|Zirconocene pentasulfide. titanocene dichloride|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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.
- (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. The molecule exhibits a dynamic NMR spectrum owing the chair-chair equilibrium of the TiS5 ring which equivalences the Cp signals at high temperatures.
- (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.
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