A new subgroup of bis(pyrazolyl)methane ligands has been developed through the synthesis of the first N,N,N,Ntetradentate bis(pyrazolyl)methane compounds, namely, bis-(pyrazolyl)bipyridinylmethane [HC(Pz) 2 Bipy, L1] and bis(3,5methylpyrazolyl)bipyridinylmethane [HC(3,5-MePz) 2 Bipy, L2].From these ligands, a large variety of new mononuclear Fe II and Zn II complexes with counterions ranging from halides to carboxylates and sulfate were synthesised and characterised by [a]
The ligand class of tridentate bis(pyrazolyl)methanes was extended via the syntheses of HC(3,5‐EtPz)2Py. This ligand is the first of its kind with a homogeneous 3,5‐functionalization with large substituents. On the basis of 3,5‐functionalized ligands we were able to synthesize 15 novel complexes with FeII, ZnII, and CuII salts. Herein we present an extensive coordination chemistry study, that focuses on the influences of different metals, ligands, and counterions on the coordination mode and on the spin state in case of FeII complexes.
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