Abstract
The triphosphines RP[CH 2CH 2P(OCH 3) 2] 2 (R = CH 3 and C 6H 5) react with the metal(II) chlorides of iron, cobalt, and nickel in methanol solution to form the corresponding [(triphos)MCl] + cations isolated as the chloride and hexafluorophosphate salts. Magnetic susceptibility data indicate that the yellow diamagnetic nickel complexes are square planar but the blue to green cobalt and brown iron complexes are tetrahedral. Nickel(II) chloride reacts with the diphosphine (C 6H 5) 2PCH 2CH 2P(OCH 3) 2 to give a diamagnetic apparently square planar nickel(II) complex of the stoichiometry (diphos) 2NiCl 2 in which each diphosphine unit functions as a monodentate ligand. However, cobalt(II) and iron(II) chlorides react with (C 6H 5) 2PCH 2CH 2P(OCH 3) 2 to give products of stoichiometry (diphos)MCl 2 formulated as the dimeric ionic derivatives [(diphos) 2M 2Cl 2]Cl 2 on the basis of magnetic measurements, conductivities, and metathesis with NH 4PF 6.
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