Isostructural Family of Rare‐Earth MOFs Synthesized from 1,1,2,2‐Tetrakis(4‐phosphonophenyl)ethylene

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Abstract
The tetraphosphonic acid 1,1,2,2‐tetrakis(4‐phosphonophenyl)ethylene (H8L) was used as linker in the synthesis of eight new isostructural, phosphonate‐based metal‐organic frameworks of composition [M2(H2O)2(H2L)] ⋅ xH2O (M=Y3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Yb3+, Lu3+; 1.5<xM‐CAU‐34. The compounds were synthesized under hydrothermal reaction conditions, using the corresponding metal nitrates as starting materials. The determination of the crystal structure was achieved by a combination of electron and powder X‐ray diffraction (PXRD) data. In addition, a thorough characterization by thermogravimetric and elemental analysis, IR‐ and Raman‐spectroscopy as well as H2O‐sorption is given.

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