Large Concentration-Dependent Nonlinear Optical Responses of Starburst Diphenylamino-fluorenocarbonyl Methano[60]Fullerence Pentaads
Abstract
We demonstrated an approach toward the design of starburst C60-keto-DPAF assembly by applying a combination of a starburst macromolecular configuration with C60 as the core center, which is encapsulated by multiple bulky groups leading to the increase of intermolecular separation and aggregation barrier. Molecular compositions of the resulting triad and pentads were clearly confirmed by MALDI-MS (positive ion) detection of protonated molecular mass ions. Both structural isomers, 3a and 3b exhibited nonlinear optical transmittance reduction responses in femtosecond (fs) region with a lower transmittance % value for the latter at the high laser power above 80 GW/sq cm. It was attributed to larger fs 2PA cross-section values of 3a and 3b than that of 2 in the same concentration and, apparently, correlated to a higher number of DPAF-C9 subunits in the structure of 3.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2006
- Accession Number
- ADA466119
Entities
People
- Hendry I. Elim
- Long Y Chiang
- Loon-Seng Tan
- Rachel Jakubiak
- Robinson Anandakathir
- Wei Ji
Organizations
- National University of Singapore