title: Silver(I)-organophosphane complexes of electron withdrawing CF3- or NO2-substituted scorpionate ligands.
abstract: 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.
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032 Camerino (MC), Italy.
authors.forename: Maura
authors.initials: M
authors.lastname: Pellei
authors.forename: Simone
authors.initials: S
authors.lastname: Alidori
authors.forename: Grazia
authors.initials: G
authors.lastname: Papini
authors.forename: Giancarlo Gioia
authors.initials: GG
authors.lastname: Lobbia
authors.forename: John D
authors.initials: JD
authors.lastname: Gorden
authors.forename: H V Rasika
authors.initials: HV
authors.lastname: Dias
authors.forename: Carlo
authors.initials: C
authors.lastname: Santini
mesh_terms: D018360:Crystallography, X-Ray; D004583:Electrons; D005466:Fluorocarbons / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009585:Nitrogen Dioxide / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010720:Phosphines / Q000737:chemistry*; D011720:Pyrazoles / Q000737:chemistry*; D018030:Silver Compounds / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D005466:Fluorocarbons; D008024:Ligands; D009942:Organometallic Compounds; D010720:Phosphines; D011720:Pyrazoles; D018030:Silver Compounds; C044646:phosphine; D009585:Nitrogen Dioxide