Paper published

25/02/2022

M. Forjan and S. Vdović, in collaboration with the scientists from Institute Ruđer Bošković,  Politecnico di Milano and University of Bern have published a paper about photogeneration of quinone methide from adamantylphenol in an ultrafast non-adiabatic dehydration reaction. Scientific paper was published in Physical Chemistry Chemical Physics (PCCP).

 

Photogeneration of quinone methide from adamantylphenol in an ultrafast non-adiabatic dehydration reaction.

DOI: 10.1039/D1CP05690E

 

The ultrafast photochemical reaction of quinone methide (QM) formation from adamantylphenol was monitored in real time using femtosecond transient absorption spectroscopy and fluorescence upconversion in solution at room temperature. Experiments were complemented by theoretical studies simulating the reaction pathway and elucidating its mechanism. Excitation with sub-20 fs UV pulses and broadband probing revealed ultrafast formation of the long-lived QM intermediate directly in the ground state, occurring with a time constant of around 100 fs. UV-vis transient absorption data covering temporal dynamics from femtoseconds to hundreds of milliseconds revealed persistence of the absorption band assigned to QM and partially overlapped with other contributions tentatively assigned to triplet excited states of the adamantyl derivative and the phenoxyl radical that are clearly distinguished by their evolution on different time scales. Our data, together with the computations, provide evidence of a non-adiabatic photodehydration reaction, which leads to the formation of QM in the ground state via a conical intersection, circumventing the generation of a transient QM excited state.

V. Brusar defended his diploma thesis

28/09/2020

Vedran Brusar defended his diploma thesis “Transient absorption of Rhodamine B” where he used visible NOPA pulses for excitation and resulting transients for assessment of NOPA pulse duration.

Central European Conference on Photochemistry 2020

20/02/2020

Mateo Forjan participated in Central European Conference on Photochemistry 2020 held in Bad Hofgastein, Austria with the poster titled ”Ultrafast Transient Absorption of Phenolic and Adamantyl Compounds.

Laserlab Europe User Meeting

05/11/2019

M. Forjan participated in Laserlab Europe user meeting in Coimbra, Portugal with oral talk titled ”Ultrafast Transient Absorption of Phenolic and Adamantyl Compounds”.