[Simon]

Hi,

I would like to know if there are any materials which do not have a single bond type. If yes, what are they? And where can I find some information please ?

Thanks beforehand 

[shelanachium]

Very many indeed! Consider any salt where one or both ions is polyatomic, for example ammonium chloride, calcium sulfate, or ammonium sulfate. The boding between (for example) the ions [NH4]+ and [SO4]2-, is ionic, but the bonding WITHIN the ions (the N-H bonds in ammonium, and the S-O bonds in sulfate) are covalent. This should be covered in any elementary text.

[sjb]

Taking shelanachium's point further, I'd suggest that majority of compounds do not have "a single bond type" - even simple things like propane have C-C, and C-H bonds, which are different.

Perhaps this is a bit over the top for "High School Chemistry" though? 

S

[Structuralist]

furthermore you can take as an instance the p-Nitrophenyl Sulfate Potassium Salt, here you have plenty of examples from unlocalized p electrons to "simple" C-H bonds

[cliverlong]

Some I can think of

Aluminium (III) Chloride AlCl₃ / Al₂Cl₆ : where the bonding between aluminium and 3 chlorines is covalent to form AlCl₃. Then two dative covalent bonds between separate Al and Cl to form Al₂Cl₆


Benzene: Sigma and delocalised pi bonds between carbon atoms in main ring.


Grignard reagent used in extending carbon chains: Magnesium to halogen bond is ionic, carbon to carbon in alkyl chain is covalent and magnesium to carbon is something in between.

[jaysawatzki]

http://en.wikipedia.org/wiki/Ionic_bond

Pure ionic bonding is not known to exist. All ionic bonds have a degree of covalent bonding or metallic bonding. The larger the difference in electronegativity between two atoms, the more ionic the bond. Ionic compounds conduct electricity when molten or in solution. They generally have a high melting point and tend to be soluble in water.

Correct me if this isn't what you are looking for.