A topological approach to the analysis of isomeric dendrimers by considering their molecular graphs has been applied to correlate various properties of a series of new sulfonimide-based isomeric dendrimers with their structures. According to this approach isomeric dendrimers are referred to as either isographic, that is, having the same graph, or non-isographic, that is, having different graphs. Six sets of non-isographic isomeric dendrimers with four to ten peripheral groups and one set of three isographic isomers with eight peripheral groups have been designed, synthesized and investigated with regard to their melting, solubility, separation, NMR spectroscopic and mass spectrometric characteristics. The results are discussed in the light of the graph-dependent and-independent properties of the isomers.