Two pure isomers, 2,9,16,23-tetraamino-phthalocyanine zinc(II) and 1,8,15,22-tetraaminophthalocyanine zinc(II), have been prepared in two steps from 4-nitro-o-phenyleneimine and 3-nitro-phthalic anhydride respectively and without using chromatographic fractionation. The synthesized compounds were characterized by using H-1 NMR MALDI-TOF MS and solution phase electronic (UV-Vis) spectroscopy. Dipolymers in their DMF solution and stability of their amino-group antioxidation were confirmed by mass spectroscopy. Amino-group kinetic stability in the former isomer molecule and thermodynamic stability and intra molecular hydrogen bond in the latter isomer molecule were concluded through discussing their H-1 NMR and UV-Vis spectroscopy.