Issue 13, 1996

New rhenium complexes with phosphinite PPh2OR or phosphonite PPh(OR)2(R = Me, Et or Pri) ligands: synthesis and protonation of various polyhydrides

Abstract

The rhenium complexes [ReOCl3L2] and [ReCl3L3][L = PPh2OMe, PPh2OEt, PPh2OPri, PPh(OEt)2 or PPh(OPri)2] were prepared by allowing [ReOCl3(AsPh3)2] to react with the appropriate amount of phosphinite or phosphonite. Treatment of [ReCl3L3] with CO and p-MeC6H4NC afforded the mer-trans-[ReCl(CO)3L2] and [ReCl2(p-MeC6H4NC)4L]BPh4 complexes, respectively. Treatment of [ReOCl3L2] with NaBH4 gave [Re2H8L4], but in the presence of phosphinite or phosphonite the trihydrides [ReH3L4] were obtained. Treatment of [ReCl3L3] with NaBH4 gave instead pentahydride complexes [ReH5L3]. All the multihydrides were characterised as ‘classical’ species by variable-temperature NMR spectroscopy (1H and 31P) and T1 measurements. Protonation of [Re2H8L4] and [ReH3L4] with HBF4·Et2O gave the classical hydride cations [Re2H9L4]+ and [ReH4L4]+, respectively, while similar treatment of [ReH5L3] gave a species formulated as containing an η2-H2 ligand, [ReH42-H2)L3]+ on the basis of T1(min) evidence.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1996, 2779-2785

New rhenium complexes with phosphinite PPh2OR or phosphonite PPh(OR)2(R = Me, Et or Pri) ligands: synthesis and protonation of various polyhydrides

S. G. Fontán, A. Marchi, L. Marvelli, R. Rossi, S. Antoniutti and G. Albertin, J. Chem. Soc., Dalton Trans., 1996, 2779 DOI: 10.1039/DT9960002779

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