Concepedia

Transition metal-mediated discrimination between diastereoisomers of a new linear P<sub>2</sub>N<sub>2</sub>ligand, L<sub>1</sub>; X-ray structure analysis of rac-L<sub>1</sub>, [Pt(rac-L<sub>1</sub>)Cl]Cl·2H<sub>2</sub>O, and an unusual Rh<sup>I</sup>dimer [Rh<sub>2</sub>(rac-L<sub>1</sub>–H)<sub>2</sub>(CO)<sub>2</sub>]·2H<sub>2</sub>O

Christopher W. G. Ansell, Mervyn K. Cooper, Keith P. Dancey, Paul A. Duckworth, Kim Henrick, Mary McPartin, Gregory J. Organ, Peter A. Tasker

Journal of the Chemical Society Chemical Communications · 1985 · 17 citations · 0 references

DOI

Concepts

Abstract

The new linear P2N2 ligand 1,3-bis{(o-aminophenyl)phenylphosphino}propane, L1, as syntheisised by reaction of (o-amonopheynyl)diphenylphosphine, L2, with lithium and 1,3-dichloropropane, forms racemic and meso isomer with distinctly different stereochemical requirements so that on reaction with PtCl2Y2(Y = dimethyl sulphoxide, DMSO, or benzonitrile) they bond in tridentate and tetradentate modes respectively to give the monocationic complex [Pt(rac-L1)Cl]+, (1), and the dicationic complex [Pt(meso-L1)]2+, (2); X-ray structure analysis of rac-L1, the chloride salt of (1), and the ligand bridged dimer [Rh2(rac-L1–H)2(CO)2], (3), has shown how the stereochemical requirements of this racemic ligand lead to unusual modes of co-ordination.