Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Understanding the Two-Photon Absorption Spectrum of PE2 Platinum Acetylide Complex

Full text
Author(s):
Vivas, Marcelo G. [1, 2] ; De Boni, Leonardo [1] ; Cooper, Thomas M. [3] ; Mendonca, Cleber R. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Fis Sao Carlos, Grp Foton, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Alfenas, Inst Ciencia Tecnol, BR-37715400 Pocos De Caldas, MG - Brazil
[3] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 - USA
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry A; v. 118, n. 30, p. 5608-5613, JUL 31 2014.
Web of Science Citations: 9
Abstract

Herein, we report on the two-absorption cross-section spectrum of trans-Pt(PBu3)(2) (C equivalent to C-C6H4-C equivalent to C-C6H5)(2) (PE2) platinum acetylide complex employing the femtosecond wavelength-tunable Z-scan technique. The PE2 complex can be visualized as two branches containing two phenylacetylene units, each one linked by a platinum center, completely transparent in the visible region. Because of this structure, large delocalization of pi-electrons allied to the strong intramolecular interaction between the branches is expected. The 2PA absorption spectrum was measured using the femtosecond wavelength-tunable Z-scan technique with low repetition rate (1 kHz), in order to obtain the 2PA spectrum without excited-state contributions. Our results reveal that PE2 in dichloromethane solution presents two 2PA allowed bands located at 570 and 710 nm, with cross section of about 320 and 45 GM, respectively. The first one is related to the strong intramolecular interaction between the molecule's branches due to the presence of platinum atom, while the second one is associated with the breaking of symmetry of the chromophore in solution due, most probably to a large twisting angle of the ligand's phenyl rings relative to the Pt core. (AU)

FAPESP's process: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
Grantee:Cleber Renato Mendonça
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 11/06489-6 - EFFECT OF THE ULTRASHORT PULSE POLARIZATION ON THE TWO-PHOTON ABSORPTION OF ORGANIC COMPOUNDS
Grantee:Marcelo Gonçalves Vivas
Support Opportunities: Scholarships in Brazil - Post-Doctoral