Synthesis, NMR and single crystal X-ray structural studies on planar NiS4 and NiS2PN chromophores: Steric and electronic effects

► Synthesis of two nickel complexes. ► Characterization by IR, electronic and NMR spectra. ► Crystal structures of the two compounds. ► Steric and electronic effects of the substituents. ► Systematic analysis of distortions in the geometry of the complexes.