Unsymmetrical 3- and 5-substituted bis(pyrazolyl)borate system

An unsymmetrical 3- and 5-substituted bis(azolyl)borate system, the sodium dihydrobis(3-trifluoromethyl-pyrazol-1-yl)(5-trifluoromethyl-pyrazol-1-yl)borate, Na[H2B(3-(CF3)pz)(5-(CF3)pz)], has been synthesized by the reaction of 3-trifuoromethyl-pyrazole with Na[H3B(5-(CF3)pz)] in toluene solution. Na[H2B(3-(CF3)pz)(5-(CF3)pz)] reacts with AgNO3 in the presence of triphenylphosphine to afford the silver(I) bis(phosphane) adduct {[H2B(3-(CF3)pz)(5-(CF3)pz)]Ag[P(C6H5)3]2}. These compounds have been characterized by elemental analyses, FT-IR, ESI-MS and multinuclear NMR spectroscopy. Solid state structure of {[H2B(3-(CF3)pz)(5-(CF3)pz)]Ag[P(C6H5)3]2} is also reported. It features a κ2-N,N′ bonded bis(pyrazolyl)borate ligand and a pseudo-tetrahedral silver center.