Associated XH Frequencies, the Hydrogen Bond

摘要: Hydrogen bonds are formed in any XH... Y system which the XH bond has some polarity and atom basicity. The strength of hydrogen depends upon both these functions, so that for example, vOH frequency shift dimer phenol is little different from methanol, greater acidity one being counterbalanced by basicity other. ability an to associate this way directly linked its ionic character electronegativity X atom. halogen acids, OH groups a lesser extent NH strong donors, whereas SH, PH CH links usually form only weak bonds. requirements proton acceptor less well defined, but bonding normally involves lone pair electrons or π cloud.