EXAMPLE 3.4SbF,- has a single lone pair on Sb. Its structure is therefore similar to SF,, with a lonepair occupying an equatorial position. This lone pair causes considerable distortion,giving an F-Sb-F (axial positions) angle of 155° and an F– Sb-F (equatorial)angle of 90°.SF;- has a single lone pair. Its structure is based on an octahedron, with the iondistorted away from the lone pair, as in IF .SeF,* has a single lone pair. This lone pair reduces the Se-F bond anglesignificantly, to 94º.EXERCISE 3.2 Predict the structures of the following ions. Include a description ofdistortions from the ideal angles (for example, less than 109.5° because...).NH, NH, I; PCl-

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EXERCISE 3.2 Predict the structures of the following ions. Include a description of distortions from the ideal angles (for example, less than 109.5° because...). NH, NH, 1, PCL-

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Chapter1: Chemical Foundations

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Question

EXAMPLE 3.4
SbF,- has a single lone pair on Sb. Its structure is therefore similar to SF,, with a lone
pair occupying an equatorial position. This lone pair causes considerable distortion,
giving an F-Sb-F (axial positions) angle of 155° and an F– Sb-F (equatorial)
angle of 90°.
SF;- has a single lone pair. Its structure is based on an octahedron, with the ion
distorted away from the lone pair, as in IF .
SeF,* has a single lone pair. This lone pair reduces the Se-F bond angle
significantly, to 94º.
EXERCISE 3.2 Predict the structures of the following ions. Include a description of
distortions from the ideal angles (for example, less than 109.5° because...).
NH, NH, I; PCl-

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