Abstract

The substituted tritertiary arsine, 2-chloroethyl-bis(3-dimethylarsinopropyl)arsine, forms Ni(trias)X 2 (X = Cl, Br, I), which are assigned tetragonal pyramidal pentacoordinate structures. The Pd(trias)Cl 2 species is best assigned as a planar [Pd(trias)Cl]Cl coordination moiety. Both [Co(trias)Br] 2[CoBr 4] and [Co(trias)Br]ClO 4 contain pseudotetrahedral cations, but [Co(trias) 2](ClO 4) 2 is unlike any four-coordinate or six-coordinate cobalt(II) entity and is assigned a pentacoordinate structure containing a tridentate and a bidentate ligand. The donor properties of trias are compared to that of similar tridentate ligands.

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