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. Author manuscript; available in PMC: 2013 Feb 14.
Published in final edited form as: J Phys Chem B. 2008 Jul 12;112(31):9346–9353. doi: 10.1021/jp8013783

Figure 1.

Figure 1

Atomic structure of first-generation (G1) PAMAM dendrimer and terminal groups: protonated primary amine (–NH3+), uncharged acetamide (–Ac), and deprotonated carboxylic acid (–COO−). There are 32 terminal groups per G3 dendrimer, and they are all modified to become +32e charged G3–NH3+, uncharged G3–AC, and the –32e charged G3–COO−. Note that the G1 PAMAM dendrimer illustrated has eight terminal groups (the –NH2 groups on the largest concentric circle). The remaining functional groups are referred to in the text as internal dendrimer moieties as defined in Figure 4.