Tetrahedral geometry, conventions

Testosterone, conformation of, 129 molecular model of, 129 structure and function of, 1082 Tetracaine, structure of, 967 Tetrahedral geometry, conventions for drawing. 8... 

Convert the following representation of ethane, C2H6/ into a conventional drawing that uses solid, wedged, and dashed lines to indicate tetrahedral geometry around each carbon (gray = C, ivory = H). 

These systems are also described as normal copper proteins due to their conventional ESR features. In the oxidized state, their color is light blue (almost undetectable) due to weak d-d transitions of the single Cu ion. The coordination sphere around Cu, which has either square planar or distorted tetrahedral geometry, contains four ligands with N and/or 0 donor atoms [ 12, 22]. Representative examples of proteins with this active site structure (see Fig. 1) and their respective catalytic function include galactose oxidase (1) (oxidation of primary alcohols) [23,24], phenylalanine hydroxylase (hydroxy-lation of aromatic substrates) [25,26], dopamine- 6-hydroxylase (C-Hbond activation of benzylic substrates) [27] and CuZn superoxide dismutase (disproportionation of 02 superoxide anion) [28,29]. 

Nickel. The synthesis of unusual metal complexes by our new synthetic method is shown by the formation of the square-planar cation in [Ph3PI][Ni(PPh3)l3], whereas, according to conventional wisdom, large ligands such as PPh3 and iodide should force tetrahedral geometry around nickel(ii). 

Figure 4 Crystal field splitting patterns for the common coordination geometries tetrahedral and square planar. For the square-planar arrangement, the z-axis is conventionally taken to be perpendicular to the square plane...

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