Abstract
A series of new mono-, bi-, and tri-nuclear Ni(II) compounds have been synthesized. All of the compounds contain bidentate diphenylphosphinoethane (dppe) ligand and different thiolates with (HOC(O)CH2CH2S−, HOC(O)-p-C6H4-S−, NC5H4-p-S−) or without (MeS−, EtS−) additional functional groups. Molecular structure determinations reveal interesting structural diversity in the Ni(II)-thiolate compounds while the redox properties clearly manifest the effect of the mixed strong field-weak field ligand environment around Ni(II). Cyclic voltammetric study of the compounds further indicates that oxidation can induce the conversion of mononuclear to binuclear Ni(II) compounds, which was confirmed by chemical oxidation and isolation of the products. All of the compounds have been characterized by a combination of single crystal X-ray structure determination, elemental analysis, 1H, 13C, 31P NMR spectroscopy, mass spectrometry and absorption spectroscopy.
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