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Effects of metal substitution on third-order optical non-linearity of porphyrin macrocycle

✍ Scribed by K. KANDASAMY; SHANKAR J. SHETTY; P. N. PUNTAMBEKAR; T. S. SRIVASTAVA; T. KUNDU; BHANU P. SINGH

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
67 KB
Volume
03
Category
Article
ISSN
1088-4246

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✦ Synopsis

The effects of axial ligands in Sn(IV)-substituted 5,10,15,20-tetrakis [4-(carboethoxymethyleneoxy)phenyl]porphyrin and divalent transition metal substitution in 5,10,15,20-tetraphenylporphyrin on the second molecular hyperpolarizability (g) at 802 nm were studied using the Z-scan technique. A significant increase in g for divalent metal ions is observed with decreasing d-shell occupancy. In the case of the tetravalent metal-substituted porphyrin a dramatic enhancement of g is seen when a strongly electronegative axial ligand such as I 2 is attached to the metal ion. A plausible explanation for the observed trend of g has been sought in terms of metal-ligand interaction.

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