@article{ranasinghe_hager_gorman_goodson_2004, title={Time-resolved fluorescence investigation of energy transfer in compact phenylacetylene dendrimers}, volume={108}, ISSN={["1520-5207"]}, DOI={10.1021/jp036877c}, abstractNote={Excitation energy transfer dynamics in light-harvesting dendritic macromolecules has generated a great deal of interest due to the fact that such systems can be used in photovoltaic and light-emitting devices. Studies on phenylacetylene-based dendrimers played a key role in stimulating this interest and extensive theoretical as well as experimental investigations have been carried out to get a better insight into the phenomena behind the excitation energy transfer dynamics of these dendrimers. In this manuscript, time-resolved femtosecond fluorescence and fluorescence anisotropy dynamics as well as temperature dependent steady state spectral studies of a second generation homogeneous (compact) phenylacetylene dendrimer are reported. The low-temperature fluorescence spectrum of the dendrimer showed two distinctive emission peaks that can be related to the existence of two closely spaced electronic states of the chromophore. Time-resolved fluorescence results suggest delocalization of the excitation energy ...}, number={25}, journal={JOURNAL OF PHYSICAL CHEMISTRY B}, author={Ranasinghe, MI and Hager, MW and Gorman, CB and Goodson, T}, year={2004}, month={Jun}, pages={8543–8549} }
 @article{gorman_smith_hager_parkhurst_sierzputowska-gracz_haney_1999, title={Molecular structure-property relationships for electron-transfer rate attenuation in redox-active core dendrimers}, volume={121}, ISSN={["1520-5126"]}, DOI={10.1021/ja990875h}, abstractNote={Two series of redox-active, iron−sulfur core dendrimers of the general structure (nBu4N)2[Fe4S4(S-Dend)4] (Dend = dendrons of generations 1 through 4) were prepared. Heterogeneous electron-transfer rate constants indicated that the rigid series of dendrimers were more effective at attenuating the rate of electron transfer than were the flexible series of dendrimers. These results were rationalized using computationally derived models which indicated an offset and mobile iron−sulfur core in the flexible series of molecules and a more central and relatively immobile iron−sulfur core in the rigid series of molecules. Further consideration of these data indicated that, while the dendrimers containing rigid ligands had better encapsulated redox cores for a given molecular weight, these molecules had higher electron-transfer rates for a given molecular radius.}, number={43}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Gorman, CB and Smith, JC and Hager, MW and Parkhurst, BL and Sierzputowska-Gracz, H and Haney, CA}, year={1999}, month={Nov}, pages={9958–9966} }
 @article{gorman_hager_parkhurst_smith_1998, title={Use of a paramagnetic core to affect longitudinal nuclear relaxation in dendrimers - A tool for probing dendrimer conformation}, volume={31}, ISSN={["0024-9297"]}, DOI={10.1021/ma9714979}, abstractNote={The longitudinal relaxation time constants (T 1 ) of the protons in a series of dendrimers that alternatively had paramagnetic ([Fe 4 S 4 (SR) 4 ] 2- , R = dendron) and diamagnetic (tetraphenylmethane) cores were compared. The T 1 values of the phenyl and benzyl protons in the paramagnetic core dendrimers were attenuated compared to those of analogous protons in the diamagnetic core dendrimers. This observation indicated that protons in each set of topologically different repeat units (generation) of the dendrimer approach the core of the molecule closely in space. This conclusion is consistent with the computed radial density distributions of the different generations calculated from molecular dynamics simulations. In addition, by comparing T 1 values of protons at two slightly different temperatures, the terminal groups in both sets of dendrimers were concluded to be, on average, more mobile than the other generations within the dendrimers. This conclusion is consistent with the computed mean square displacement correlation functions for the different generations also calculated from molecular dynamics simulations.}, number={3}, journal={MACROMOLECULES}, author={Gorman, CB and Hager, MW and Parkhurst, BL and Smith, JC}, year={1998}, month={Feb}, pages={815–822} }