15169-64-9Relevant articles and documents
Porri, L.,Gallazzi, M. C.,Vitulli, G.
, (1967)
Field-Induced Slow Magnetic Relaxation in the Ni(I) Complexes [NiCl(PPh3)2]·C4H8O and [Ni(N(SiMe3)2)(PPh3)2]
Lin, Weiquan,Bodenstein, Tilmann,Mereacre, Valeriu,Fink, Karin,Eichh?fer, Andreas
, p. 2091 - 2100 (2016/03/19)
Direct current (dc) and alternating current (ac) magnetic measurements have been performed on the three Ni(I) complexes: [NiCl(PPh3)3], [NiCl(PPh3)2]·C4H8O, and [Ni(N(SiMe3)
Tandem redox mediator/Ni(II) trihalide complex photocycle for hydrogen evolution from HCl
Hwang, Seung Jun,Powers, David C.,Maher, Andrew G.,Nocera, Daniel G.
, p. 917 - 922 (2015/02/05)
Photoactivation of M-X bonds is a challenge for photochemical HX splitting, particularly with first-row transition metal complexes because of short intrinsic excited state lifetimes. Herein, we report a tandem H2 photocycle based on combination of a non-basic photoredox phosphine mediator and nickel metal catalyst. Synthetic studies and time-resolved photochemical studies have revealed that phosphines serve as photochemical H-atom donors to Ni(II) trihalide complexes to deliver a Ni(I) centre. The H2 evolution catalytic cycle is closed by sequential disproportionation of Ni(I) to afford Ni(0) and Ni(II) and protolytic H2 evolution from the Ni(0) intermediate. The results of these investigations suggest that H2 photogeneration proceeds by two sequential catalytic cycles: a photoredox cycle catalyzed by phosphines and an H2-evolution cycle catalyzed by Ni complexes to circumvent challenges of photochemistry with first-row transition metal complexes.
Indenyl-nickel complexes bearing a pendant, hemilabile olefin ligand: Preparation, characterization, and catalytic activities
Gareau, Daniel,Sui-Seng, Christine,Groux, Laurent F.,Brisse, Francois,Zargarian, Davit
, p. 4003 - 4013 (2008/10/09)
The reaction of (PPh3)2NiCl2 with Li[Ind∧CH=CH2] gave the neutral complexes (η: η0-Ind∧CH=CH2)Ni(PPh3)Cl (Ind = indenyl; ∧ = (CH2)2, 1a; Si(Me)2CH 2, 1b), which were subjected to Cl- abstraction to give the corresponding cationic complexes [(η:η2-Ind∧CH= CH2)Ni(PPh3)]+ (∧ = (CH2) 2, 2a; Si(Me)2CH2, 2b). The bis(phosphine) derivatives [(η:η0-Ind-CH2CH2CH=CH 2)Ni(PPh3)2]+ (3a) and [(η3-allyl)Ni(PPh3)2]+ (4) formed gradually from room-temperature solutions of 2a and 2b, respectively, even in the absence of added PPh3. On the other hand, [(η:η0-Ind-SiMe2CH2CH=CH 2)Ni(PPh3)2]+ (3b) was detected only when PPh3 was added to a CD2Cl2 solution of 2b. The lability of the vinyl moiety in 2 allows these complexes to act as single-component precatalysts for the polymerization and hydrosilylation of styrene; the latter reaction requires little or no induction period with the hydrosilanes PhRSiH2 (R= Ph, Me, H) and proceeds with up to 1000 catalytic turnovers. Compounds 1a, 1b, 2a, 3a, and 4 have been characterized by NMR and single-crystal X-ray diffraction studies, whereas 2b and 3b were identified by NMR spectroscopy. Structural information gleaned from both solid-state and solution data provide important information on the Niolefin bonding in 2a and 2b and indicate that the Ni-Ind interactions in these complexes are affected by the significant trans influence of the chelating olefin moiety.
