An "improper" form of this phenomenon typically arises only in the presence of weakhyperconjugation, and is characterized by 
An "improper" form of this phenomenon typically arises only in the presence of weakhyperconjugation, and is characterized by a blue-shifted stretching frequency. In molecularmechanics, this phenomenon is modeled by a 10,12 potential, a variant of the Lennard-Jonespotential. The (*) bifluoride anion exhibits a strong form of this phenomenon as part of a three-centerfour-electron bond. The "i plus k to i" interaction in polypeptides is an example of this phenomenon, andwhen k equals four, corresponds to an alpha helix. For 10 points, name this phenomenon in which anelectronegative atom and a namesake element interact weakly, which explains the high boiling point ofwater.
An "improper" form of this phenomenon typically arises only in the presence of weakhyperconjugation, and is characterized by a blue-shifted stretching frequency.
hydrogen bonding