Lecture 1 Text Notes noncovalent interactions

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Stavroula Andreopoulos

Lecture 1 Text Notes – Non Covalent Interactions Non-Covalent Forces - hydrogen bonds - ionic attractions - van der Waals forces - hydrophobic interactions Weak Chemical Forces/Noncovalent Bonds - intra/intermolecular attractions between atoms - typically range 4-30 kJ/mol - not strong enough to bind free atoms together - interactions constantly forming and breaking Van der Waals - result of induced electrical interaction between atoms and molecules as their negatively charges electron clouds fluctuate instantaneously in time - fluctuations allow attractions between positive nuclei and negative electrons of the two atoms - strength 0.4-4.0 kJ/mol, distance 0.3-0.6 nm - strength depends on relative size of the atoms or molecules and their distance apart - repulsive van der Waals forces can occur when two atoms approach too closely - between repulsive and attractive domain, there is a van der Waals contact distance – the interatomic distance between two atoms for the lowest energy – sum of their van der Waals radii Hydrogen Bonds - form between hydrogen atoms covalently bonded to an electronegative atom and a second electronegative atom that serves as the hydrogen bond acceptor - strength 12-30 kJ/mol
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