Mono- and dimeric complexes of an asymmetric heterotopic P,C_NHC,pyr ligand

Abstract

An asymmetric tridentate ligand with three different donors coordinates to Ag(i) and Au(i) to give discreet ligand-bridged dimers or κ1-C species whilst full κ3-binding occurs with Ni(ii), Pt(ii) and Rh(i).

N-Heterocyclic Carbene Complexes of Copper, Nickel, and Cobalt

“…The aryloxy-NHC complexes 313 Ni and 314 Ni were prepared by the reaction of the imidazolium salts with nickelocene; they feature square-planar Ni centers and exhibit moderate to high activity toward the homopolymerization of norbornene and copolymerization of norbornene with 1-octene with B­(C 6 F 5 ) 3 as the cocatalyst . Finally, the chiral nonsymmetric imidazolium proligands with phosphine and pyridine donor wingtips were used for the synthesis of Ni-η 3 -octenyl and Ni-Cl complexes 316 Ni and 317 Ni by methods similar to those described for the symmetrical pyridine-functionalized tridentate ligand described previously (Schemes and ) …”

Asymmetric Cationic Phosphines: Synthesis, Coordination Chemistry, and Reactivity

“…The construction of such ligands requires access to chiral forms of the positively charged organic substituent and the phosphorus-containing component. We − and Wilhelm − have already demonstrated the synthetic utility of amidinium species derived from 1,3-diamino-1,2,2-trimethylcyclopentane which made this the obvious candidate for the cationic fragment. The need for a robust, inherently chiral PR 2 group capable of supporting a stable N–P bond to the amidinium led to the selection of 1,3,5,7-tetramethyl-2,4,6-trioxa-8-phosphatricyclo­[3.3.1.1 , ]­decane or Cagephos (CgP) as it satisfied all of the desired criteria. − Our preliminary report detailed the synthesis of the ligand as a diastereomeric mixture as our original attempts at resolution were unsuccessful .…”

Heterotridentate Organomonophosphines in Pt(η3-P1C1C2)(Y) and Pt(η3-P1C1N1)(Y) Derivatives—Structural Aspects

“…The P 1 C 3 NC 1 NC 3 N 1 type was formed in tetragonal [Pt{η 3 -Ph 2 P(C 23 H 28 N 3 )}(Cl)]PF 6 .thf Figure 2 [20]. The values of chelate L-Pt-L angles are 92.8 • (P 1 -Pt-C 1 ) and 86.1 • (C 1 -Pt-N 1 ).…”