| 词条 | Titanocene pentasulfide |
| 释义 |
| verifiedrevid = | ImageFile = Cp2TiS5imp.png | ImageSize = 150px | IUPACName = | OtherNames = titanocene pentasulfide |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|correct|CAS}} | CASNo = 12116-82-4 | RTECS = |Section2={{Chembox Properties | Formula = C10H10S5Ti | MolarMass = 338.382 | Appearance = red solid | Density = | Solubility = | MeltingPt = }} |Section3={{Chembox Structure | Coordination = Dist. tetrahedral | CrystalStruct = | Dipole = |Section7={{Chembox Hazards | ExternalSDS = | NFPA-H = | NFPA-F = | NFPA-R = | RPhrases = | SPhrases = }} |Section8={{Chembox Related | OtherCompounds = Zirconocene pentasulfide Titanocene dichloride}} }} 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. PreparationTitanocene pentasulfide is prepared by treating Cp2TiCl2 with polysulfide salts:[1] It was first produced by the addition of elemental sulfur to titanocene dicarbonyl:[2] (C5H5)2Ti(CO)2 + {{frac|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 Å and the S–S bond distances are of a normal range, 2.051–2.059 Å.[3] The molecule exhibits a dynamic NMR spectrum owing to the chair–chair equilibrium of the TiS5 ring which equivalizes the Cp signals at high temperatures.[4] ReactionsCp2TiS5 reacts with sulfur and selenium chlorides, ExCl2, to afford titanocene dichloride and various S5+x and S5Sex rings. Illustrative is the synthesis of S7 from disulfur dichloride:[5] (C5H5)2TiS5 + S2Cl2 → (C5H5)2TiCl2 + S7 It also reacts with alkenes and ketenes to give heterocycles composed of Ti, C and S. With trialkylphosphines, the cycle dimerize into rings of various sizes, depending on the trialkylphosphine used.[6] References1. ^{{cite journal|first1=Alan |last1=Shaver |first2=James M. |last2=Mccall |first3=Gabriela |last3=Marmolejo |title=Cyclometallapolysulfanes (and Selanes) of Bis(η5-Cyclopentadienyl) Titanium(IV), Zirconium(IV), Molybdenum(IV), and Tungsten(IV)|journal=Inorg. Synth. |date=1990 |volume=27 |pages=59–65 |DOI=10.1002/9780470132586.ch11}} {{Titanium compounds}}2. ^{{cite journal|title=π-Complexes of Group IVA metals with cyclopentadiene, indene, and fluorine |journal=Bull. Soc. Chim. France |date=1966 |volume= 11 |pages= 3548–64}} 3. ^{{cite journal|first1=E. F. |last1=Epstein |first2=I. |last2=Bernal |title=Pentachalcogenide dianions in transition-metal complexes: crystal structure of bis-(π-cyclopentadienyl)titanium pentasulphide |journal=J. Chem. Soc. D |date=1970| volume=1970|pages=410–411|DOI=10.1039/C29700000410}} 4. ^{{cite journal|first1=Alan |last1=Shaver |first2=James M. |last2=McCall |title=Preparation and Variable-Temperature NMR Studies of the Metallacyclosulfanes Cp2MS5 and (MeSCp)MS3, Where M = Ti, Zr, and Hf| journal=Organometallics |date=1984 |volume= 3 |pages= 1823–1829 | doi = 10.1021/om00090a008 }} 5. ^{{cite journal |title = Solid Sulfur Allotropes Sulfur Allotropes| first1 = Ralf |last1 = Steudel|first2 = Bodo|last2 = Eckert|journal = Topics in Current Chemistry |year = 2003 |volume = 230 |pages = 1–80 |doi = 10.1007/b12110}} 6. ^{{cite book| title = Advanced Inorganic Chemistry |edition=6th| first1 = F. Albert |last1=Cotton| first2 = Geoffrey |last2=Wilkinson| first3 = Carlos A. |last3=Murillo| first4 = Manfred |last4=Bochmann| publisher = Wiley| year = 1999| isbn = 978-0471199571}} 2 : Sulfides|Titanocenes |
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