Affiliation:
1. College of Chemistry, Zhengzhou University, Zhengzhou 450001, P.R. China
2. Henan Institute of Advanced Technology,
Faculty of Fengqi Guo, Zhengzhou University, Zhengzhou 450001, Henan Province, P.R. China
Abstract
Background:
The nonlinear optical properties of ferrocene-containing metalloporphyrins
toward pico-second laser were studied using calculational and experimental methods, and the relationship
between their structures and nonlinear absorption properties were discussed.
Aims:
The metal ions introduced into the porphyrin rings intensively affect the nonlinear optical properties.
Methods:
The nonlinear optical properties and the relationship between the property and the structure
of the synthesized ferrocene-containing metalloporphyrins are studied using the calculational method
and the open-aperture Z-scan technology for pico-second laser.
Results:
The Z-scan results show that Co-P-Fc, Zn-P-Fc and Pd-P-Fc exhibit reverse saturable absorption
characteristics toward the laser with 532 nm wavelength and 21 ps pulse width, and the nonlinear
absorption coefficients (β) of them were 4.1, 3.2 and 1.3 cm/GW, respectively, when the incident laser
fluency at the focal point of the lens is 29 mJ/cm2. In addition, the values of β decrease with the increase
of the incident laser fluency. These results indicate that the nonlinear absorption characteristics
of Co-P-Fc, Zn-P-Fc and Pd-P-Fc are ascribed to the excited state absorption (ESA). However, Cu-PFc,
Ni-P-Fc and P-Fc show saturated absorption characteristics toward the ps laser pulse.
Conclusion:
To elucidate the intrinsic factors that influence the nonlinear optical properties, the electronic
distribution, flow of charge density during the transition from the ground state to the excited
state, and the first-order hyperpolarizability values (β) are calculated using the time-dependent density
functional theory (TD-DFT). The calculated results show that the molecular polarity and the change of
the molecular polarity before and after the transition from HOMO to LUMO, which is dominated by
the redox potentials of the introduced metal ions, are the most important factors that affect the nonlinear
optical properties of the title compounds.
Publisher
Bentham Science Publishers Ltd.
Subject
Organic Chemistry,Biochemistry
Cited by
1 articles.
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