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A dipyrromethane-based diphosphane–germylene as precursor to tetrahedral copper(I) and T-shaped silver(I) and gold(I) PGeP pincer complexes

Abstract

A six-membered ring N-heterocyclic germylene flanked by two CH2PiPr2 groups, Ge(pyrmPiPr2)2CMe2 (1; (HpyrmPiPr2)2CMe2 = 5,5-dimethyl-1,9-bis(di-isopropylphosphanylmethyl)dipyrromethane), has been prepared in high yield. Upon treatment with group 11 metal precursors of the type [MCl(PPh3)]n (M = Cu (n = 4), Ag (n = 4), Au (n = 1)), germylene 1 easily forms a PGeP chloridogermyl ligand that is able to stabilize tetrahedral copper(I) and unusual T-shaped silver(I) and gold(I) PGeP pincer complexes, as has been demonstrated by the isolation of [Cu{3P,Ge,P-GeCl(pyrmPiPr2)2CMe2}(PPh3)] (2) and [M{3P,Ge,P-GeCl(pyrmPiPr2)2CMe2}] (M = Ag (3), Au (4)). Theoretical calculations have shown that the Ge–M bonds of these complexes are weak and that their strength decreases in the series 2 > 3 > 4.

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Publication details

The article was received on 25 Jul 2019, accepted on 29 Jul 2019 and first published on 30 Jul 2019


Article type: Paper
DOI: 10.1039/C9DT03045J
Dalton Trans., 2019, Accepted Manuscript

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    A dipyrromethane-based diphosphane–germylene as precursor to tetrahedral copper(I) and T-shaped silver(I) and gold(I) PGeP pincer complexes

    J. A. Cabeza, I. Fernandez, P. García-Álvarez and C. J. Laglera Gándara, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT03045J

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