The microwave spectrum of PF2NH2 is consistent with a molecule containing a planar nitrogen configuration with the hydrogen atoms in the symmetry plane. The structural parameters are: tf(PF) = 1.587 ± 0.004 Á,(1) This work was supported in part by grants from the National Science Foundation.(2) (a) K.
It has been demonstrated that the ligand dimethylaminodifluorophosphine, (CH3)2NPF2, will form coordination compounds with metal carbonyls such as Ni(CO)4 and Mo(CO)6 by displacement of carbon monoxide.1 It has also been reported that the ligand will form complexes with CuCl.2 In these complexes phosphorus rather than nitrogen appears to act as the bonding site. No complexes containing paramagnetic ions and (CH3)2NPF2 have been reported. In this study the interactions of cobalt(II) halides with (CH3)2NPF2 have been investigated. Data which will be presented suggest that the complex formed between CoX2 (X = Br, I) and (CH3)2NPF2 is five-coordinate and it is of low spin, both in solution and as a solid. Solid CoCl2 displayed such slight solubility in liquid (CH3)2NPF2 that no attempt was made to study the chloride complex. No evidence for the interaction of solid CoF2 with liquid (CH3)2NPF2 was obtained.Experimental Section Because the compounds employed in^the reactions are sensitive to traces of moisture or oxygen, the reactions were carried out using standard high-vacuum techniques. Solid materials were handled in an atmosphere of dry nitrogen using a drybox.Dimethylaminodifluorophosphine was prepared from dimethylaminodichlorophosphine.3 The identity of the ligand was established by comparison of its infrared spectrum with a previously reported spectrum1 and by a vapor pressure of 93.7 mm at 0°(lit,1 pressure93.4 mm).Anhydrous cobalt(II) fluoride, chloride, and iodide were used as obtained from Alfa Inorganics (Beverly, Mass.
The mixture was then boiled at reflux for 1 day and filtered to remove triethylamine (2.5 g, 0.018 mol).Acknowledgment.-We thank the National Heart and Lung Institute of the Public Health Service for the support of this work through Grant Number 3 ROI HE 11418. We also thank Dr. W. D. Taylor for the ultracentrifuge data.
Rotational transitions in the microwave spectrum of the ground and three excited vibrational states of NF2CN and in the ground states of 1ENF2CN, NF213CN, and NF2C15N have been assigned. By analysis of the moments of inertia, bond distances and bond angles have been derived as follows: d(CN) = 1.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.