Facile synthesis and structures of silver formamidinates and pyrazolates

Dinuclear silver formamidinates, [Ag-2(DFForm)(2)(py)(2)] (1) (DFForm, N,N'-bis(2,6-difluorophenyl) formamidinate, py = pyridine), [Ag-2(mHForm)(2)(py)(3)] (2) and [Ag-2(mHForm)(2)(CH3CN)(2)] (2a) (mHForm, N,N'-bis(2,3,4,6-tetrafluorophenyl)formamidinate), [Ag-2(pHForm)(2)(py)(3)] (3) (pHForm, N,N'-bis(2,3,5,6-tetrafluorophenyl)formamidinate), [Ag-2(PFForm)(2)(py)(3)] (4) (PFForm, N,N'-bis (2,3,4,5,6-pentafluorophenyl)formamidinate) and [Ag-2(DippForm)(2)]center dot 1.25CH(2)Cl(2) (5) (DippForm, N,N'-bis(2,6-diisopropylphenyl)formamidinate), and polynuclear, mainly trinuclear, silver pyrazolates, [Ag-3(Ph(2)pz)(3)] 2 (6) (Ph(2)pz, 3,5-diphenylpyrazolate), [Ag(tBu(2)pz)] 4 (7) (tBu(2)pz, 3,5-di-tertbutylpyrazolate), [Ag-3(PhMepz)(3)] (8) (PhMepz, 3-methyl-5-phenylpyrazolate), [Ag-3(Phtpz)(3)] (9) (Phtpz, 3-phenyl-5-(2-thienyl)pyrazolate), [Ag-3(ttfpz)(3)] (10) (ttfpz, 3-(2-thienyl)-5-trifluoromethylpyrazolate) and [Ag-2(Me(2)pz)(PPh3)(4)Cl] (11) (Me(2)pz, 3,5-dimethylpyrazolate) were successfully synthesized in good yield by treating silver(I) oxide with the corresponding formamidines (FormH) or pyrazoles (pzH) either in pyridine or acetonitrile. These rapid, easily handled and economical reactions are readily monitored by consumption of black silver oxide. All compounds are potential precursors in redox transmetallation reactions in the synthesis of lanthanoid and alkaline earth pyrazolate and formamidinate complexes.

Automated summary

This study investigates the synthesis methods of different types of silver formamidinate and silver pyrazolate compounds. These synthesis methods are simple, easy to handle, and have high yields, making them potential precursor compounds for synthesizing lanthanoid and alkaline earth pyrazolate and formamidinate complexes.