine....
2-Chloro-5,6-dicyano-3-(2′-(1′,3′,3′-trimethylindolinylidine) methyl)pyrazine 3a showed large differences in λ max from solution to solid state resulting from strong intermolecular π – π interactions. Related derivatives were synthesized by the nucleophilic substitution of...
Metal complexes of carboxylic acids were prepared, and the protecting effect of these compounds towards the photofading of colour materials derived from colour formers was examined on cellulose. It was proposed that nickel or zinc salts of 8-hydroxyquinoline-2-carboxylic acid and its derivatives...
Buff pigments obtained by introducing colored impurities (Cr 3+ ) in the TiO 2 rutile lattice are usually prepared by solid state synthesis route. The final optical aspect of the material depends mainly on the possibility to observe the formation during the thermal process of a homogeneous solid...
The preparation in high yield and purity, and the photochemical and photophysical properties of some new azomethine and alkoxy derivatives of benzanthrone are reported, and their utility as luminophore dyes in liquid crystalline systems for displays of the ‘guest–host’ type is discussed.
3H-1,8,9-Trimethylthieno(3′,2′:6,7)naphtho(2,1-b)pyran-3-one, a potential photobiological agent, was synthesized in six steps starting from commercially available 2,7-naphthalenediol. The key step involved is a Newman–Kwart rearrangement of naphthopyrone 2 . The structures of 6 and its...
The intense colouring antibiotic Sodium Rifamicyn SV (Rfc) is decomposed by direct and sensitized photoirradiation, through a complex mechanism. This influences the microbiological activity of Rfc. It reacts from its electronic excited states upon light absorption and by a singlet molecular...
The standard affinity for silk of nine pyridine disperse dyes has been measured. By means of principal component analysis the data have been compared with affinities on nylon and acetate using experimental and theoretical descriptors as explanatory variables, calculated by semiempirical and...
Aminosquarylium dyes(6a–d) were prepared by condensation of aminosquarates (3a–d) and 1-ethyl-2,3,3-trimethylindolenium iodide (5) and structure of dye 6 was discussed on the basis of IR and solvatochromism. A new aminosquarylium dye 6a absorbed at a longer wavelength (18 nm) than the...
Structure optimization in a series of thiadiazolyl azo dyes to be used as disperse dyes for polyester fibres has been carried out by a chemometric approach based on experimental design in principal properties and PLS modelling. The thiadiazole nucleus confers a general excellent performance with...
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