Abstract
The crystal structures of the well-known complexes, [(Me4en)M(II)X2] (Me4en = N,N,N′,N′-tetramethylethylenediamine; M(II) = Pd(II) or Pt(II); X− = NO2− or NO3−) have been determined. For [(Me4en)Pd(NO2)2] and [(Me4en)Pt(NO2)2], the nitrite anion acts as a monodentate N-donor ligand in the solid state. In contrast, for [(Me4en)Pd(ONO2)(O2NO)], the two nitrate anions act as a monodentate O-donor (ONO2) and a bidentate O,O′-donor (O2NO). Recrystallization of [(Me4en)Pt(NO3)2] from Me2SO yields the Me2SO adduct with a monodentate O-donor nitrate and a counteranionic nitrate, [(Me4en)Pt(ONO2)(S-Me2SO)](NO3). The solution behavior of these complexes, including the equilibrium between coordinated and free Me2SO, has been investigated.
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