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Molecular shapes with multiple bonds

Molecules with multiple bonds between metal atoms often have structures with beautiful and highly symmetrical polyhedral shapes [3-52], The square prismatic [Re2Clg] ion [3-53], shown in Figure 3-36, played an important role in the history of the discovery of metal-metal multiple bonds. Figure 3-37a shows another molecular model with a metal-metal multiple bond. Its shape is similar to the paddles that propel riverboats. There is then a whole class of hydrocarbons called paddlanes [3-56], and one of their representatives is shown in Figure 3-37b. [Pg.133]

The shape of a molecular particle plays a major role in determining the macroscopic properties of a substance. We examine this role in other chapters in this book. To better understand and predict the shape-property relationship, you should know what is responsible for molecular shape, and this is discussed in this section and the next. Discussion in these sections is limited to molecules having only single bonds. Molecules with multiple bonds are considered in Section 13.4. [Pg.368]

Because n bonds always are oriented parallel to the cr bonds with which they are associated, it follows that the molecular shape will be determined solely by the number of cr bonds that the central atom has. It is understandable, therefore, why predictive rule 2(b) on p 119 states that only two electrons of a multiple bond can be used to calculate the number of electron pairs around the central atom. [Pg.138]


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