Twisting dynamics in the excited singlet state of Michler's ketone

The Journal of Physical Chemistry. a
Jahur A MondalDipak K Palit

Abstract

Ultrafast relaxation dynamics of the excited singlet (S(1)) state of Michler's ketone (MK) has been investigated in different kinds of solvents using a time-resolved absorption spectroscopic technique with 120 fs time resolution. This technique reveals that conversion of the locally excited (LE) state to the twisted intramolecular charge transfer (TICT) state because of twisting of the N,N-dimethylanilino groups with respect to the central carbonyl group is the major relaxation process responsible for the multi-exponential and probe-wavelength-dependent transient absorption dynamics of the S1 state of MK, but solvation dynamics does not have a significant role in this process. Theoretical optimization of the ground-state geometry of MK shows that the dimethylanilino groups attached to the central carbonyl group are at a dihedral angle of about 51 degrees with respect to each other because of steric interaction between the phenyl rings. Following photoexcitation of MK to its S1 state, two kinds of twisting motions have been resolved. Immediately after photoexcitation, an ultrafast "anti-twisting" motion of the dimethylanilino groups brings back the pretwisted molecule to a near-planar geometry with high mesomeric interaction and...Continue Reading

Citations

Oct 20, 2015·The Journal of Physical Chemistry. a·Rajib Ghosh, Dipak K Palit
Jun 28, 2016·ACS Applied Materials & Interfaces·Jingwei Sun, Ziqi Liang
Feb 26, 2016·Physical Chemistry Chemical Physics : PCCP·Rajib GhoshDipak K Palit
Oct 13, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Mahendra VarneDipak K Palit
Feb 3, 2012·Physical Chemistry Chemical Physics : PCCP·Francis A S ChipemG Krishnamoorthy
Oct 10, 2014·Photochemistry and Photobiology·Almaz S JalilovFrederick D Lewis
Aug 22, 2012·Physical Chemistry Chemical Physics : PCCP·Jahur A MondalDipak K Palit
Mar 19, 2013·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Rajib Ghosh, Dipak K Palit
Nov 3, 2006·The Journal of Physical Chemistry. a·Jahur A MondalDipak K Palit
Jan 23, 2009·The Journal of Physical Chemistry. a·Kuan-Lin LiuTien-Yau Luh
Apr 14, 2021·Nano Letters·Zhongwei ManHongbing Fu

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