In synthesizing PbS nanocrystals will there be any problems if I use lead IV acetate instead of lead II acetate? I am just about to start my senior project synthesis of PbS quantum dots and we ordered the wrong lead acetate. The method calls for lead (II) acetate and we got lead (IV) acetate. If we use the lead (IV) acetate will our synthesis be contaminated and not work or can we still use that chemical with two extra acetates attached?
You might run into problems. $\ce{Pb(OAc)4}$ is a pretty strong oxidant! 

What will be your sulfide source? Are you sure that it isn't oxidized these conditions?

Edit 1

At least N,N'-diarylthioureas are efficiently desulfurized by lead tetraacetate and furnish ureas (and sulfur) via a carbodiimide intermediate, see Bull.Chem. Soc. Jpn., 1984, 57, 315-316.

Edit 2
If you don't mind a personal advice: I wouldn't want to add complexity to the protocol just to maneuver around problems (and create others) I wouldn't have if I were using the right starting materials in the first. (The German term for that is verschlimmbessern, which translates to something like disimprove).