Intermolecular Interactions

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Unformatted text preview: bond strength is ~464kJ/mol •  The HO ­H ­ ­ ­O ­H2 H ­bond strength is ~20kJ/ mol •  F ­H ­ ­ ­F ­ is ~150kJ/mol –  HF2 ­ is some+mes thought of as polyatomic anion H ­bonding III Bond Strength (kJ/mol) H3N ­ ­ ­H ­NH2 ~ ­12 H2O ­ ­ ­H ­OH ~ ­20 HF ­ ­ ­FH ~ ­70 HF ­ ­ ­F ­ ~ ­150 H .. .. .. H H NH H H H O .. .. H .. H .. H .. HH O .. .. N H H N..H H Keep in mind: X-H-X is linear In the gas phase. Not always in liquids. but H-X-H is a H TETRAHEDRAL bond angle. O .. NH H H H .. N H H H .. F .. .. .. .. F .. O H Water: crazy fun +mes •  H ­bond/covalent bond ra+o (~1.7/2 at RT) •  Time to reorder (2ps) •  Each h ­bond make more likely –  Coopera+vity •  Transient structure forma+on Ice ~Hexagons The inability of the H ­O ­H angle to be ~109.5o is called proton frustra<on. NOT Flat "Chair Conformation" Ice IH. There are other ice phases. From La+n: clathratus (laiced, like prison bars) Might be most Common water Phase in universe Clathrate Structures Cages, and fragments, transiently form in liquid water PROTON FRUSTRATION AHOY Requires a guest (water is the host). Non ­stoichiometry Alert! Many clathrate hydrates...
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