Paperback Edition
Paperback
225 pages
$25.95
Choose vendor to order paperback edition
BrownWalker Press Amazon.com Barnes & Noble Harvard Book Store Return policy
PDF eBook
Sample Preview
Size 150k
Free
Download a sample of the first 25 pages
Download Preview

Entire PDF eBook
2001k
$17
Get instant access to an entire eBook
Buy PDF Password Download Complete PDF
eBook editions

Photoinduced Intramolecular Charge Transfer in Donor-Acceptor Biaryls and Resulting Applicational Aspects Regarding Fluorescent Probes and Solar Energy Conversion

by Michael Maus
small book icon  Paperback   small ebook icon   eBook PDF
Publisher:  Dissertation
Pub date:  1998
Pages:  225
ISBN-10:  1581120303
ISBN-13:  9781581120301
Categories:  Chemistry  Science  Technology

Abstract

This study is focused on the effects of photoinduced intramolecular charge transfer (CT) in three differently twisted donor-acceptor (D-A) biphenyls. Taking into account a further pair of differently twisted D-A biaryls new universal insights into the photoinduced electronic and conformation dynamics of D-A biaryls are obtained. Furthermore, possible applications in fields of solar energy conversion and fluorescence sensing of microenvironments are demonstrated.

Experimental means of stationary and time-resolved (ps to s) luminescence, transient absorption (sub-ps), polarization spectroscopy, high pressure and low temperature techniques are employed in conjunction with quantum chemical calculations.

Twist angle and solvent dependent electron transfer (ET) interactions between the D and A aryl moieties are responsible for the low lying and solvatochromic intramolecular CT electron band which gains unusually high intensity through strong electronic coupling of the pure 1ET with the ground (S0) and 1La state. As regards the class of biaryl compounds, for the first time, an excited state electron transfer from the D to the A could be monitored by dual spectrally separated stimulated fluorescence bands with precursor-successor relationship on a sub-ps timescale for the D-A biphenyls. It is concluded that, in additon to the electronic interaction of 1ET with S0 and 1La, the electronic interaction with a close lying 1Lb state plays a fundamental role in the ET dynamics and the 1CT-S0 transition probability in D-A biaryls.

The initial photoinduced conformational relaxation occurs towards planarity in all biaryls investigated. However, various results evidence that the highly twisted D-A biphenyl additionally performs a slow "excited state intramolecular back twist rotation" leading to a solvent polarity dependent conformational equilibrium between a more planar (CT) and a more twisted (CTR) conformer in S1(1CT). Using global analysis of the biexponential fluorescence decays as a function of temperature and pressure in medium polar solvents, the kinetics, thermodynamics, viscosity control and decomposed emission spectra associated with this adiabatic photoreaction are determined.

The twist angle dependent ability of the D-A biphenyls to serve as fluorescent probes of micropolarity, changes of microviscosity or matrix order, protic solvents and pH is investigated. In particular, fluorescence sensing of pH seems to be promising.




Paperback Edition
Paperback
225 pages
$25.95
Choose vendor to order paperback edition
BrownWalker Press Amazon.com Barnes & Noble Harvard Book Store Return policy
PDF eBook
Sample Preview
Size 150k
Free
Download a sample of the first 25 pages
Download Preview

Entire PDF eBook
2001k
$17
Get instant access to an entire eBook
Buy PDF Password Download Complete PDF
eBook editions
Share this book



Relevant events
FEB
27
CRYMC25
2025 Central Region Younger Member Council (CRYMC) A major event for civil engineers, featuring technical sessions, workshops, and networking op...
27 - 01 Mar 2025
Online Event | United States
MAR
23
ACS2024
ACS American Chemical Society Spring 2025 ACS Spring 2025 Pushing Boundaries. Solving global challenges ACS Meetings & Expositions ...
23 - 27 Mar 2025
Online Event | United States
MAY
13
H2EF2025
Hydrogen Economy Forum (H2EF) 2025 The Hydrogen Economy Forum (H2EF) 2025, powered by APGH, is a landmark hydrogen forum designe...
13 - 14 May 2025
Kuching, Malaysia
JUN
23
SOFE2025
Symposium on Fusion Engineering 2025 Hosted by the MIT Plasma Science & Fusion Center at MIT's campus in Cambridge, MA We at th...
23 - 26 Jun 2025
Cambridge, United States
JUN
23
MATCON-2025
2th World Congress on Materials Science and Engineering (MATCON-2025) Welcome to the 12th World Congress on Materials Science and Engineering..! MATCON-2025 Hea...
23 - 24 Jun 2025
Barcelona, Spain
AUG
18
CASE 2025
2025 IEEE 21st International Conference on Automation Science and Engineering About CASE 2025 The IEEE International Conference on Automation Science and Engineering (CAS...
18 - 21 Aug 2025
Los Angeles, United States
SEP
15
2nd World Summit and Expo on Mechanical and Aerospace Engineering (WSEMAE2025), The objective of WSEMAE2025 is to provide a unique forum for discussion of the latest develop...
15 - 17 Sep 2025
Valencia , Spain
SEP
18
RCCECONF
3rd Global Conference on Research in Chemistry and Chemical Engineering We are excited to invite you to the 3rd Global Conference on Research in Chemistry and Chemic...
18 - 20 Sep 2025
Prague, Czech Republic
NOV
16
IMECE25
International Mechanical Engineering Congress & Exposition (IMECE) A leading conference for mechanical engineers, covering a wide range of topics in the field. ...
16 - 20 Nov 2025
Online Event | United States
DEC
15
AGU25
American Geophysical Union (AGU) Fall Meeting The submission period for session, town hall and workshop proposals for AGU25 will open March...
15 - 19 Dec 2025
New Orleans, United States