| 17955136 |
Pellei M, Alidori S, Papini G, Lobbia GG, Gorden JD, Dias HV, Santini C: Silver (I)-organophosphane complexes of electron withdrawing CF3- or NO2-substituted scorpionate ligands. Dalton Trans. 2007 Nov 14;(42):4845-53. Epub 2007 Aug 23.
New silver (I) complexes have been synthesized from the reaction of AgNO (3), monodentate tertiary phosphanes PR (3) (PR (3) = P (C (6) H (5))(3), P (o-C (6) H (4) CH (3))(3), P (m-C (6) H (4) CH (3))(3), P (p-C (6) H (4) CH (3))(3), PCH (3)(C (6) H (5))(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 ((1) H, (19) F and (31) P) NMR spectroscopy. Solid state structures of the potassium salts K [H (2) B (3-(NO (2)) pz)(2)] and K [H (2) B (3-(CF (3)) 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 [H (2) B (3-(NO (2)) pz)(2)] Ag [P (C (6) H (5))(3)](2) and [H (2) B (3-(NO (2)) pz)(2)] Ag [P (p-C (6) H (4) CH (3))(3)] have pseudo tetrahedral and trigonal planar silver sites, respectively. The bis (pyrazolyl) borate ligand acts as a kappa (2)-N (2) donor. The nitro-substituents are coplanar with the pyrazolyl rings in all these adducts indicating efficient electron delocalization between the two units. The [H (2) B (3-(CF (3)) pz)(2)] Ag [P (C (6) H (5))(3)] complex has been obtained from re-crystallization of {[H (2) B (3-(CF (3)) pz)(2)] Ag [P (C (6) H (5))(3)](2)} in a dichloromethane-diethyl ether solution; it is a three-coordinate, trigonal planar silver complex. |
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