Study of efficient energy transfer depending on Zn-porphyrin compound ratio in pyrene based metal-organic frameworks by time-resolved spectroscopy

Metal–organic frameworks (MOFs) represent a class of solid-state hybrid compounds consisting of multitopic organic struts and metal-based nodes which are interconnected by coordination bonds.[1] Due to high porosity,... [ view full abstract ]

Metal–organic frameworks (MOFs) represent a class of solid-state hybrid compounds consisting of multitopic organic struts and metal-based nodes which are interconnected by coordination bonds.[1] Due to high porosity, chemical diversity and large surface areas,[2] MOF was studied for a broad range of potential applications including gas storage, catalysis, sensing, and light harvesting. NU-1000 is a Zr₆ based MOF structure which are well crystallized by pyrene ligands.[3] We studied energy transfer of new type of Zr based MOFs that replaced pyrene ligand to Zn-porphyrine ligand in NU-1000 by mixed ligand incorporation approach. The energy transfer between pyrene to Zn-porphyrin has been studied by confocal time-resolved photoluminescence spectroscopy. We found that Incorporation ratio of Zn-porphyrine in NU-1000 structure affects to energy transfer from pyrene to Zn-porphyrine. Pyrene emission peak was quenched while Zn-porphyrine enhanced, thereby increasing incorporation ratio of Zn-porphyrine. Also time-resolved photoluminescence results shows decay life time of pyrene is decreased while Zn-porphyrine is increased.

REFERENCES

[1] Planas, N., J. E. Mondloch, S. Tussupbayev, J. Borycz, L. Gagliardi, J. T. Hupp, O. K. Farha and C. J. Cramer. “Defining the Proton Topology of the Zr6-Based Metal-Organic Framework NU-1000,” J. Phys. Chem. Lett. Vol. 5, NO. 21, 3716−3723, 2014.

[2] Deria, P., J. E. Mondloch, E. Tylianakis, P. Ghosh, W. Bury, R. Q. Snurr, J. T. Hupp and O. K. Farha. “Perfluoroalkane Functionalization of NU-1000 via Solvent-Assisted Ligand Incorporation: Synthesis and CO₂ Adsorption Studies,” J. Am. Chem. Soc. Vol. 135, No. 45, 16801−16804, 2013.

[3] Deria, P., W. Bury, J. T. Hupp and O. K. Farha. “Versatile functionalization of the NU-1000 platform by solvent-assisted ligand incorporation,” Chem. Commun., Vol. 50, No.16, 1965-1968, 2014.