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- W2359674080 abstract "Langmuir-Blodgett films of tetra- tert-butyl naphthaicoyamnatozinc (ttb - Nc ), which is a novel symmetrically substituted naphthalocyanine derivative, have been fabricated by horizontal lifting technique and their structures have been characterized by the π-A isotherm, electronic absorption spectra, small-angle X-ray diffraction, coupled with the information deduced from the second-order nonlinear optical properties of the compound in the LB films. It concludes that LB films with good layer structure have came into being with the ttb-Nc molecules arranged themselves with H-aggregation, which is different from the conventional type one due to the macrocyclic planes of the ttb-Nc molecules in the aggregations have an incomplete overlapped configuration. Namely, the angle between the axis of this column-like H-aggregation of the ttb-Nc molecules and the macrocyclic planes of the compound is not just 90~o. A staggered process for the ttb-Nc molecules to take this form of H-aggregation has been found after its solution spread onto the subphase surface. Particularly, second harmonic generation (SHG) from the LB films has also been detected. The macroscopic second-order susceptibility (X(2)) as well as the molecular hyperpolarizability (β) of the LB films for the compound under the experimental condition were estimated to be X(2) = l' 1 ~ 2. 5 x 10 -9esu and β= 2. 1 ~ 4. 7 x 10-31esu, respectively. In spite of the moderate high values of these two data, the research work expands the investigation field for the SHG materials." @default.
- W2359674080 created "2016-06-24" @default.
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- W2359674080 date "2001-01-01" @default.
- W2359674080 modified "2023-09-26" @default.
- W2359674080 title "A Novel Symmetrically Substituted Naphthalocyanine: Structure Character of LB Films and Second-Order Nonlinear Optical Properties" @default.
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