Weak hydrogen bonds in crystal engineering

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Lucky aga<strong>in</strong> R CO 2 H R CO 2 H H H pK a ~ 38 pK a ~ 44 Gives a chance to probe stereoelectronic effects
Hypotheses Catemer formation requires two structural features: a sufficiently activated C–H group and a ballast group at the other end of the molecule that provides stabilization via close pack<strong>in</strong>g For the cubane acids, the R-group only needs to provide steric bulk For the phenylpropiolic acids, the R-group needs to provide both steric bulk and electronic activation
Page 1 and 2: Weak hydrogen bonds in crystal engi
Page 3 and 4: Crystal engineering The practical q
Page 5 and 6: How would we expect molecular and c
Page 7 and 8: What synthons are possible? O H O O
Page 9 and 10: Synthon hierarchy O H O O H O N H H
Page 11 and 12: Multipoint recognition H N N N H H
Page 13: A functional crystal O 2 N H NO 2 B
Page 20 and 21: syn-anti Catemer in 4-chlorocubanec
Page 22 and 23: Different molecules, same crystal s
Page 26 and 27: Stereoelectronic effects in the sol
Page 28 and 29: Hydrogen bond The master-key of mol
Page 30 and 31: C-H…O Hydrogen Bonds in the Nucle
Page 32 and 33: Conclusions The C-H…O and other

Weak hydrogen bonds in crystal engineering

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