Synthesis, Magnetic, Spectral and Therhal Studies on Iietal(II) 1,8,15,224 Tetrantrophthalocyanines

Synthesis, characterizations and biological studies of symmetrically substituted 2, 9, 16, 23-tetra-hydroxyphenylimino phthalocyanine complexes

“…The observed deep bluish green color of the complexes may be due to a 2u 0 e g and b 2u 0 e g transitions (22). For all the complexes, absorption bands were observed in the wavelength range 732Á770 nm, which were considerably higher than the corresponding parent metal phthalocyanines (21). This observed red shift was attributed to the increase in conjugation of p-electrons of the phthalocyanine molecule with that of peripherally substituted aromatic imino groups.…”

“…The nitro derivative of the complex was converted into amino derivative quantitatively by reduction using sodium sulfide nonahydrate in aqueous medium (19). The finely powdered cobalt (II) 2, 9, 16, 23-tetra-amino phthalocyanine (MÁPcTA) (6.30 g, 0.01 mole) was dissolved in DMSO and stirred with respective molar quantity of salicylaldehyde (4.9 ml, 0.01 mole).…”

“…Pure 4-nitrophthalic acid was prepared by using phthalic anhydride by adopting the procedure reported elsewhere (19). All other chemical reagents were used as received.…”

“…The procedure adopted for the synthesis of cobalt (II) 2, 9, 16, 23-tetra-nitro phthalocyanines (MÁPcTN) was reported elsewhere (21). The nitro derivative of the complex was converted into amino derivative quantitatively by reduction using sodium sulfide nonahydrate in aqueous medium (19).…”

“…Various spectroscopic properties can be altered by changing the central metal ion as well as by introducing the different substituents at the peripheral positions of the phthalocyanine ring. Even though the information on synthesis and structural investigations of metal (II) 2, 9, 16, 23-tetra-amino phthalocyanines (19) and the synthesis and properties of some novel salicylaldehydeÁtetra-amino phthalocyanine Schiff base metal complexes were documented (20) in the literature, to our knowledge no evidence is available on the syntheses and structural studies on metal (II) 2, 9, 16, 23-tetra-imino phthalocyanines starting from the respective amino phthalocyanine complexes.…”