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1999 (1)
1982 (1)
1Author    Lutz Dahlenburg, Fazlollah Mirzaei, Ah YardimciogluRequires cookie*
 Title    Alkyl-und Arylkomplexe des Iridiums und Rhodiums  
 Abstract    , IX [1] Organorhodiumverbindungen Rh(R)(CO)(PPh3)2 (R = Alkyl, Aryl) und homologe Iridiumalkyle Alkyl and Aryl Complexes of Iridium and Rhodium, IX [1] Organorhodium Compounds Rh(R)(CO)(PPh3)2 (R = Alkyl, Aryl) and Related Iridium Alkyls A series of organorhodium and -iridium complexes M(R)(CO)(PPh 3)2 (M = Rh: R = CeHs, 2-MeC6H4, 4-MeC6H4, 2,4,6-Me3C6H2, CH3, CH2SiMe3, CH2CMe3; M = Ir: R = CH3, CH2Ph, CH2SiMe3, CH2CMe3) has been prepared from MCl(CO)(PPh3)2 and the correspond-ing organolithium or Grignard reagents. Of these compounds, the mesitylrhodium complex Rh(2,4,6-Me3C6H2)(CO)(PPh3)2 as well as the iridium and rhodium alkyls with Me3SiCH2 and Me3CCH2 ligands show cis,irans-isomerism which is demonstrated on the basis of infrared and NMR spectroscopic evidence. 
  Reference    Z. Naturforsch. 37b, 310—317 (1982); eingegangen am 23. Oktober 1981 
  Published    1982 
  Keywords    Rhodium, Iridium, Organometallic Compounds, eis, frarw-Isomerism, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0310.pdf 
 Identifier    ZNB-1982-37b-0310 
 Volume    37 
2Author    Janina Kuczera3, TeresaE. Krai3, Marian Podolakb, Stanislaw Przestalski3Requires cookie*
 Title    A Joint Effect of Cationic and Anionic Amphiphilic Compounds on the Desorption of Calcium Ions from Lecithin Liposome Membranes  
 Abstract    The aim of the work was to determine the synergism and antagonism of mixtures of the cationic amphiphilic compounds: N-benzyl-N,N-dimethyl-N-tetradecylammonium chloride (BD TA), N-benzyl-N,N-dimethyl-N-dodecylammonium chloride (B D D A), N-methyl-N-te-tradecyl-morpholinium bromide (M TM), N,N,N-trimethyl-N-tetradecylammonium bromide (TM TA) and those of tripropyltin chloride in a mixture with amphiphilic anionic compounds (a homologous series of sodium alkylsulfonates with n = 2, 4, 6, 8, 10, 12 and 14 alkyl carbon atoms) in the process of calcium ion desorption from liposome lecithin membranes. Radioac­ tive labels and spin labels were used in the investigations. All compounds studied caused an increase in the kinetic rate constant of calcium ion desorption from liposome membranes with increasing concentration. In case of mixtures containing cationic and anionic compounds both synergism and antagonism were observed. It was shown that the regulatory effect depended on the properties of both cationic and anionic compounds. A mixture of the most effective cationic compound (BD TA) with each of the anionic compounds decreased the effect. Mixtures of the remaining ammonium com­ pounds with sodium alkylsulfonates produced both synergism and antagonism. Anionic com­ pounds with short chains increased, and with longer chains decreased efficiency, while com­ pounds with comparable chains caused totally blocked desorption. A mixture of an organometallic compound having three short chains with anionic compounds gave a reversed effect: short-chain compounds caused a decreased and those with long-chains -increased efficiency of tripropyltin chloride. Studies with spin labels supported the conclusion that the most important factor responsi­ ble for the regulatory effect is the molecular shape of the complexes formed in a mixture of both groups of compounds -a factor that determines membrane packing density 
  Reference    Z. Naturforsch. 54c, 429 (1999); received November 23 1998/February 12 1999 
  Published    1999 
  Keywords    Ca2+ Desorption, Liposomes, Amphiphiles, Organometallic Compounds, Regulatory Effect 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0429.pdf 
 Identifier    ZNC-1999-54c-0429 
 Volume    54