10.1016/S0040-4039(98)02135-2
The research aimed to chemically synthesize two analogues of the calicheamicin oligosaccharide, which is crucial for drug-DNA interaction and the selectivity and specificity of DNA cleavage. The study focused on the roles of carbohydrate rings D and E, the aromatic ring-C, and the β-N-O glycosidic bond on DNA-drug recognition events. The researchers reported the total synthesis of oligosaccharides 1 and 2, which replaced carbohydrate ring E with a basic chain E', either with or without the rhamnopyranosyl unit D. Key chemicals used in the synthesis process included 2,2,2-trifluoroethanesulfonyl chloride, benzoyl chloride, trifluoroethanesulfonate ester, 1,4-dibromobutane, sodium hydride, ethylamine, Fmoc-protected amine, sodium borohydride, boron trifluoride, and various other reagents and solvents. The synthesized oligosaccharides showed some binding to double-stranded DNA, but solubility issues prevented a detailed study. The work was financially supported by the Ministère de l'Enseignement Supérieur et de la Recherche and involved collaboration with experts in the field.
10.1016/j.inoche.2010.02.016
The study focuses on the synthesis, crystal structure, and photophysical properties of a novel Pt(II) complex with a multi-functionalized cyclometalating ligand. The complex, [(L)PtCl] (HL=4-{p-[N-(4-(9-carbazole))butyl-N-phenyl]aniline}-6-phenyl-2,2′-bipyridine), was synthesized using various chemicals including carbazole, 1,4-dibromobutane, 4-(p-bromophenyl)-6-phenyl-2,2′-bipyridine, aniline, and K2PtCl4. The ligand HL was designed to integrate a carbazole unit and an arylamine-modified [(C^N^N)PtCl] emissive center, aiming to simplify the production process of OLEDs and study the interaction between these components. The crystal structure of the complex was determined by X-ray crystallography, revealing a distorted square planar configuration around the Pt atom and a 2D lamellar packing system. The complex exhibits strong metal-to-ligand charge transfer (1MLCT) transitions and phosphorescence, with an intramolecular energy transfer process from the carbazole unit to the emissive center. The study also includes the absorption and emission spectra of the ligand and complex, highlighting their potential applications in organic light-emitting diodes.