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1Author    Z. NaturforschRequires cookie*
 Title    E nan tioselective Catalysis  
 Abstract    , 101 [1] Synthesis and C oordination Properties o f (3 'S ,4 'S)-(+)-l,2 -B is(3 ',4 '-d im eth o x y -p h osp h olan o)b en zene, a N ew Chiral D iphosphane H e n ri B ru n n e r* , G e m m a N e t A new bisphospholane, BDPB, derived from 1,2-bisphosphanobenzene and tartaric acid as well as the complex [Rh(CO D)(BD PB)]PF6 were syn­ thesized. The strong binding of BDPB to metals and the presence of four functional groups in the periphery of the molecule make this bisphospho­ lane a good starting point for new expanded bis­ phosphanes. 
  Reference    Z. Naturforsch. 51b, 1210—1212 (1996); received February 5. 1996 
  Published    1996 
  Keywords    Chiral Bisphosphanes Expanded Phosphanes, Rhodium Complexes, Cyclic Sulfates 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1210_n.pdf 
 Identifier    ZNB-1996-51b-1210_n 
 Volume    51 
2Author    Helmut Behrens, Jochen Ellermann, EwaldF. HohenbergerRequires cookie*
 Title    Dicarbonyl-, Carbamoyl-carbonyl-und Carbomethoxo-carbonyl-Komplexe des Rhodiums mit tri-und tetratertiären Phosphinliganden [1] Dicarbonyl-, Carbamoyl-carbonyl-and Carbomethoxo-carbonyl Complexes of Rhodium with Tri-and Tetratertiary Phosphine Ligands [1]  
 Abstract    The cationic dicarbonyl complexes [Rh(CO)2(R2PCH2)3CR']PF6 (R = C6H5; R' = CH3, -CH2PR2), formed by high pressure synthesis from RhCl3(H20)3, CO and (R2PCH2)3CR' react with liquid ammonia at 20 °C to give the carbamoyl complexes Rh(CO)(CONH2)(R2PCH2)3CR'. At 100 °C in liquid ammonia the carbamoyl-carbonyl complexes Rh(CO)(CONH2)(R2PCH2)3CR' form the CO-bridged, dinuclear compounds (^-CO)2[Rh(R2PCH2)3CR']2. Upon treatment of Rh(CO)(CONH2)(R2PCH2)3CR' with CH3OH the carbomethoxo carbonyl complexes Rh(CO)(COOCH3)(R2PCH2)3CR' are obtained. The new compounds were characterised, as far as possible, by their IR, Raman and 31 P NMR spectra. 
  Reference    Z. Naturforsch. 35b, 661—668 (1980); eingegangen am 10. Dezember 1979/30. Januar 1980 
  Published    1980 
  Keywords    Rhodium Complexes, Polytertiary Phosphines, IR Spectra, Raman Spectra, 31 P NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0661.pdf 
 Identifier    ZNB-1980-35b-0661 
 Volume    35 
3Author    Lutz Dahlenburg, Constanze Prengel, Nils HöckRequires cookie*
 Title    Oligophosphan-Liganden, XX [1] Reduktion von C 0 2 am Trisphosphanrhodium(I)-Komplex RhCl[f-BuP(CH2CH2CH2PMe2)2] Oligophosphine Ligands, X X [1] Reduction of Carbon D ioxide by the Trisphosphinerhodium (I) Complex RhCl[r-BuP(CH2CH2CH2PM e2)2]  
  Reference    Z. Naturforsch. 41b, 718—721 (1986); eingegangen am 28. Februar 1986 
  Published    1986 
  Keywords    C arbon Dioxide, Bis(3-dim ethylphosphinopropyl)fm -butylphosphine, Rhodium Complexes, NMR Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0718.pdf 
 Identifier    ZNB-1986-41b-0718 
 Volume    41 
4Author    Kenta Takahashi, Keisuke Umakoshi, Akihiro Kikuchi, Yoichi Sasaki, Masato Tominaga, Isao TaniguchiRequires cookie*
 Title      
 Abstract    New trinuclear rhodium(III) complexes, [Rh3(//3-0)(/i-CH3C00)6(L)3]+ (L = imidazole (Him), 1-methylimidazole (Meim), and 4-methylpyridine (Mepy)) have been prepared. The Him, Meim, and Mepy complexes show reversible one-electron oxidation waves at E1/2 = +1.12, +1.12, and +1.28 V vs Ag/AgCl, respectively, in acetonitrile. Electronic absorption spectra of the one electron oxidized species of these complexes and [Rh3(M3-0)(M-CH3C 0 0)6(py)3]+ (py = pyridine) (E 1 /2 = +1.32 V) were obtained by spectroelectrochemical techniques. While the Rh3(III,III,III) states show no strong visible absorption, the Rh3(III,III,IV) species give a band at ca. 700 nm (e = 3390-5540 mol dm" 3 cm" 1). [Ir3(«3-0)(//-CH3C00)6(py)3]+ with no strong absorption in the visible region, shows two reversible one-electron oxidation waves at +0.68 and +1.86 V in acetonitrile. The electronic absorption spectrum of the one-electron oxidized species (Ir3(III,III,IV)) also shows some absorption bands (688 nm (e, 5119), 1093 (2325) and 1400 (ca. 1800)). It is suggested that the oxidation removes an electron from the fully occupied anti-bonding orbital based on metal-d7r-/^3-0-pjr interactions, the absorption bands of the (III,III,IV) species being assigned to transitions to the a«r/-bonding orbital. esting because of their characteristic strong visible absorption and reversible multi-step redox behav­ iour [2-14]. It has been suggested that such char­ acteristic properties are associated with strong in-termetallic interactions through the central oxide bridge. The Ru(d^r)-^3 -0 (p jr) interaction is sig­ nificantly stronger than that of analogous tri­ nuclear complexes o f first row transition elements. The djr-pjr molecular orbitals shown in Fig. 1 have been proposed for the trinuclear ruthenium complexes [3,15,16], In the study of mixed ruthe-nium-rhodium complexes, it was suggested that a similar molecular orbital scheme should be appli­ cable to trirhodium and mixed ruthenium-rho-dium complexes [7]. Electronic states o f the oxo-centered triiridium (III) complexes [17,18] should also be considered in terms of the djr-pjr molec­ ular orbital scheme. Thus the oxo-centered tri­ metal complexes of heavy transition elements could be significantly different from those of first row transition elements with respect to the extent of metal-oxygen-metal interactions. The trinuclear 
  Reference    Z. Naturforsch. 50b, 551—557 (1995); received October 5 1994 
  Published    1995 
  Keywords    Trinuclear Complexes, Rhodium Complexes, Iridium Complexes, dn-ipji Interaction, Spectroelectrochemistry, Mixed Valence State 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0551.pdf 
 Identifier    ZNB-1995-50b-0551 
 Volume    50