Abstract
The synthesis of the high-spin nickel(II) complexes L2NiX2 is described, where L is the bidentate selenium ligand 1,2-bis(isopropylseleno)ethane and X is Cl or Br. These pale-green complexes are considered to have a six-co-ordinate molecular structure on the basis of conductimetric, magnetic, and spectroscopic evidence. They react with the stoicheiometric amount of potassium thiocyanate to give a bright green, paramagnetic, square-planar isothiocyanato-complex LNi(SCN)2; this, when heated in isopropyl alcohol under reflux affords a yellow complex LNi2(SCN)4 which is probably polymeric. With an excess of potassium thiocyanate the chloro-complex yields the pale blue compound K4Ni(SCN)6,2EtOH.
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