Two kinds of substituted phthalocyaninatozinc, tetra-beta-phthalimidobutoxy phthalocyaninatozinc (1) and tetra-beta-phthalimidomethyl phthalocyaninatozinc (2), were synthesized by mix melting method, which bear the same phthalimide substituents but the linking of the substituents to the phthalocyanine ring is different. The substituent linking to the phthalocyanine ring is one methylene in ZnPc (2), while the substituents linking to the phthalocyanine ring is four methylenes and one ather in ZnPc (1), in which ather is near by phthalocyanine ring. The absorption and fluorescence spectra and the abilities of singlet oxygen generation of these two phthalocyanines were compared with respect to the effect of different linked fashions. The magnitude of the redshift of absorption and fluorescence spectra relative to unsubstituded ZnPc is greater for tetra-beta-phthalimidobutoxy phthalocyaninatozinc (1) than for tetra-beta-phthalimidomethyl phthalocyaninatozinc (2). This result is related to the presence of stronger electron donating peripheral substituents of ZnPc (1), with phiF of (1) is larger than that of (2) and the abilities of singlet oxygen generation of (1) is smaller than that of (2).
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