The 50 mL RBF charged with compound 3.PF6 (0.3 g, 0.61 mmol) and dissolved in acetonitrile (25 mL). Then, the reagent 1-(3-aminopropoxy)-2-methoxyethane (0.16 g, 0.92 mmol) was added to the mixture with continuous stirring of the reaction. The reaction mixture was heated to refluxing temperature for 6 -8 hours and the consumption of the reactants confirmed by MALDI-TOF. After completion, the heating was removed and reaction is allowed to cool down to room temperature. Then, the crude mixture was slowly transferred to the 0.2 M KPF6 (aq.) (500 mL) solution under vigorous stirring to avoid lumps formation. The suspension was set aside for precipitation and then precipitates were collected by filtration as crude product. Further purification was done by using column chromatography (MeOH:DCM, 2:8) and desired product 4.PF6 procured as red colored solid. Yield = 0.27 g (0.45 mmol, 73%).