The relative formula mass of 1was determined using mass spectrometry. Figure 4shows the MALDI mass spectrum of 1. The peak with the highest intensity has mass to charge ratio of 1263 which corresponds to the molecular weight of 1. The mass spectrum shows the presence of small impurities of lower and higher molecular masses. These impurities were also confirmed in elemental analysis (Table 1) and 1H-NMR (Figure 5). The elemental analysis data of 1is shown in Table 1. The expected elemental analysis was fitted by including water and DIPEA in the percent composition. DIPEA was used in the second step of the reaction (Scheme 1) and water was used for washing. It seems that 1traps molecular impurities due to its “polar” properties. 1is very hydrophilic due to its charged 3 SO groups, and water may adhere via intermolecular forces. 1 is also very hydrophobic due to its large and bulky tritylaniline groups. 1H-NMR of 1is shown in Figure 5. The suggested proton assignments of 1are demonstrated within the figure. It is evident from the spectrum that several peaks in the aromatic region (7.5 - 8.5 ppm) are very broad. This indicates that 1may form aggregates in solution that result in poor peak resolution. The doublet at 7.1 ppm may arise from the ethylene protons overlapping with two protons at the meta position of the first aromatic ring of the tritylaniline.