Two-photon 3-D data storage: Photochromic reactions of two diarylethene derivatives under one- and two-photon excitation

ORGN 616

Claudia C. Corredor, ccorredo@mail.ucf.edu1, Kevin D. Belfield, belfield@mail.ucf.edu2, Mykhailo V. Bondar, mike_bondar@hotmail.com3, Ion Cohanoschi4, Florencio E. Hernandez4, and Olga V. Przhonska3. (1) Department of Chemistry, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 162366, Orlando, FL 32816-2366, (2) Department of Chemistry and CREOL, College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 162366, Orlando, FL 32816-2366, (3) Department of Photoactivity, Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauki 46, Kiev, Ukraine, (4) Department of Chemistry and College of Optics and Photonics: CREOL and FPCE, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816
Photochromic properties of the diarylethene two diarylethene derivatives 1 and 2 were investigated under one- and two-photon excitation. The peculiarities of the steady-state excitation anisotropy and the quantum-chemical calculations (AM1, ZINDO/S) of (1) revealed a nature of the broad absorption spectrum of the open-form of 1, as a strongly overlapped mixture of the several electronic transitions. The quantum yields of cyclization and cycloreversion reactions of 1 and 2 were obtained in the broad spectral range, and photochemical stability of 1 was determined for different excitation wavelengths. Two-photon absorption (2PA) spectrum of the open-form of 1 with maximum cross-section 80 GM at 337 nm was obtained by up-converted fluorescence method. 2PA cross-section of the open form of 2 at 260 nm was 88 GM at 260 nm and of the close form of 2 at 680 (153 GM) and 750 (145 GM) were determined. The evidences of two-photon induced cyclization reaction of 1 and 2 were shown under picosecond excitation, and corresponding reaction quantum yield was estimated.

 

Materials, Devices, and Switches
8:00 AM-12:00 PM, Thursday, 30 March 2006 Georgia World Congress Center -- Georgia Ballroom 2, Oral

Division of Organic Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006