Synthesis and Characterization of Some Manganese Complexes of 5,10,15,20-Tetrakis (4-n-Dodecylphenyl)Porphyrin

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Abstract
The mesomorphic properties of 5,10,15,20-tetrakis(4-n-dodecylphenyl) porphyrin and its divalent metal complexes are well documented. Also, some trivalent metal complexes have been considered. In this work, the chloromanganese(III) complex of tetrakis(4-n-dodecylphenyl)porphyrin was synthesized and its thermotropic behaviour was observed. The tetracyanoquinodimethane(TCNQ) complex was also prepared by metathesis between chloro manganese porphyrin and Li+(TCNQ−.). Magnetic susceptibility measurements were performed on this complex. The chloromanganese(III) complex showed a substantial depression of clearing point over the equivalent divalent complexes. However, although both crystalline and mesomorphic phases could be observed a reproducible phase transition was not seen. Furthermore, the clearing transition was irreversible under a heating/cooling rate of 5 deg/min. X-ray diffraction measurements showed an increase in the ordering of the mesophase upon heating.