The photophysical properties of 2.3 nm thioglycolic acid (TGA) coated CdTe quantum dots (QDs) prepared by a reflux method have been studied in the presence of cationic meso-tetrakis(4-N-methylpyridyl) zinc porphyrin (ZnTMPyP4). Addition of the CdTe QDs to the porphyrin in H(2)O results in a marked red-shift and hypochromism in the porphyrin absorption spectrum, indicative of a non-covalent bind...

Electronic coupling between the porphyrin units of a laterally-bridged dimanganese(III) bis-porphyrin 2 is explored using electrochemistry, spectroelectrochemistry and resonance-Raman spectroscopy. It is found that strong electronic interactions between the manganese(III) ion and the porphyrin macrocycle enhance the perturbations experienced by these bis-porphyrin systems when compared to relat...

The synthesis, characterization and photophysical properties of a series of “center-to-edge” type phosphorus() porphyrin arrays in which the central phosphorus atom of one phosphorus() porphyrin is connected to the mesophenoxy edge of the other phosphorus() porphyrin(s) are described. The conformation of the porphyrin arrays is estimated from the NMR data on the basis of the porphyrin ring c...

We studied the supramolecular assembly of a multifunctional ligand, cis-bis-terpyridine tetraphenyl ethylene, on a Cu(111) surface by low-temperature scanning tunneling microscopy (STM). Three distinctive supramolecular structures, metallacycles, propeller-shaped clusters and extended linear chains, are formed under specific assembly conditions owing to different inter-molecular binding modes o...

A concise synthetic protocol for aryl functionalized phenanthrolines has been developed. It was demonstrated that 3,8-diphenyl-1,10-phenanthroline (7a) is competent in promoting transition-metal-free direct arylation and 2,3,8,9-tetraphenyl-1,10-phenanthroline (8a) is a highly efficient ligand in the in situ Pd-catalysed Heck reaction.

Changes in urinary porphyrin excretion patterns (porphyrin profiles) have been described in response to a variety of drugs and chemicals. The present studies were conducted to define the specific changes in the urinary porphyrin profile associated with prolonged exposure to mercury and mercury compounds. In rats, exposure for a prolonged period to mercury as methyl mercury hydroxide was associa...

Wheat germ agglutinin (WGA) is the first studied plant lectin shown to bind more strongly to tumour cells than to normal ones. WGA interacts with prostate cancer cells, human pancreatic cells and colon-cancer cells. Our results showed the interaction of WGA with two porphyrin compounds Fe porphyrin and Pd porphyrin. The dissociation constants for the porphyrin binding was kD (0.08-1.02 μM) show...

Here, we used a fluorophore-bound, porphyrin-targeted DNA aptamer to increase the sensitivity of capillary electrophoresis for detection model porphyrin. The complex wit...

condensation of glyoxal, formaldehyde and anilines lead to the formation of 2,4,6,8- tetraphenyl and substituted phenyl 2,4,6,8-tetraazabicyclo [3.3.0] octanes. the reactions are sensitive to ph and temperature. ortho derivatives of anilines do not participate in this condensation. x-ray structural determination reveals a cis-dienvelope geometery about the two fused rings.