85762-10-3Relevant academic research and scientific papers
Probing substituent effects in phosphinoamine ligands using Mo(CO)5L complexes
Lee, Kyle H.,Napoline,Bezpalko, Mark W.,Foxman, Bruce M.,Thomas, Christine M.
, p. 354 - 360 (2015)
Recent work has revealed substantial differences in the structure, spectroscopic properties, and reactivity of heterobimetallic Zr/Co complexes of the general form XZr(R′NPR2)3CoY (R′ = iPr, 2,4,6-trimethylphenyl, 3,5-dimethylphenyl; R = Ph, iPr; X, Y = halides or neutral donor ligands) as a function of nitrogen and phosphorus donor atom substituents. To probe the electronic differences between these ligands, a series of Mo(CO)5(R2PNHR′) complexes has been synthesized (R = Ph, R′ = iPr (2a); R = iPr, R′ = iPr (2b), 2,4,6-trimethylphenyl (2c), 3,5-dimethylphenyl (2d), 4-methylphenyl (2e), 4-trifluoromethylphenyl (2f), 4-methoxyphenyl (2g)). Thermolysis of Mo(CO)6 with the corresponding phosphinoamine ligands 1a-1g affords 2a-2g. The infrared carbonyl stretching frequencies of these complexes have been compared to probe the effects of phosphorus and nitrogen substituents on the electronic properties of the phosphinoamine ligands.
Synthesis and a multinuclear NMR spectroscopic study of some Mo(CO)5(PPh2XR) (X = O, NH; R = 1-4 carbon alkyls) complexes. Steric effects on 31P and 95Mo chemical shifts
Gray, Gary M.,Gray, Rita June
, p. 1026 - 1031 (2008/10/08)
The syntheses and multinuclear NMR spectroscopic data for a series of Mo(CO)5(PPh2XR) (X = O, NH; R = 1-4 carbon alkyls) complexes is presented. The steric effect of substitution at the α carbon of the R groups is shown to have an effect on the chemical shifts of the aromatic C(1) 13C 31P, and 95Mo resonances but not upon the chemical shifts of the carbonyl 13C and 17O resonances. In addition, the good correlation observed between the chemical shifts of the 95Mo and aromatic C(1) 13C resonances indicates that in the Mo(CO)5(PPh2XR) complexes, the 95Mo and aromatic C(1) 13C resonances are similarly affected by changes in the R group.
