|
|Section2= |Section3= |Section7= |Section8= }} Titanocene pentasulfide is the organotitanium compound with the formula (C5H5)2TiS5, commonly abbreviated as Cp2TiS5. This metallocene exists as a bright red solid that is soluble in organic solvents. It is of academic interest as a precursor to unusual allotropes of elemental sulfur as well as some related inorganic rings. ==Preparation== Titanocene pentasulfide is prepared by treating Cp2TiCl2 with polysulfide salts:〔 Alan Shaver, James M. Mccall, Gabriela Marmolejo, "Cyclometallapolysulfanes (and Selanes) of Bis(η5-Cyclopentadienyl) Titanium(IV), Zirconium(IV), Molybdenum(IV), and Tungsten(IV)" Inorganic Syntheses, 1990, Vol. 27, pp. 59–65. 〕 It was first produced by the addition of elemental sulfur to titanocene dicarbonyl:〔"pi-Complexes of Group IVA metals with cyclopentadiene, indene, and fluorine" Bulletin de la Societe Chimique de France 1966, vol. 11, pp. 3548-64. 〕 :(C5H5)2Ti(CO)2 + 5/8 S8 → (C5H5)2TiS5 + 2 CO The complex is viewed as a pseudotetrahedral complex of Ti(IV). The Ti-S distances are 2.420 and 2.446 A and the S-S bond distances are of a normal range, between 2.051 to 2.059 Å.〔E. F. Epstein, I. Bernal "Pentachalcogenide dianions in transition-metal complexes: crystal structure of bis-(π-cyclopentadienyl)titanium pentasulphide" J. Chem. Soc. D, 1970, 410-411. 〕 The molecule exhibits a dynamic NMR spectrum owing the chair-chair equilibrium of the TiS5 ring which equivalences the Cp signals at high temperatures.〔Alan Shaver, James M. McCall "Preparation and Variable-Temperature NMR Studies of the Metallacyclosulfanes Cp2MS5and (MeSCp),MS3, Where M = Ti, Zr, and Hf" Organometallics 1984, vol. 3, pp. 1823-1829. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「titanocene pentasulfide」の詳細全文を読む スポンサード リンク
|