@article{67327,
  abstract     = {{We report the synthesis, structural elucidation, and establishment of structure−property relationships for two metal−organic frameworks (MOFs), [M(OH)(H2BPD)]·xH2O (M = Al3+, Ga3+, x = 11–13), denoted as M-CAU-67, employing the ditopic linker molecule N,N′-4,4′ bipiperidine bis(methylenephosphonic acid) (H4BPD). The title compounds can be synthesized on a milligram scale under hydrothermal conditions, while gram-scale synthesis was realized under reflux conditions. Single-crystal X-ray diffraction (SCXRD) revealed an isoreticular, expanded MIL-91 type structure, representing a rare case of isoreticular expansion in porous metal phosphonates. The framework structure was confirmed by Rietveld refinement against powder X-ray diffraction (PXRD) data and further validated by solid-state NMR spectroscopy (31P MAS, 27Al 3Q MAS). Solvent-exchange experiments and variable-humidity/temperature PXRD data revealed high framework flexibility. The compounds show permanent microporosity and a complex, polarity- and size-dependent sorption behavior toward gases and vapors.}},
  author       = {{Theissen, Jennifer and Radke, Marvin and Mangelsen, Sebastian and Derveaux, Elien and Narváez Adams, Roberth Mateo and Wagner, Tobias and Lopau, Jasper and Näther, Christian and Nelle, Christian and Struve, Jörn and Steinke, Felix and Gándara Loe, Jesús and Gys, Nick and Hauffman, Tom and Tiemann, Michael and Tielens, Frederik and Adriaensens, Peter and Henke, Sebastian and Marchal, Wouter and Ameloot, Rob and Stock, Norbert}},
  issn         = {{0897-4756}},
  journal      = {{Chemistry of Materials}},
  number       = {{16}},
  pages        = {{8463--8475}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Isoreticular Expansion in Porous Aluminum(III) andGallium(III) Phosphonates: Synthesis, Structure, and Properties}}},
  doi          = {{10.1021/acs.chemmater.6c01336}},
  volume       = {{38}},
  year         = {{2026}},
}