“…The length of the C(4a)-N(lb) bond between the two pyridine rings is 1.447 (11) Á which is not significantly different from the values of 1.4 5 9 ( 5)28 and 1.471 (12) Á29 reported for other /V-phenylpyridinium ions. The remaining distances and angles in the ligand are all within the generally accepted values.…”
“…The length of the C(4a)-N(lb) bond between the two pyridine rings is 1.447 (11) Á which is not significantly different from the values of 1.4 5 9 ( 5)28 and 1.471 (12) Á29 reported for other /V-phenylpyridinium ions. The remaining distances and angles in the ligand are all within the generally accepted values.…”
“…Cationic ligands using a quaternary ammonium or phosphonium ion as the source of the positive charge have failed to demonstrate either an extensive interaction of the positive charge with the complexed metal or a significant change in the reactivity of a cationic ligand over a neutral analogue. 20 Registry No. Co(fdpp)Cl2, 67292-36-8; Co(fdpp)Br2, 67292-37-9; Co(fdpp)I2, 67292-35-7; Ni(fdpp)Cl2, 67292-34-6; Ni(fdpp)Br2, Inorganic Chemistry, Vol.…”
Hydride Complexes of Ru with Carborane Ligands Co(III), Cu(I) formulation would expect a yellow, diamagnetic product similar to the Cu(fdpp)I material.The UV-visible spectra, Table IV, demonstrate the electronic changes that have occurred in the (cdpp)+ fragment of the Cu(cdpp)Cl2. In the spectrum of Cu(cdpp)Cl2 there are no UV-visible absorptions which can clearly be attributed to the ligand [cdpp]+. In contrast the high-energy portion of the UV-visible spectrum for [Co(cdpp)Cl2]Cl matches the UV-visible spectrum of [cdpp]PF6 exactly.A more acceptable valence assignment is Con/Cun. This assignment accounts for the changes in the ligand part of the UV-visible spectrum and the paramagnetism of the compound.Since this material would have two paramagnetic centers, it could display magnetic concentration effects such as fielddependent paramagnetism. Nevertheless, magnetic concentration effects are complex, and more extensive study is needed before any realistic assignment can be made for this material.
Conclusion1,1 ,-Bis(diphenylphosphino)cobaltocenium hexafluoro-
“…The required ligand 1-(dimethylamino)-2-(diphenylphosphino)ethane, 1 , was much better prepared by reaction of the potassium salt of diphenylphosphine with 2-chloro- N,N -dimethylethylamine (Scheme 1). …”
Section: Resultsmentioning
confidence: 99%
“…The organic layer was washed with distilled water (2 × 150 mL), dried, and evaporated to give a dense oil (0.299 g, 56%) characterized as 1 practically pure. A sample distilled at 175−180 °C/0.4 mmHg (lit . bp 146−149 °C/0.08 mmHg): 1 H NMR (250MHz, CDCl 3 ) δ 2.11−2.22 (m, 8H), 2.28−2.37 (m, 2H), 7.23−7.49 (m, 10H).…”
13C NMR differences of chemical shifts (delta(X) - delta(H)) of allyl carbon atoms in a series of trans-(1-(diphenylphosphino)-2-(dimethylamino)ethane)(eta(3)-1-arylallyl)palladium tetrafluoroborates, X ranging from NO(2) to OMe, correlate very well with sigma Hammett constants for C-1 and with sigma(+) for C-3, this carbon atom being in a trans relationship with the positively charged nitrogen atom.
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