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'Dipyridyl' in keywords
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2001 (1)
1995 (1)
1Author    VictorA. Trush3, Jolanta Swiatek-Kozlowskab, VictorV. Skopenkoa, VladimirM. Amyrkhanov3Requires cookie*
 Title    A New Binuclear Lutetium(III) Dimethyl-N-trichloroacetylamidophosphate Complex with a 7 , 7 *-Dipyridyl Bridge, {Lu[CCl3C(0)N P(0)(0C H 3)2]3}2-A x(7,7'-dipy)  
 Abstract    A new type of binuclear coordination compound of lutetium, {Lu2L6 /i-(7 ,7 '-dipy)} (where L = dimethyl-N-trichloroacetylamidophosphate anion and 7 ,7 '-dipy = 4,4'-dipyridyl), has been obtained. The IR spectroscopic data reveal that the ambidentate phosphoryl ligand is coordinated to the metal center in a bidentate manner via the phosphoryl and carbonyl oxygen atoms. The crystal and molecular structure of {LniLö-^-(7 ,7 '-dipy)} has been determined by means of X-ray diffraction (triclinic, space group P i with parameters: a = 9.259(2), b = 12.530(3), c = 16.548(3) A, a = 85.44(3)°, ß = 75.64(3)°, 7 = 70.56(3)°, Z = 1). The structure is made up of centrosymmetric binuclear molecules, in which the neutral heterocyclic ligand is coordinated to the metal centers in a bidentate bridging manner via its nitrogen atoms. The coordination number of each Lu(III) atom is 7 [60(L~) + N((7 ,7 '-dipy)]. Phosphoryl and carbonyl groups of the L~ ligands are disposed in syn-position and are included in the six-membered chelate metallocycles. The coordination polyhedron of lutetium can be described as distorted mono-capped octahedron. 
  Reference    Z. Naturforsch. 56b, 249—254 (2001); received September 25 2000 
  Published    2001 
  Keywords    Lutetium, Carbacylamidophosphate, Dipyridyl 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0249.pdf 
 Identifier    ZNB-2001-56b-0249 
 Volume    56 
2Author    Uwe Rosenthal, Siegmar Pulst, PerditaA. Rndt, Wolfgang Baumann, Annegret Tillack, R. Hett KempeRequires cookie*
 Title    Zum Ligandeinfluß in neuen Ni(0)-Komplexen disubstituierter Butadiine On the Influence of Ligands in New Ni(0) Complexes of D isubstituted Butadiynes  
 Abstract    It has been shown that disubstituted butadiynes react with L2Ni(C2H 4) to yield m ono­ nuclear complexes L2Ni(?/2(l:2)-R C = C -C = C R) (L = o-T ol-0)3P, R = SiMe3 (1), 'Bu (2), Ph (3)). For the first time, the crystal structure of a nickel(O) alkyne complex carrying phosphite ligands (2) has been determined. The reaction of (dipy)Ni(cod) (L2 = dipy) with butadiynes R 'C = C -C = C R is strongly influenced by the substituents of the butadiyne. With R' = R = SiMe3 (4), 'Bu (5) and Ph (6) or R' = Ph, R = SiMe3 (7) and R ' = 'Bu, R = SiMe3 (8) mononuclear complexes (dipy)Ni(?72(l:2)-R 'C = C -C = C R) have been observed. Depending on the stoichiometry with R = R ' = Ph (9) and 'Bu (10) dinuclear complexes |(dipy)Ni}2(/<-?72(l:2),?72(3 :4)-R 'C = C -C = C R) having two Ni atoms coordinated to two C = C triple bonds were obtained. By contrast, with R ' = R = SiMe3 (11), R' = 'Bu, R = SiMe3 (12) and R' = Ph, R = SiMe3 (13) the two Ni-centers were found to coordinate to the same C = C triple bond to yield another type of a dinuclear complex {(dipy)Ni}2(w-?72(l:2),//2(l:2)-R 'C = C -C = C R). Com pound 5 has been characterized by X-ray crystal structure analysis. The structures of 2 and 5 are com pared to that of the well-known complex (Ph3P)2Ni(?72(l:2)-'B u C = C -C = C 'B u) [1] to study the influence of different ligands L on the structural details. In comparison to the alkyne complexes L2Ni(//2-R C = C R) in butadiyne complexes of the L2Ni(//2(l:2)-R 'C = C -C = C R) type there is only a slight effect of the different ligands. The uncomplexed C = C triple bond as a part of the second substi­ tuent in conjugation to the complexed C = C triple bond appears to level out the influence of ligands and substituents. 
  Reference    Z. Naturforsch. 50b, 368—376 (1995); eingegangen am 4. O ktober 1994 
  Published    1995 
  Keywords    Butadiyne, Phosphite, Dipyridyl, Crystal Structure, Nickel(O) Complexes 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0368.pdf 
 Identifier    ZNB-1995-50b-0368 
 Volume    50