We performed time-resolved spectral investigations of two distyrylcarbazole derivatives, 2,7- and 3,6-distyrylcarbazole (2,7-DPVTCz and 3,6-DPVTCz, respectively), in dilute toluene solution and in solid films mixed with poly(methyl methacrylate) (PMMA). The lifetime of 2,7-DPVTCz in its excited state in solution is approximately 100 times as great as that of 3,6-DPVTCz, consistent with their ph...

Four new D-pi-D (or D-pi-D-pi-D) complexes 9-ethyl-3-E-((1-ferrocenyl)vinyl)-carbazole (1), 9-ethyl-3,6-E,E-((1,1-diferrocenyl)vinyl)- carbazole(2), 10-ethyl-3-E-((1-ferrocenyl)vinyl)-phenothiazine (3), 10-ethyl- 3,7-E,E- ((1,1-diferrocenyl)vinyl)-phenothiazine (4), have been obtained by solid-phase Wittig reactions and fully characterized. The four complexes were treated with iodine leading to...

The nucleotide sequences of the 27,939-bp-long upstream and 9,448-bp-long downstream regions of the carAaAaBaBbCAc(ORF7)Ad genes of carbazole-degrading Pseudomonas sp. strain CA10 were determined. Thirty-two open reading frames (ORFs) were identified, and the car gene cluster was consequently revealed to consist of 10 genes (carAaAaBaBbCAcAdDFE) encoding the enzymes for the three-step conversio...

Carbazole derivatives [1-6] have been reported to exhibit pharmacological properties like anti­ tumour, anticonvalsant, psychotropic, antiinflam­ matory, antihistamine and antibiotic properties. Oxazole derivatives [7-15] have been used as optical whitening agents, sensitizing dyes, photoreducing pigments, muscle relaxant and effective against wide range of enteric infections, appetite depressa...

Abul-Fadl, M. A. M. (1948). Biochem. J. 42, xxxvii. Bartley, W. (1953). Biochem. J. 54, 677. Hanes, C. S. & Isherwood, F. S. (1949). Nature, Lond., 164, 1107. Lorenzen, E. J. & Smith, S. E. (1947). J. Nutr. 33,143. Sideris, C. P. (1937). Industr. Engng Chem. (Anal.), 9, 445. Skinner, J. T., Peterson, W. H. & Steenbock, H. (1931). J. biol. Chem. 90, 65. Vogel, A. I. (1948). A Textbook of Qualita...

High repetition rate (HRR) lasers are essential in multiphoton microscopy for satisfactory signal to noise at low average powers. However, HRR lasers generate thermal distortions in samples even with the slightest single photon absorption. Using an optical chopper with HRR lasers ("blanking") we demonstrate a femtosecond z-scan setup that effectively eliminates thermal as well as small linear a...

Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If imple...

Organometallic materials that exhibit white luminescence in condensed phases are of considerable interest for lighting and display applications. Herein, new carbazole-based Au(I) complexes containing an isocyanide group a long pentyl chain were synthesized. The complex with unsubstituted carbazole moiety exhibited emission at room temperature as well nematic liquid crystalline behavior. Color t...

A linear coplanar carbazole-based benzoxazole derivative without any auxiliary moieties could gelatinize organic solvents, and exhibited emission enhancement owing to the J-aggregate formation.

Energy transfer in solid polymers is favoured by strong interactions between chromophores. It depends on the nature of these chromophores, and decreases with increasing distance between them. Orientation of the chains and sample crystallinity improve its efficiency. Energy transfer is useful to prevent polymer degradation. It can also be responsible for the initiation of the photo-oxidation of ...