NDLI: Ultrafast spectroscopy of dinaphthylpolyynes

Content Provider	IEEE Xplore Digital Library
Author	Fazzi, D. Scotognella, F. Milani, A. Brida, D. Manzoni, C. Cinquanta, E. Ravagnan, L. Milani, P. Cataldo, F. Negro, M. Stagira, S. Vozzi, C.
Copyright Year	2013
Description	Author affiliation: Dipt. di Fis., Univ. degli Studi di Milano, Milan, Italy (Cinquanta, E.; Ravagnan, L.; Milani, P.) \|\| Ist. di Fotonica e Nanoteconologie, Milan, Italy (Manzoni, C.; Vozzi, C.) \|\| Center for Nano Sci. & Technol. CNST@Polimi, Ist. Italiano di Tecnol., Milan, Italy (Fazzi, D.; Scotognella, F.) \|\| Dipt. di Chim., Mater. e Ing. Chim. “G. Natta”, Milan, Italy (Milani, A.) \|\| Actinium Chem. Res. s.r.l., Rome, Italy (Cataldo, F.) \|\| Dipt. di Fis., Politec. di Milano, Milan, Italy (Brida, D.; Negro, M.; Stagira, S.)
Abstract	Summary form only given. We investigated experimentally and theoretically the photo-physical properties of a class of linear sp-carbon chains, the α,ω-dinaphthylpolyyne Ar-C2n-Ar, where Ar is the naphthyl group and n is the number of triple bonds. The dynamics of the excited states has been investigated by ultrafast transient absorption spectroscopy and DFT//TDDFT calculations.We found that the role of molecular conformers, in which end-capped naphthalene rings are planar or perpendicular to the polyyne plane, is fundamental for understanding the steady state properties, like the UV-Vis absorption spectra and vibronic transitions, and the ultrafast transient absorption features. Owing to DFT//TD-DFT analysis, we were able to quantify the contributions of each conformer in the UV-Vis absorption spectra (not shown in the figure). Accordingly ultrafast transient absorption measurements revealed the excited states spectral features and dynamics. Figure 1(a) shows the 2D map of the pump-probe signal. The excitation pulse was 150-fs long and centered at 390 nm while the probe pulse was supercontinuum white light from 450 to 750 nm. Figure 1(b) shows two cuts of the 2D map for two different wavelengths. Over the whole spectral bandwidth it is possible to observe a broad photo-induced absorption, which appears instantaneously upon impulsive photo-excitation. A photo-induced absorption signal forms at 600 nm with a time constant of 30 ps and a narrow-band spectral shape.In light of DFT//TD-DFT, these features can be assigned to different transitions. The photo-induced absorption with a fast formation time can be assigned to optical transitions from the excited singlet state to higher molecular singlet levels. The narrow feature centered at 600 nm can be related to an intersystem crossing event bringing to the formation of a triplet state followed by transition between triplet states. In this picture the conformers play a prominent role: we observed a selective pathway of triplet formation, determined by the peculiar conformational structure of dinaphthylpolyyne in the ground state. Understanding the role of end-capped groups opens the way for other possible chemical functionalizations of sp-carbon chain systems in order to govern their chemical stability and allow optical control of their photo-excited properties.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	297738
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6801026
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Absorption Discrete Fourier transforms Transient analysis Probes Carbon Chemicals
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Eigensystem spectrum estimation methods applied to absorption interferometric spectroscopy

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes.

Evaluate the Quality of Tagetes ercta Petal by Fourier Transform Infrared Spectroscopy

Ultrafast transient absorption spectroscopy of matrix-isolated perylene-related molecules

Ultrafast photochemistry of chlorine dioxide in water studied by femtosecond transient absorption spectroscopy

Ultrafast photochemistry of chlorine dioxide in water studied by femtosecond transient absorption spectroscopy

Femtosecond transient absorption spectroscopy of single-walled carbon nanotubes and their ultrafast optical switching behavior.

Ultrafast spectroscopy of dinaphthylpolyynes

Similar Documents

Eigensystem spectrum estimation methods applied to absorption interferometric spectroscopy

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes

Ultrafast spectroscopy of linear carbon chains: the case of dinaphthylpolyynes.

Evaluate the Quality of Tagetes ercta Petal by Fourier Transform Infrared Spectroscopy

Ultrafast transient absorption spectroscopy of matrix-isolated perylene-related molecules

Ultrafast photochemistry of chlorine dioxide in water studied by femtosecond transient absorption spectroscopy

Ultrafast photochemistry of chlorine dioxide in water studied by femtosecond transient absorption spectroscopy

Femtosecond transient absorption spectroscopy of single-walled carbon nanotubes and their ultrafast optical switching behavior.

Ultrafast spectroscopy of dinaphthylpolyynes