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Issue 48, 2007
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Dinuclear PCP pincer complexes from Lewis acidic [Pd(OTf)(PCP)] and basic [Pd(4-Spy)(PCP)] (OTf = triflate; 4-Spy = 4-pyridinethiolate; PCP = CH(CH2CH2PPh2)2)

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Abstract

The Lewis acidic pincer with a labile triflate ligand, viz. [Pd(OTf)(PCP)] (PCP = CH(CH2CH2PPh2)2) 1 was prepared from [PdCl(PCP)] with AgOTf. It reacts readily with neutral bidentate ligands [L = 4,4′-bipyridine (4,4′-bpy) and 1,1′-bis(diphenylphosphino)ferrocene (dppf)] to give dinuclear PCP pincers [{Pd(PCP)}2(μ-L)][OTf]2 (L = 4,4′-bpy, 2; dppf, 3). [PdCl(PCP)] also reacts with 4-mercaptopyridine in the presence of KOH to give a Lewis basic pincer with a free pyridine functional group [Pd(4-Spy)(PCP)] 4. Its metalloligand character is exemplified by the isolation of an asymmetric dinuclear double-pincer complex [{Pd(PCP)}2(μ-4-Spy)][PF6] 6 bridged by an ambidentate pyridinethiolato ligand. Complexes 1, 2, 3, 4 and 6 have been characterized by single-crystal X-ray diffraction analyses.

Graphical abstract: Dinuclear PCP pincer complexes from Lewis acidic [Pd(OTf)(PCP)] and basic [Pd(4-Spy)(PCP)] (OTf = triflate; 4-Spy = 4-pyridinethiolate; PCP = −CH(CH2CH2PPh2)2)

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Publication details

The article was received on 13 Jul 2007, accepted on 19 Sep 2007 and first published on 11 Oct 2007


Article type: Paper
DOI: 10.1039/B710752H
Dalton Trans., 2007, 5701-5709

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    Dinuclear PCP pincer complexes from Lewis acidic [Pd(OTf)(PCP)] and basic [Pd(4-Spy)(PCP)] (OTf = triflate; 4-Spy = 4-pyridinethiolate; PCP = CH(CH2CH2PPh2)2)

    K. E. Neo, H. V. Huynh, L. L. Koh, W. Henderson and T. S. A. Hor, Dalton Trans., 2007, 5701
    DOI: 10.1039/B710752H

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