10.1021/cg801026y.s001
Lu Feng
Lu
Feng
Zhenxia Chen
Zhenxia
Chen
Tengbiao Liao
Tengbiao
Liao
Peng Li
Peng
Li
Yu Jia
Yu
Jia
Xiaofeng Liu
Xiaofeng
Liu
Yongtai Yang
Yongtai
Yang
Yaming Zhou
Yaming
Zhou
Supramolecular Isomerism of Metal−Organic Frameworks Derived from a Bicarboxylate Linker with Two Distinct Binding Motifs
American Chemical Society
2009
carboxylate groups
framework
interpenetrating
Bicarboxylate Linker
biphenyl connectors
Supramolecular Isomerism
coordination geometry
Cu
MOF
NbO topology
building units
SBU
tetrahedral configuration
diamond topology
arrangement
ligand acts
2009-03-04 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Supramolecular_Isomerism_of_Metal_Organic_Frameworks_Derived_from_a_Bicarboxylate_Linker_with_Two_Distinct_Binding_Motifs/2874151
Two novel metal−organic frameworks (MOFs), Cu(3,4′-bpdc)(H<sub>2</sub>O)·DMF·2H<sub>2</sub>O (<b>1</b>) and Cu(3,4′-bpdc)(H<sub>2</sub>O)·2DMF·4.5H<sub>2</sub>O (<b>2</b>), have been solvothermally synthesized by the reaction of a unsymmetrically substituted carboxylate ligand 3,4′-biphenyldicarboxylic acid (3,4′-bpdc) and Cu(NO<sub>3</sub>)<sub>2</sub>·2.5H<sub>2</sub>O. X-ray crystal structural analyses reveal that both MOFs possess the binuclear paddle-wheel units [Cu<sub>2</sub>(O<sub>2</sub>CR)<sub>4</sub>], which are linked by the biphenyl connectors, to give two different three-dimensional (3-D) frameworks. The structural diversities are due to the different coordinated arrangements of the two distinct carboxylate groups. In <b>1</b>, the noncentral symmetrical A−A−B−B arrangement leads to an uncommon twisted Cu-paddlewheel unit, which favors a tetrahedral configuration to generate a 3-fold interpenetrating 3-D framework with a diamond topology. In <b>2</b>, the paddle-wheel unit constructed by the central symmetrical A−B−A−B arrangement of the ligand acts as a square-planar 4-connected node to give a 2-fold interpenetrating 3-D framework with an NbO topology. These two polymorphs are very rare in MOFs that exhibit similar metal local coordination geometry and the same secondary building units (SBU) but different ligands linking modes. Furthermore, both <b>1</b> and <b>2</b> possess large one-dimensional channels and show the ability to adsorb H<sub>2</sub>.