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Issue 42, 2007
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Silver(i)-organophosphane complexes of electron withdrawing CF3- or NO2-substituted scorpionate ligands§

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Abstract

New silver(I) complexes have been synthesized from the reaction of AgNO3, monodentate tertiary phosphanes PR3 (PR3 = P(C6H5)3, P(o-C6H4CH3)3, P(m-C6H4CH3)3, P(p-C6H4CH3)3, PCH3(C6H5)2) and two novel electron withdrawing ligands: potassium dihydrobis(3-nitropyrazol-1-yl)borate and potassium dihydrobis(3-trifluoromethylpyrazol-1-yl)borate. These compounds have been characterized by elemental analyses, FT-IR, ESI-MS and multinuclear (1H, 19F and 31P) NMR spectroscopy. Solid state structures of the potassium salts K[H2B(3-(NO2)pz)2] and K[H2B(3-(CF3)pz)2] have been reported. They form polymeric networks due to intermolecular contacts of various types between the potassium ion and atoms of the neighboring molecules. The silver adducts [H2B(3-(NO2)pz)2]Ag[P(C6H5)3]2 and [H2B(3-(NO2)pz)2]Ag[P(p-C6H4CH3)3] have pseudo tetrahedral and trigonal planar silver sites, respectively. The bis(pyrazolyl)borate ligand acts as a κ2-N2 donor. The nitro-substituents are coplanar with the pyrazolyl rings in all these adducts indicating efficient electron delocalization between the two units. The [H2B(3-(CF3)pz)2]Ag[P(C6H5)3] complex has been obtained from re-crystallization of {[H2B(3-(CF3)pz)2]Ag[P(C6H5)3]2} in a dichloromethane–diethyl ether solution; it is a three-coordinate, trigonal planar silver complex.

Graphical abstract: Silver(i)-organophosphane complexes of electron withdrawing CF3- or NO2-substituted scorpionate ligands

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Supplementary files

Article information


Submitted
04 Jun 2007
Accepted
13 Aug 2007
First published
23 Aug 2007

Dalton Trans., 2007, 4845-4853
Article type
Paper

Silver(I)-organophosphane complexes of electron withdrawing CF3- or NO2-substituted scorpionate ligands

M. Pellei, S. Alidori, G. Papini, G. G. Lobbia, J. D. Gorden, H. V. R. Dias and C. Santini, Dalton Trans., 2007, 4845
DOI: 10.1039/B708436F

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