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Square-based bipyramid complex

Although the majority of complexes have structures that are linear, tetrahedral, square planar, or octahedral, a few compounds have a trigonal bipyramid structure. Most notable of these are Fe(CO)5, Ni(CN)5ji, and [Co(CN)5]3T Some complexes having a coordination number of 5 have the square-base pyramid structure, including [Ni(CN)5 3. Although it is not particularly common, the coordination number 8 is found in the complex [Mn(CN)8]4-, which has a cubic structure with CIST ions on the corners. [Pg.580]

Both Co2+ and Ni2+ also have the ability to make use of 4s, 4p, and 4d orbitals in another way by forming sp2d2 hybrids in the formation of complexes having a square-based pyramid structure. In fact, trigonal bipyramid and square-based pyramid structures are both observed for [Ni(CN)5J3. ... [Pg.596]

Let us first consider the case of a substitution reaction in a complex of a d6 ion such as Co3+ in a strong field. If the process takes place by an SN1 process, the five-bonded transition state may be presumed to have either a trigonal bipyramid or square-based pyramid structure. The orbital energies will be determined as follows ... [Pg.708]

Starting Oh complex Trigonal bipyramid Square-based planar... [Pg.709]

In general, it is not possible to predict the stereochemistry about the separate copper(II) ions in most cases they are the same and may or may not be related by a centre of symmetry. The actual stereochemistries produced are recognizably the same as those occurring in mononuclear copper(II) complexes (Figure 19.1). The most common is that of square-based pyramidal with rhombic coplanar, compressed tetrahedral, trigonal bipyramidal and elongated rhombic octahedral stereochemistries all occurring. [Pg.619]

E7.5 With five-coordinate complexes, the two possible geometries are trigonal bipyramidal and square-based... [Pg.92]

The amended VSEPR model predicts two forms of five-coordination, and experimental chemistry has clearly identified many examples of both forms. These limiting structures are square-based pyramidal (or, simply, square pyramidal) and trigonal bipyramidal (Figure 4.13). The classical square-based pyramidal shape is formed simply by cleaving off one bond from an octahedral shape, which leaves the metal in the same plane as the four square-based ligands. In reality, almost no complexes exhibit this shape, but rather adopt a distorted... [Pg.93]

The limiting structures for 5-coordination are the trigonal bipyramid and square-based pyramid. In practice, many structures lie between these two extremes, and we have already emphasized that the energy differences between trigonal bipyramidal and square-based pyramidal structures are often small (see Section 2.11). Among simple 5-coordi-nate complexes are trigonal bipyramidal [CdCls], ... [Pg.544]

For some Ni(II) complexes, there is only a small energy difference between structure types. In Section 19.7, we stated that both trigonal bipyramidal and square-based pyramidal [Ni(CN)5] ions (equation 21.90) are present in crystals of [Cr(en)3][Ni(CN)5]1.5H20. In the anhydrous salt, however, the anions are square-based pyramidal. It is impossible to give a simple interpretation of these observations which may be attributed to a subtle balance of steric and electronic effects . [Pg.632]


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See also in sourсe #XX -- [ Pg.578 , Pg.580 , Pg.586 , Pg.596 ]




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