Fluorescence lifetime imaging grant success

We have been successful in our bid for a seed-corn grant from the Bristol Centre for Agricultural Innovation to investigate the fluorescence lifetimes of iridescent chloroplasts using fluorescence lifetime imaging. This will help upgrade our current time-correlated single photon counting apparatus and enable confocal imaging of single chloroplasts. These studies will investigate if the non-photochemical quenching response of the iridoplasts is related to their photonic structure.

Welcome Daniel Polak

download-1Dr Daniel Polak joins the Oliver group following PhD studies with Dr Jenny Clark at the University of Sheffield. In his PhD, Daniel studied singlet fission of polyenes inside de novo maquette proteins and the effect of microcavities on the emission efficiency of singlet fission. Daniel will use multidimensional optical spectroscopies to explore chemical and biomolecular condensed phase dynamics.

Giordano’s bimolecular excited state proton transfer accepted in JPCB

TOC1Giordano’s study of an biomimetic excited state proton transfer (ESPT) reaction “Following Bimolecular Excited State Proton Transfer between Hydroxycoumarin and Imidazole Derivatives” has been accepted for publication in the Journal of Physical Chemistry B. The paper details the immediate ESPT dynamics across a hydrogen bonded bridge between coumarin photoacid and imidazole base molecules in chloroform solution. Due to the short excited state lifetime of the photoacid, the immediate ‘contact’ ESPT reaction can be studied in isolation of diffusive driven ESPT dynamics. The paper is available online here and forms Tom’s contribution to the Journal of Physical Chemistry’s Young Scientists Virtual Special Issue.

Marta’s dinucleotide paper accepted!

TOCMarta’s paper entitled, Exploring ultraviolet photoinduced charge-transfer dynamics in a model dinucleotide of guanine and thymine, has been accepted for publication in Physical Chemistry Chemical Physics. The paper, unequivocally demonstrates that the Franck-Condon excited states of the dinculeotide, d(GpT), are significantly delocalised across both nucleobases, and mediate d(G+pT) exciplex product formation on an ultrafast (< 350 fs) timescale. Theoretical studies show that the nature of the vertical excited states are very dependent on the specific geometry of the dinucleotide, and dictate the degree of delocalised, charge-transfer or localised character. The paper is available to read here.