Isotropic Proton Magnetic Resonance Shifts in π-Bonding Ligands Coordinated to Paramagnetic Nickel(II) and Cobalt(II) Acetylacetonates

2-Pyridyl-phosphine and -diphosphine complexes of nickel(0), their reactivity (including aqueous solution chemistry), and some related, incidental methylphosphonium iodides

“…Nickel(0) species are typically unreactive toward Cl 2 [43], although both Ni(CO) 2 [8]. The wellresolved 1 H spectra result from the favorable electron relaxation time of paramagnetic octahedral Ni II complexes [43,49]. The formulations of 9a-c were confirmed by elemental analysis.…”

An investigation of the 1H nmr isotropic shifts for some methyl-substituted bipyridine complexes with Ni(II) and Co(II)

“…However, a n-spin transfer mechanism was reported to predominate in the 'H nmr isotropic shifts of some octahedral Schiff base Ni(I1) complexes (26)(27)(28)(29). The charge transfer from metal to ligand via a n-mechanism in the divalent tris(2,2'-bipyridine) metal complexes of the first transition metals was also confirmed by Torii and co-workers (30), by Felix et al (31), and by Nakamoto and co-workers (32).…”

Application of Paramagnetic Shift Reagents in Nuclear Magnetic Resonance Studies of Complex Alcohols and Amines

“…A number of reports have been published on the 'H n.m.r. spectra of the complexes Co(acac),L, and Ni(acac),L, where L is pyridine (13), piperidine (13), a-, P-, and y-picolines (13), aryl phosphines, arsines, amines, sulfides, halides, and isonitriles (14), substituted anilines (15), substituted pyridine N-oxides (16,17) and quinoline N-oxides (18). No contact shifts were observed with bromobenzene, tris-otolylphosphine, triphenylarsine, triphenylamine, benzonitrile, and diphenyl sulfide (13).…”