Free-base and metallated bis-tetraphenylporphyrin covalent ensembles for optical power limiting

Nonlinear absorption of metallated tetraphenylporphyrin (TPP), halogene substituted TPP and bisTPP covalent ensembles is studied in a wide spectral range of visible and infrared light. Advantages of complexation with Pb and -conjugation of bis-porphyrin ensembles for reverse saturable and two-photon absorptions were demonstrated. The compounds are useful for optical power limiting applications. Keywords—porphyrins; metalloporphyrins; porphyrin covalent ensemples; nonlinear absorption; optical power limiting