Nonlinear optical behavior of metal octaphenoxy phthalocyanines: effect of distortion caused by the central metal

Sanusi, Sikiru O.; Antunes, Edith; Nyokong, Tebello

doi:10.1142/s1088424613500715

Cited by 20 publications

(10 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured β eff values were plotted against the sample concentrations at I 00 of~0.21 GW cm −2 (figure 5). It can be clearly seen that β eff increases in magnitude as the concentration of each sample increases; phthalocyanine 4 exhibits the largest effective NLA coefficient (β eff ) of 372 cm GW −1 at 1.0 × 10 −4 M. The increase in magnitude of the β eff as the concentration increases suggests direct relationship between the β eff and the available sequential photon absorptions induced by RSA at the excited triplet states [42]. This confirms the 2PA-dependent RSA as the dominant mechanism responsible for the observed nonlinearity for the complexes in solution.…”

Section: Z-scan Measurements In Solutionmentioning

confidence: 91%

Mercaptopyridine-substituted indium, zinc, and metal-free phthalocyanines: nonlinear optical studies in solution and on polymer matrices

Bankole

Nyokong

2015

Journal of Coordination Chemistry

Self Cite

View full text Add to dashboard Cite

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -4 -2 0 2 4 Tra nsm it t a nc e Z (c m )In this article, the nonlinear optical characterizations and optical limiting properties of metal-free (2), zinc (3), and indium (4) tetra 4-(2-mercaptopyridine) phthalocyanines are discussed. Nonlinear optical properties of the samples were evaluated using Z-scan at 532 nm and 10 ns pulse in CHCl 3 , and doped on poly(bisphenol A carbonate) (PBC) thin films. Thin films for 2, 3, and 4 are represented as 2-PBC, 3-PBC, and 4-PBC, respectively. We observed two-photon absorption (2PA) and strong reverse saturable absorption as the dominant mechanisms at nanosecond laser excitation in solution and thin films. By virtue of the magnitude of absorption coefficients and other nonlinear optical parameters estimated in this work, sample 4 was found to exhibit strongest nonlinear optical properties followed by 3, while 2 is the weakest nonlinear absorber of the studied samples. Large third-order susceptibility (1.46 × 10 −9 esu and 7.74 × 10 −10 esu) and hyperpolarizability (2.13 × 10 −28 and 8.37 × 10 −29 esu) were estimated for 4-PBC and 3-PBC, respectively. Our studies show that these molecules are suitable candidates for practical passive optical limiters.

show abstract

Section: Z-scan Measurements In Solutionmentioning

confidence: 91%

Mercaptopyridine-substituted indium, zinc, and metal-free phthalocyanines: nonlinear optical studies in solution and on polymer matrices

Bankole

Nyokong

2015

Journal of Coordination Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…The excitation source was a diode laser LDH-P-670 with PDL 800-B, 670 nm and 20 MHz repetition rate Picoquant GmbH. Details have been provided before [20]. 1 H nuclear magnetic resonance (NMR) signals were recorded on a Bruker AMX 300 NMR spectrometer.…”

Section: Equipmentmentioning

confidence: 99%

The nonlinear absorption in new lanthanide double decker pyridine-based phthalocyanines in solution and thin films

Sekhosana

Nyokong

2015

Optical Materials

Self Cite

View full text Add to dashboard Cite

“…This behavior is attributed to the central-metal effect. 65 Theoretically, the natural lifetime can be obtained by using the relationship of Strickler and Berg 42,54 :…”

Section: -8mentioning

confidence: 99%

Kinetic model for the molecular system of Zinc(II)-2,9,16,23-phthalocyanine tetracarboxylate

Al-Omari

2015

J. Nonlinear Optic. Phys. Mat.

View full text Add to dashboard Cite

Using vis absorption, fluorescence spectral experimental data, and time-resolved measurement, we have examined the kinetics of Zinc(II)-2,9,16,23-phthalocyanine tetracarboxylate (ZnPc(COONa) 4 ), which is interesting photosensitizer of far red-absorption in water:NaOH solution. The kinetic parameters were measured and/or calculated. The photophysical properties originate principally from the planar macrocycle while the outer substituent and degree of carboxylation seem not to have a considerable influence on the kinetic parameters. The nonradiative rate constants of the first excited state were dominant due to the heavy metal effect. Using the obtained photophysical parameters, the population dynamics were calculated by kinetic model. On nanosecond scale of 15 ns, about 63% population of the first excited-singlet state is retrieved by the ground state. Whereas, the rest of population are deactivated to the first excited-triplet state. Later on, during about 7 µs starting from the initial decay of the first excited singlet state, the first excited singlet state and the first excited triplet state were completely empty, meanwhile the ground state retrieved its initial population. Due to the fact that ZnPc(COONa) 4 has strong absorption, long lifetimes of the first singlet and triplet excited states, and fast intersystem crossing, it may be suitable for nonlinear optical studies.

show abstract

Nonlinear optical behavior of metal octaphenoxy phthalocyanines: effect of distortion caused by the central metal

Cited by 20 publications

References 36 publications

Mercaptopyridine-substituted indium, zinc, and metal-free phthalocyanines: nonlinear optical studies in solution and on polymer matrices

Mercaptopyridine-substituted indium, zinc, and metal-free phthalocyanines: nonlinear optical studies in solution and on polymer matrices

The nonlinear absorption in new lanthanide double decker pyridine-based phthalocyanines in solution and thin films

Kinetic model for the molecular system of Zinc(II)-2,9,16,23-phthalocyanine tetracarboxylate

Contact Info

Product

Resources

About