README Explanatory notes for the datacat dataset for “High-throughput discovery of a rhombohedral twelve-connected zirconium-based metal-organic framework with ordered terephthalate and fumarate linkers”. This dataset contains raw experimental data. All files are text files which are delimited by tabs or spaces and therefore can be read into programmes such as Microsoft Excel or Origin or viewed as text files in any text editor. The relevant variables and units, where applicable, are provided as column headings for each data set. The experimental source of all data is explained in the supplementary information of the paper. Experimental Data: Powder X-ray diffraction (PXRD) data is provided for all samples synthesised in both of the batch syntheses in the chemical space defined by ZrOCl2, terephthalic acid, fumaric acid and formic acid. Batch 1 PXRD Data: AT025-1 - AT025-5.txt AT025-6 - AT025-10.txt AT025-11 - AT025-15.txt AT025-16 - AT025-20.txt AT025-21 - AT025-25.txt AT025-29 - AT025-30.txt AT025-31 - AT025-35.txt AT025-39 - AT025-40.txt Batch 2 PXRD Data: AT027-1 - AT027-9.txt AT027-10 - AT027-18.txt AT027-20 - AT027-24.txt AT027-28 - AT027-36.txt AT027-28 - AT027-42.txt AT027-46 - AT027-54.txt PXRD data collected at Beamline I11, Diamond is also provided for the sample which exhibited the Zr6(BDC)3(Fum)3 phase purely. AT027-23 I11 Data.txt Experimental data for the N2 adsorption isotherm recorded and thermogravimetric analysis is also given. N2 Isotherm.txt TGA Data.txt