摘要:
The invention provides a silicon nanoparticle formation method that can rapidly produce substantial quantities of silicon nanoparticles, which are readily recoverable for subsequent uses. A preferred method includes treating a silicon substrate with hexachloroplatinic acid and etching the silicon substrate with HF/H 2 O 2 to form silicon nanoparticles on the surface of the silicon. Preferred methods of the invention use a cathodization of silicon source material in hexachloroplatinic acid/HF/H 2 O 2 to form Si nanoparticles. Other embodiments use a currentless immersion of silicon material in hexachloroplatinic acid followed by etching. In preferred embodiments of the invention, the silicon source material is a silicon substrate, e.g., a silicon wafer.
摘要:
This invention relates to certain novel pyrido[2,3- f ]quinoxaline-8-carboxylic acid derivatives, their isomeric pyrido[2,3- g ]quinoxaline-carboxylic acid derivatives, corresponding 4-oxo-1,4-dihydroquinoline-3-carboxylate derivatives of formulas (A) and (B) and physiologically tolerated salts and esters thereof, a process for their preparation and their potential use as antibacterial compounds.
摘要:
2-methyl-5-nitro-imidazolyl compounds with the general formula I, II or III:
wherein one of the groups R 1 , R 2 , R 3 , R 4 , R 5 is selected from an aldehyde and a 5- or 6-membered aromatic heterocylic group having 1 to 3 heteroatoms selected from N, O, S wherein the aromatic heterocylic group is optionally substituted and is optionally fused with a benzene ring that is optionally substituted; and each of the other groups R 1 , R 2 , R 3 , R 4 , R 5 is independently selected from hydrogen, alkyl, alkenyl, alkoxy, amino, alkylamino, dialkylamino, aryl, aralkyl, carboxyl, carboxylic ester, cyano, amido, bromo, chloro, fluoro, alkylamido and heterocyclic optionally substituted; R 6 is selected from - SO 2 -R 16 , -(CH 2 ) n -R 17 ; R 16 is a heterocylic group optionally substituted; R 17 is a heterocylic group optionally substituted; n is selected from 1 to 5; R 7 is selected from C2-C10 alkyl, aryl optionally substituted, heterocyclic optionally substituted, alkenyl and C2-C4 hydroxyalkyl; R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 are each independently selected from hydrogen and alkyl; the optionally substituted aryl, heterocyclic, aromatic heterocyclic groups and benzene rings are optionally substituted with one or more groups independently selected from alkyl, alkenyl, alkoxy, amino, alkylamino, dialkylamino, carboxyl, carboxylic ester, cyano, amido, bromo, chloro, fluoro and alkylamido. These compounds are used as antiparasitic and antibacterial agents.
摘要:
2-methyl-5-nitro-imidazolyl compounds with the general formula I, II or III:
wherein one of the groups R 1 , R 2 , R 3 , R 4 , R 5 is selected from an aldehyde and a 5- or 6-membered aromatic heterocylic group having 1 to 3 heteroatoms selected from N, O, S wherein the aromatic heterocylic group is optionally substituted and is optionally fused with a benzene ring that is optionally substituted; and each of the other groups R 1 , R 2 , R 3 , R 4 , R 5 is independently selected from hydrogen, alkyl, alkenyl, alkoxy, amino, alkylamino, dialkylamino, aryl, aralkyl, carboxyl, carboxylic ester, cyano, amido, bromo, chloro, fluoro, alkylamido and heterocyclic optionally substituted; R 6 is selected from - SO 2 -R 16 , -(CH 2 ) n -R 17 ; R 16 is a heterocylic group optionally substituted; R 17 is a heterocylic group optionally substituted; n is selected from 1 to 5; R 7 is selected from C2-C10 alkyl, aryl optionally substituted, heterocyclic optionally substituted, alkenyl and C2-C4 hydroxyalkyl; R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 are each independently selected from hydrogen and alkyl; the optionally substituted aryl, heterocyclic, aromatic heterocyclic groups and benzene rings are optionally substituted with one or more groups independently selected from alkyl, alkenyl, alkoxy, amino, alkylamino, dialkylamino, carboxyl, carboxylic ester, cyano, amido, bromo, chloro, fluoro and alkylamido. These compounds are used as antiparasitic and antibacterial agents.