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Starting from easily accessible 3‐[2‐(diphenylphosphanyl)phenyl]‐1H‐pyrazole a series of four‐ and five‐coordinate diamagnetic nickel(II) complexes were synthesized and structurally characterized. The resulting complexes show dynamic NMR spectra reflecting a high degree of flexibility in the ligand backbone. Protonation and deprotonation of the pyrazole moiety allows interconversion of the nickel(II)...
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