摘要:
Substituted carboxylic ceto-acids having the formula I (FORMULA) wherein R1 represents a hydrogen atom, a halogen atom, a hydroxyl group, a lower alkyl, lower alkyloxy or trifluoromethyl residue. R2 represents a hydrogen or halogen atom and n represents an integer from 3 to 8. These acids, as well as the salts thereof exhibit an hypoglycemic activity when applied to living homeothermic organisms. Preparation processes for these new compounds and intermediate compounds of the synthesis thereof are described. A preparation of medicinal compositions containing such acids or the salt thereof is also referred to.
摘要:
This invention is directed to filtration system, filtration apparatus and methods of use thereof, wherein the filtration system comprises a solid support, perylene diimide based membrane layer and a polymer, specifically a Nafion polymer. The system and apparatus of this invention enables filtration of solutes such as: dyes, salts, heavy metal ions, pharmaceuticals and small organic molecules.
摘要:
Metal complex of Nickel (II) containing a dithio-based ligand have been synthesized and char¬ acterized by elemental analysis, mass spectrometry, Proton NMR and FT-IR spectrometry. A single crystal X-ray structure of the cadmium complex has been analyzed. The metal complex was subjected to biological tests on falcipain-2 (FP-2) and falcipain-3 (FP-3) cysteine protease enzymes from the malaria parasite Plasmodium falciparum. They were further tested in vitro against chloroquine resistant strain (W2). Whereas the potency of the metal complexes was weaker than the control regarding the FP-2 and FP-3, the potency of metal complexes was found to be exceedingly greater than the control when tested against the chloroquine resistant strain (W2) with a strength ratio of (1.4). This paper describes the synthesis, characterization and biological results of the said metal complex containing deprotonated 3-[l-(2-pyridyl) ethylidene] hydrazinecarbodithioate ligand (Fig. 1).
摘要:
A method of preparing high purity dimethyl cadmium or dimethyl zinc suitable for use in the deposition of Group II-VI epitaxial layers, which consists of forming an adduct of the metal alkyl with a non-chelating tertiary amine containing at least two tertiary amino groups per amine molecule, and subsequently dissociating the adduct to liberate the metal alkyl as a vapour. The adducts formed during the preparative method are found to dissociate readily on heating and yet are substantially involatile and so do not contaminate the liberated metal alkyl. A preferred amine suitable for use in the preparative method is 4,4' bipyridyl.
摘要:
The tristhiourea tripodal metal complexes are a group of coordination compounds having a transition metal linked by coordinate covalent bods to a chelating agent. The chelating agent has a tris-(6-amino-2-pyridylmethyl)amine (TAPA) backbone and three thiourea ligands bonded to the three legs of the TAPA backbone, respectively. The transition metal bonds to the amino groups of the TAPA backbone, and the thiourea ligands hydrogen bond to the anion guest remote from the transition metal. The chelating agent has a symmetrical C 3v tripodal cavity that is selective for tetrahedral anions. The transition metal is selected from the group consisting of cadmium, manganese, cobalt, nickel, copper, and zinc. The tristhiourea tripodal metal complexes may be used in colorimetric sensors, selectively permeable membranes, filtration media for separating tetrahedral anions (such as phosphate and perchlorate) from mixtures, and similar applications.
摘要:
This invention is directed to separation, optimization and purification of nano-materials using recyclable membranes of self-assembled perylene diimide derivatives.