Formation and Structure of Bis(Diphenyl-Phosphino)Ethane Bis(Indenyl)Molybdenum(II), A Compound with one η3 and one η5 Indenyl Ligand

Rinaldo Poli (1) , Sundeep P Mattamana (1) , Larry R Falvello (2)

1 University of Maryland [College Park]
2 University of Zaragoza - Universidad de Zaragoza [Zaragoza]

The interaction between MoI3(dppe)(THF) [dppe = bis(diphenylphosphino)ethane] and excess C9H7Na (indenylsodiurn) produces (η-C9H7)2Mo(dppe), which has been characterized by X-ray diffraction as toluene solvate. Crystal data for (η-C9H7)2Mo(dppe)·1/2C7H5: monoclinic, space group I2/a, a = 20.333(3), b =15.507(2), c = 24.543(3) Å, β = 105.09(1)°, V = 7472(2) Å3, Z = 8, dc = 1.370 g cm-3, µ (Mo-Kα) = 4.67 cm-1, R = 0.0293, Rw = 0.0394 for 641 parameters and 3757 data with Fo2 ≥ 3σ (Fo2). The structure shows that each indenyl ring is bonded to the Mo atom through the five-membered ring, but although one ring adopts the η5 bonding mode, the other is “slipped to achieve a conformation with only three carbon atoms directly attached to the metal (η3 bonding mode). The two rings rapidly exchange in solution on the NMR time scale and the exchange cannot be frozen out by cooling to -90 °C.

Domaines: Chimie de coordination; Cristallographie

Rinaldo Poli, Sundeep P Mattamana, Larry R Falvello. Formation and Structure of Bis(Diphenyl-Phosphino)Ethane Bis(Indenyl)Molybdenum(II), A Compound with one η3 and one η5 Indenyl Ligand. Gazzetta Chimica Italiana, 1992, 122, pp.315-319. ⟨hal-03534629⟩