The Nitrosyl Halogenides

The Nitrosyl Halogenides.—Nitrosyl fluoride, chloride, and bromide, ONF, ONC1, and ONBr, have been studied by the electron-diffraction method1 and by microwave spectroscopy.1 Their configuration is nonlinear. The N—O distance is 1.14 0.02 A. Although a reasonable electronic structure, I, 

The contribution of structure III would be expected to amount to a few percent for BrNO and C1NO, and much more for FNO, because of the greater stability of the fluorine-nitrogen double covalent bond. A resonating structure with 50 percent contribution of II, 25 percent of I, and 25 percent of III is compatible with both the observed F—N distance in FNO and the observed value18 1.81 D of the electric dipole moment. 

Nitrosyl-Metal Complexes. —Reasonable structures of metal-nitrosyl. .. +  

The brown-ring test for nitrates involves the formation of a dark-brown unstable complex of nitric oxide and hydrated ferrous ion. The composition of the complex19 is probably [Fe(OH2)8NO] f+. Let us 

In this structure all nine outer orbitals of the iron atom are used in 

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