Arsenic interatomic distance

The radii in the lowest row of the table were obtained by a number of approximate considerations. For instance, if we assume the bismuth radius to bear the same ratio to the interatomic distance in elementary bismuth as in the case of arsenic and antimony, we obtain (Bi) = 1.16— 1.47 A. A similar conclusion is reached from a study of NiSb and NiBi (with the nickel arsenide structure). Although the structures of the aurous halides have not been determined, it may be pointed out that if they are assumed to be tetrahedral (B3 or Bi) the interatomic distances in the chloride, bromide, and iodide calculated from the observed densities1) are 2.52, 2.66, and 2.75 A, to be compared with 2.19, 2.66, and 2.78 A, respectively, from pur table. 

Asl3 and Bils. Heyworth and Braekken4) in their studies of the hexagonal crystals Asls and Bils assigned to them structures in which each arsenic or bismuth atom is surrounded by six equidistant iodine atoms, the interatomic distances reported being As—I = 2.97 A and Bi—I = 3.09 A. As in the case of eulytite, we believe that the trivalent atoms are displaced towards three and away from three of these six atoms, until the smallest interatomic distances become As — 7 = 2.54 A and Bi — I = 2.84 A5). 

Group 13 Metals - Aluminum, Gallium, Indium, Thallium 133 Table 3.7. Interatomic distances in gallium-arsenic supermolecules. 

Table 3.11. Interatomic distances in indium- -arsenic supermolecules.

If radicals are formed in solution, what happens upon vaporization Around this time, studies of the gas-phase structures of the phosphorus and arsenic compounds were initiated in two separate gas electron diffraction (GED) laboratories. It was soon clear that in both cases the compounds were effectively 100% dissociated in the gas phase. However, determination of the molecular structures of the P[CH(SiMe3)2]2 and As[CH(SiMe3)2]2 radicals was a very difficult undertaking as in GED studies resolution of similar interatomic distances is difficult if not impossible. In P[CH(SiMe3)2]2 there are P—C distances and inner and outer Si—C distances, which are aU nearly the same, and there are similar problems with non-bonded distances, P Si, Si Si and C C. In As[CH(SiMe3)2]2 the problems are essentially the same. There are also distortions due to steric crowding, and the molecules have little symmetry (C2 in the gas phase). 

Interatomic distances and distortions in arsenic-type elements... 

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