Reference

Polymerization of methyl methacrylate by ammonium hexachlororhodate(III)

Polymerization of methyl methacrylate by ammonium hexachlororhodate(III). Khan, M. M. Taqui; Anwaruddin, Q. (Dep. Chem., Indian Inst. Technol., Madras, India). Indian J. Chem., Sect. A, 15A(1), 38-40 (English) 1977. CODEN: IJCADU. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The rate of polymn. of Me methacrylate [80-62-6] in the presence of ammonium hexachlororhodate(III) [15336-18-2] catalyst was proportional to [monomer]2.5 and to [catalyst]-0.35, indicating the catalyst effectively terminated the chain reaction. The rate of polymn. increased as the water content of the H2O-EtOH reaction medium increased reaching a max. at 33.3% H2O and then decreased.

Cyto- and genotoxic effects of coordination complexes of platinum, palladium, and rhodium in vitro

Cyto- and genotoxic effects of coordination complexes of platinum, palladium, and rhodium in vitro. Buenger, Juergen; Stork, Joachim; Stalder, Karlheinz (Center Environmental Occupational Medicine, Georg-August University, Goettingen D-37073, Germany). International Archives of Occupational and Environmental Health, 69(1), 33-38 (English) 1996 Springer. CODEN: IAEHDW. ISSN: 0340-0131. DOCUMENT TYPE: Journal CA Section: 59 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 4, 51, 67 Cytotoxic and mutagenic properties of industrially used coordination complexes of Pt, Pd, and Rh were studied by the neutral red cytotoxicity assay on 2 cell lines and the Salmonella typhimurium/microsome test system (Ames test).Some commonly used reagents like 13820-41-2 and 15336-18-2 are used in this experiment. Cytotoxic effects of Pt complexes measured as ED50 occurred at test concns. of 0.2 mM. ED50 of the analogous Pd and Rh salts were 0.6 and 6 mM, resp. Toxicity levels of of the different complexes did not differ from each other indicating the metal itself was responsible for toxicity effects. In the Ames test, spontaneous mutation rates increased by factors of 3-20 when the tester strains were exposed to Pt complexes, whereas Rh compds. were considerably less mutagenic, and Pd revealed no mutagenic potential. The mutagenic potential of Pt and Rh complexes is based on a variety of mechanisms that damage DNA. Water-sol. Rh complexes are less toxic and have smaller mutagenic potential than analogous Pt complexes. Catalytic converters contg. Pd are a possible means of minimizing health risks in exhaust detoxification technique. .