1 Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street W., Montreal, QC, H4B 1R6, Canada. ashlee.howarth@concordia.ca.
2 Photo Science - Structural Dynamics in Chemical Systems, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, Hamburg, 22607, Germany.
3 Department of Chemistry, McGill University, 801 Sherbrooke Street W., Montreal, QC, H3A 0B8, Canada.

Y-CU-45, an analogue of Zr-MOF-808, is synthesized for the first time. Several reaction conditions are tested demonstrating that two fluorinated modulators are required for a reproducible synthesis yielding high quality material. Y-CU-45 shows high crystallinity and surface area, shining light on the potential for rare-earth cluster-based MOFs with open metal sites.