Pentamethylcyclopentadienylrhodium Complexes with Tripoid Tetradentate Ligands and Bidentate 'Mixed' Ligands

DOI: 10.1039/DT9820001147

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1147 - 1154 (1982)

Update date:2022-09-26

Topics:

Authors:

Stoppioni, Piero

Vaira, Massimo Di

Maitlis, Peter M.

Read Full Text PDF DownLoad Join now for total 90,000,000 free articles

Article abstract of DOI:10.1039/DT9820001147

The synthesis and properties of the complexes <3Cl5L>Y , obtained from and the appropriate tripodal tetradentate ligands, L=N(CH2CH2PPh2)3 or P(CH2CH2PPh2)3, are reported.These monoligand trimetallic compounds contain two Rh(C5Me5)Cl2 units each bound to a terminal phosphorus atom of the tripod ligand and a Rh(C5Me5)Cl group linked to the third terminal phosphorus and to the apical donor atom, nitrogen for N(CH2CH2PPh2)3, phosphorus for P(CH2CH2)3.The Rh(C5Me5)Cl group in the N(CH2CH2PPh2)3 derivative undergoes substitution when treated with tetrabutylammonium chloride to give <3>.The influence of steric factors in the substitution reaction has been investigated by synthesising and characterising the complexes >BPh4 (n=2, R=Ph or C6H11, R'=H, Me or Et; n=3, R=Ph, R'=H, Me or Et; R=C6H11, R'=H or Me).The bidentate mixed ligands R'2N(CH2)nPPh2 (n=2, R'=Et; n=3, R'=Me or Et) give complexes of formula 2>BPh4, in which the ligands are monodentate through the phosphorus atom.The crystal structure of 2>BPh4 has been determinated by X-ray crystallographic analysis.The complexes 2>BPh4 (n=2, R'=Et; n=3, R'=Me) exist as four rotamers due to restricted rotations of the bulky phosphine substituents about the Rh-P bonds, as shown by low-temperature 31P n.m.r. spectroscopy.