Nickel and Palladium Complexes of a PP(O)P Pincer Ligand Based upon a peri -Substituted Acenaphthyl Scaffold and a Secondary Phosphine Oxide

A PP(O)P pincer ligand based upon a peri-
substituted acenaphthyl (Ace) scaffold and a secondary phosphine
oxide, (5-Ph 2P-Ace-6-) 2P(O)H, was prepared and fully charac-
terized including a neutron diffraction study. The reaction with
[Ni(H2 O)6]Cl2 and PdCl2 produced ionic metal(II) complexes
[κ3
-P,P’,P’’((5-Ph 2P-Ace-6-) 2P(OH))MCl]Cl, which upon addi-
tion of Et3 N gave rise to zwitterionic metal(II) complexes κ3
-
P,P’,P’’((5-Ph 2 P-Ace-6-)2P(O))MCl (M = Ni, Pd). The reaction
with Ni(COD) 2 (COD = cyclooctadiene) provided the η3 -
cyclooctenyl Ni(II) complex κ3
-P,P’,P’’((5-Ph 2P-Ace-6-) 2P(O))Ni-
(η3
-C8H 13 ). A detailed complementary bonding analysis of the
P−H, P−O, and P−M interactions was carried out (M = Ni, Pd).