By Anatoly Agulyansky
Digital, optical, mechanical and scientific home equipment are only a number of examples of contemporary functions that use tantalum and niobium. In Chemistry of Tantalum and Niobium Fluoride Compounds, the writer attracts on thirty years' adventure to supply the 1st ever monograph to systemize and summarize the information on hand on tantalum and niobium fluoride compounds. This entire reference resource deals a wealthy number of learn method and is useful to researchers studying the chemistry of fluorides, in addition to academics and scholars in chemistry and metallurgy.
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Extra resources for Chemistry of Tantalum and Niobium Fluoride
What is its point group? ExERCISE 2-11 The following species have tetrahedral shapes: S0 2 F 2 , SO/-, Zn(NH 3)/+, CFCI 3 , CF 2 CI 2 • Give the point group of each. ) ExERCISE EXERCISE 2-12 Give the point group of each of the following molecules: (a) MoCI 5 , Mo is at the center of a trigonal bipyramid; (b) Mo 2CI 10, each Mo is surrounded by six Cl atoms at the vertices of an octahedron. One edge, defined by two Cl atoms, is shared by two octahedra. 2-13 Sulfur forms S8 molecules which have D 4 tJ symmetry.
The N 4 S4 molecule (Fig. 2-25) has D2d symmetry. CUBIC POINT GROUPS. The next groups we will consider are the cubic point groups T, Th, Td, 0, and Oh, which, in common with the cube, have four intersecting e 3 axes. The group T has all of the rotational symmetry elements of a regular tetrahedron. Figure 2-26 shows a regular tetrahedron inscribed in a cube. Each of the four body diagonals of the cube corresponds to a e 3 axis. In addition to these threefold axes, the group T has three e 2 axes parallel to the cube edges, bisecting opposite edges of the tetrahedron.
2-15 Liuaitation on couabinations of quauaetry eleuaents An interesting problem that arises is whether or not there exist symmetry groups other than those we have described. For example, is it possible to have a molecule that has two c6 axes, or could we have a c4 axis perpendicular to a C 3 axis? The answer is that there are no finite symmetry groups other than the ones we have discussed. Although there is nothing to stop us from carrying out the mathematical operations of combining perpendicular C4 and C3 axes, we would find that the products of elements continually lead to new elements, and the closure property could not be satisfied without an infinite number of elements.