Optical Limiting Properties of Zinc- and Platinum-Based Organometallic Compounds

Abstract

Optical power limiting is theoretically studied using an approach that combines quantum electronic structure calculations of multiphoton excitations and classical calculations of dynamical wave propagation. We illustrate the capability of such a combined approach by presenting results for a couple of organometallic compounds; basic metal-base porphyrins, vinylphenylamine porhyrin, and the so-called type IVc platinum compound. A comparative analysis of their electronic properties related to nonlinear absorption of electromagnetic radiation and their optical limiting capability has been performed based on dynamical simulations of the nonlinear pulse propagation taking account of resonant as well as off-resonant effects. Several key features and ratelimiting steps in the transmission have been examined in relation to various characteristics of the pulse. It is found that the resonant vs off-resonant conditions, the saturation conditions and the dephasing play critical roles for the nonlinear transmission. The saturation effects are sensitive to the pulse duration, the intersystem crossing rate and the quenching of the higher triplet state. The inter-system crossing rate has to be comparable with the inverse pulse duration in order to boost the stepwise two-photon channel associated with singlet-singlet followed by triplet-triplet transitions. It is illustrated that structure-to-property relations of the rate-limiting steps serve as important criteria for choices of compounds suitable for the application of interest.

Depth Profiling (ICP-MS) Study of Trace Metal ‘Grains’ in Solid Asphaltenes

“…Therefore, treatment of asphaltenes in terms of demetallization and in other processes could change on this basis. Organometallic structures of similar nature are well known, and of increasing interest in various areas of chemistry [7][8][9][10][11][12][13][14]. The existence of such metal 'grains' at random points in the asphaltene matrix is unexplored and could open up a new area of study and interesting possibilities, for example using the metal-containing asphaltene as in situ catalysts for workup procedures [15].…”

A Graphene Hybrid Material Covalently Functionalized with Porphyrin: Synthesis and Optical Limiting Property

“…[16] The extensive 2D 18 p-electron porphyrins and porphyrin-modified acceptor nanoparticles exhibit good optoelectronic properties. [17][18][19][20][21][22] Therefore, it is expected that, by combining 2D nanometer-scale graphene with optoelectronically active porphyrin moelecules, multifunctional nanometer-scale materials for optical and/or optoelectronic applications may be generated. In this paper, we report the first organic-solution-processable functionalized-graphene (SPFGraphene) hybrid material with porphyrins, and its photophysical properties including optical-limiting properties.…”

Nonlinear absorption properties of 5,10-A2B2porphyrins—correlation of molecular structure with the nonlinear responses

“…7 Relevant research in this area focuses on the synthesis of new compounds, 8 materials composition, 9 and a better understanding of complex NLO responses. 7,10 Significant progress has been made in the improvement of the OL performance of porphyrins since the first observation of the OL effect in TPP in 1985. 5,11,12 Most studies focused on highly symmetric meso tetrasubstituted compounds and a few reports on meso and β-substituted compounds or 5,15-A 2 B 2 -type porphyrins have been published.…”