Re: TOJC - lecture
Desmondo (ottende@PLU.edu)
Mon, 23 Sep 1996 11:40:41 -0800 (PST)
In regards to a hydrogen being "bonded to a heteroatom and
another heteroatom," what was ment was this. Hydrogen is COVALENTLY or
IONICLY bonded to a heteroatom (Cl, F or N for example) Since these
heteroatoms tend to be more electronegative than Hydrogen, and Dipole
moment results with the Hydrogen pole of the molecule being partially
positive and the heteroatom being partialy negative. Thus the second
bond the slightly positive hydrogen makes is a dipole-dipole bond
(specifically a hydrogen bond) to a slightly negative heteroatom in
another molecule. The key to this is understanding that a dipole-dipole
or hydrogen bond IS ACTUALLY a type of bond, however weak and
impermanent. Covalent and Ionic bonds are not the only bonds that
exist. Thus the two bonds are a covalent or ionic bond to one
heteroatom, and a hydrogen or dipole-dipole bond to another.