6418-49-1Relevant academic research and scientific papers
Preparation and characterization of substituted pentaarylcyclopentadienyliron dicarbonyl bromide complexes containing methyl or fluorine substituents on the arene rings
Thépot, Jean-Yves,Lapinte, Claude
, p. 146 - 155 (2007/10/03)
The bromopentaarylcyclopentadienes C5(C6H5)4(Ar′)(Br) (Ar′ = 3,5-C6H3Me2, 1a3; Ar′ = 2,4,6-C6H2Me3, 1a5; Ar′ = 3,4-C6H3Fsu
Decaphenylgermanocene, -stannocene and -plumbocene, 5-(C6H5)5>2EII (E=Ge, Sn, Pb) and the X-ray crystal and molecular structure of pentaphenylstannocene, η5-(C6H5)5C5SnC5H5-ε5
Heeg, Jane Mary,Herber, Rolfe H.,Janiac, Christoph,Zuckerman, Jerold J.,Schumann, Herbert,Manders, William F.
, p. 321 - 332 (2007/10/02)
The - anion reacts with GeI2, SnCl2 or Pb(O2CCH3)2 in etheral solvents to form the sanwich compounds 5-(C6H5)5>2EII (E=Ge(III), Sn(I) and Pb(IV)) in 60, 73 and 54percent yields, respectively.The infusible air- and water-stable products (off-white, bright-yellow and deep-red colored, respectively) exhibit a weak parent ion in the mass spectrum plus the + cation (100percent) and + and +.The E=Pb derivative (IV) is thermochromic.The A1u νasym ring-metal stretch at 153, 138 and 134 cm-1 in the Raman for III, I and IV, respectively.Pentaphenylstannocene (II) is formed in 23 percentyield from η-cyclopentadienyltin(II) chloride as light-yellow, monoclinic platelets which are moderately air-stable, decomposing at 150 deg C.The mass spectrum exhibits a weak parent ion plus the equally abundant + and + cations.The 119mSn Mossbauer spectra at 78K of deca- (I) and pentaphenylstannocene (II) (IS=3.75, 3.67, QS=0.583, 0.868 mm s-1, respectively) are similar to other stannocenes.Pentaphenylstannocene (II), C40H30Sn, crystallizes with a molecule of toluene in the space group P21/c with a 13.357(5), b 10.139(3), c 26.967(5) Angstroem, β 100.96(2) deg, V 3585(2) Angtroem3, Z=4, ρcalc 1.336 g cm-3.The structure was determined at 138(2) K using Mo-Kα radiation to a final conventional R value of 0.038 and Rw of 0.045 for 5520 observed reflections.The molecule is bent through 151.1(2) deg between the tin vectors to the pentaphenylcyclopentadienyl (2.487(5) Angstroem) and cyclopentadienyl (2.391(5) Angstroem) ring centroids.The phenyl groups are not antiparallel to their cyclopentadienyl ring.
13C, 19F and 1H ENDOR Investigations of Substituent Effects on Lifting of Orbital Degeneracy in Cyclopentadienyl Radicals. Syntheses
Kieslich, W.,Kurreck, H.
, p. 4328 - 4335 (2007/10/02)
A variety of substituted, partially deuterated, and 13C-labeled pentaphenylcyclopentadienyl radicals ("Ziegler's radicals") have been synthesized.It is shown from 13C, 19F, and 1H ENDOR experiments that monosubstitution removes the orbital degeneracy of t
