Synthesis and characterization of tin ( II ) 5 , 10 , 15 , 20-tetrakis ( 4-phenylbenzoate ) porphyrin and tin ( II ) 5 , 10 , 15 , 20-tetrakis ( 4-[ 1 , 1 ʹ-biphenyl ]-4 ylbenzoate ) porphyrin

Herein we reported the synthesis and characterization of a new type of metalloporphyrins, tin(II)5,10,15,20-tetrakis(4-phenylbenzoate)porphyrin and tin(II)5,10,15,20-tetrakis(4-[1,1ʹ-biphenyl]-4ylbenzoate)porphyrin. We identified the products by FT-IR and UV-Vis techniques. The photocatalytic degradation of methylene blue under visible light irradiation is investigated by the photocatalysts sensitized with 5, 10, 15, 20 tetrakis(4-carboxyphenyl)porphyrin We investigated the effect of functional groups phenol and 1, 1ʹ-biphenyl – 4– ol in photocatalytic degradation of methylene blue under visible light irradiation in the same conditions.


Introduction
Porphyrins are very important structural components in the life on our planet, and also the essential components in the chemistry processes [1].The studies of porphyrins and metalloporphrins have had great concern during the past years in particular part of chemistry [2].Due to their broad applications in light absorption and photoelectric activity, porphyrin derivatives are a favorable photoactive agent for various applications, such as solar energy conversion, medical imaging, photocatalytic activity and photocatalytic processes [3].It should be noted that photocatalysis is a low-cost intermittent method for the purification of contaminated water compared with other technologies [4].Recently, there have been several attempts to enhance visible photocatalytic activity of metalloporpyrins.Metalloporphyrins with different functional groups (-COOH, -OH, etc.) in the porphyrin structure have been utilized as photocatalysts for pollutant photodegradation [5].
In the present work, synthesis of new kinds of metalloporphyrins have been reported and then photocatalytic degradation of methylene blue catalyzed by these new structural metalloporphyrins have been investigated.

Photocatalytic activity
The process of photocatalytic degradation of organic dyes methylene blue with concentration 10 ppm (10 ml) in the presence of photocatalysts (1 gL -1 ) were evaluated for 3h and done with Shimadzu UV-1700 spectrophotometer.

Result and Discussion
In order to explain synthesis of new of metalloporphyrins, we chose a reaction (Scheme 1) to show that the effect of functional groups in metalloporphryins structure can be efficient in photocatalytic degradation [6].

Conclusion
Porphyrins are stable molecules with a macrocyclic conjugated system that increase the photodegradation.We synthesis two kind of porphyrins with different functional groups and the conjugated system would be spread.The photocatalytic degradation of MB by these porphyrins was studied under visible light irradiation.The obtained results indicate that the photodegradation of methylene blue was affected by the initial MB concentration and type photocatalyst.The photocatalytic activity of 5,10,15,20-tetrakis(4-[1,1ʹbiphenyl]-4ylbenzoate)porphyrin was higher than photodegradation tin(II) 5,10,15,20-tetrakis(4-phenylbenzoate) porphyrin.
Scheme 1. Synthesis of new porphyrins derivatives