Transition Metal Complexes with Thiosemicarbazide-Based Ligands. 33. [4-(2-Diphenylphosphino-α-ethoxybenzyl-P)-3-methyl-1-salicylideneisothiosemicarbazido-N¹,N⁴,O]nickel(II)

The title compound, [Ni(C₃₀H₂₈N₃O₂PS)], is the first example of a transition metal complex involving a thiosemicarbazide-based tetradentate ligand with a P atom in its coordination sphere. The Ni atom in the complex has a distorted square-planar configuration formed by N₂OP donor atoms. It can be concluded from the structure that the formation of the complex involved addition across the azomethine group, which is the first time this has been observed for this class of ligands.

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