Lecture 8_Molecular Shape and Properties_Feb. 13.pdf

Lecture 8_Molecular Shape and Properties_Feb. 13.pdf - 3a...

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F S F 3a) In compounds based on C.N. = 5 (trigonal bipyramidal) lone pairs preferentially occupy equatorial positions. SF 4 , sulphur tetrafluoride I 3 - , triiodide I I I F F distorted tetrahedral linear shorter (1.315 Å) longer (1.645 Å) < 120 ° (101.1 ° ) < 90 ° (86.6 ° )
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Other geometries that mimimize LP/LP repulsions: BrF 5 , bromine pentafluorine square pyramidal IF 4 - , tetrachloroiodate square planar Br F F 85 ° F F F I Cl Cl Cl Cl 90 °
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121.2 ° H C C 4) Multiple bonds are effectively larger than single bonds. COF 2 , carbonyl fluoride CH 2 CH 2 , ethylene O C 108 ° F F 126 ° H H H 117.6 °
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5) Bonding pairs to more electronegative atoms are effectively smaller than bonding pairs to less electronegative atoms. H N H H H C H H H H O H 106.8 ° 104.5 ° 109.5 ° F N F F F C H F F F O F 102.1 ° 103.8 ° 108.6 ° As bond pairs move closer to the central atom (and to each other) they repel one another more.
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