Isoreticular Chemistry of Group 13 Metal-Organic Framework Compounds Based on V-Shaped Linker Molecules: Exceptions to the Rule?

Following the concept of isoreticular chemistry, we carried out a systematic study on Ga-containing metal-organic frameworks (MOFs) using six V-shaped linker molecules of differing sizes, geometries, and additional functional groups. The linkers included three isophthalic acid derivatives (-HBDC-R, R = CH, OCH, NHCOCH), thiophene-2,5-dicarboxylic acid (HTDC), and two 4,4'-sulfonyldibenzoic acid derivatives (HSDBA, DPSTA). The crystal structures of seven compounds were elucidated by a combination of model building, single-crystal X-ray diffraction (SCXRD), three-dimensional electron diffraction (3D ED), and Rietveld refinements against powder X-ray diffraction (PXRD) data.

Metal-Dependent and Selective Crystallization of CAU-10 and MIL-53 Frameworks through Linker Nitration.

The reaction of the V-shaped linker molecule 5-hydroxyisophthalic acid (H L ), with Al or Ga nitrate under almost identical reaction conditions leads to the nitration of the linker and subsequent formation of metal-organic frameworks (MOFs) with CAU-10 or MIL-53 type structure of composition [Al(OH)(L)], denoted as Al-CAU-10-L or [Ga(OH)(L)], denoted as Ga-MIL-53-L . The Al-MOF contains the original linker L as well as three different nitration products (L , L and L ), whereas the Ga-MOF mainly incorporates the linker L . The compositions were deduced by H NMR spectroscopy and confirmed by Rietveld refinement.

A Scandium MOF with an Unprecedented Inorganic Building Unit, Delimiting the Micropore Windows.

A new scandium metal-organic framework (Sc-MOF) with the composition of [Sc(OH)(OBA)], denoted as Sc-CAU-21, was prepared under solvothermal reaction conditions using 4,4'-oxidibenzoic acid (HOBA) as the ligand. Single-crystal structure determination revealed the presence of the new inorganic building unit (IBU) {Sc(μ-OH)(OC)}. It is composed of cis-connected ScO polyhedra forming an eight-membered ring through bridging μ-OH groups.

Influence of the substitution pattern of four naphthalenedicarboxylic acids on the structures and properties of group 13 metal-organic frameworks and coordination polymers.

Metal-organic frameworks containing Ga3+ ions and four differently substituted naphthalenedicarboxylates (ndc2-) have been synthesized and characterized. The Ga3+ ions are six-fold coordinated by oxygen atoms in all title compounds, but two different inorganic building units, i.e.