Third order NLO and second hyperpolarizability of functional porphyrin based polyimides

Porphyrin-POM hybrid materials with excellent NLO properties are supposed to be a worthy entrant for forthcoming telecommunication, optical fibers, optical data storage and optical limiting devices, but due to adverse solubility problems, they are replaced by polymeric materials. Herein, we assessed third order NLO and second hyperpolarizability of porphyrin-polyimide compounds (NH-PI and Zn-PI) synthesized from the reaction of 4,4'-MODIFIER LETTER PRIME-hexafluoroisopropylidene-diphthalic anhydride (6FDA) with C44H(32)N(6) (NH-DATPP) and C44H30N4Zn (ZnDATPP) porphyrins under ambient conditions. The Z-scan measurement of these compounds revealed reverse saturation absorption as well as self-defocusing performance. Zn-PI showed an enhancement in gamma value (2.214 x 10(-29) esu) as compared to the NH-PI (1.879 x 10(-29) esu) revealing significant role of Zn ion in charge transfer process. On the other hand, Zn-DATPP exhibited chi((3)) value of 7.829 x 10(-11) esu which is significantly lower than the value seen for the compound NH-DATPP (15.649 x 10(-11) esu) showing inverse effect due to ruffled deformation in normal coordination structure of metalloporphyrin. Furthermore, this work provides a pave to modulate the NLO response by fine structural modification in porphyrin-polyimides.

Automated summary

Due to solubility issues, porphyrin-POM hybrid materials with excellent NLO properties are replaced by polymeric materials. This study evaluates the third order NLO and second hyperpolarizability of porphyrin-polyimide compounds. The results reveal the significant role of Zn ion in charge transfer process and the inverse effect due to ruffled deformation in the normal coordination structure of metalloporphyrin.