Silver(I) bis(l,2,4-triazolyl)borate complexes containing bidentate phosphine ligands

New silver(I) derivatives containing bidentate phosphine and anionic bis(triazol-l-yl)borate ligands have been prepared from the reaction of AgNO3 and dppm (bis(diphenylphosphino)methane), dppe (1,2-bis(diphenylphosphino)ethane), or dppf (1,1'-bis(diphenylphosphino)ferrocene) and potassium dihydrobis(1,2,4-triazolyl)borate, K[H2B(tz)(2)]; their solid state and solufion properties have been investigated through analytical and spectroscopic measurements (IR, H-1 and P-31 NMR). M the compounds are soluble in chlorinated solvents and are non-electrolytes in CH2Cl2 and acetone solutions. [{H2B(tz)(2)}Ag(dppf)] is simple mononuclear array, the silver atom lying in four-coordinate N2AgP2 environment. In [{H2B(tz)(2)}(2)Ag-3(dppm)(2)(NO3)], the silver environment is still four-coordinate but PAgN3, utilizing the coordinating capability of one of the additional ('exo'-) ring nitrogens not only to complete the four-coordinate array about the silver but, necessarily, to link successive asymmetric units into a single-stranded polymer. [{H2B(tz)(2)}(2)Ag-3(dPPM)(2)(NO3)] may be regarded as a hemi-adduct of [{H2B3(tz)(2)}Ag(dppm)] with silver(I) nitrate, thus [{H2B(tz)(2)}Ag(dppm)]: AgNO3 (2:1). (C) 2004 Elsevier Ltd. All rights reserved.