Investigation of intermolecular interactions between [Ho(H2O)8]4+ based 3D metal-organic supramolecular host and bipyridyl guest through crystal structure and Hirshfeld surface analysis

A new supramolecular metal-organic complex 1, [{Ho(H2O)(8)}(4+)(TBTA)(bipy)] (where H(2)TBTA = tetrabromoterephthalic acid and bipy = 4,4'-bipyridyl), has been synthesized hydrothermally at 100 degrees C by mixing the reactants in stoichiometric ratio. The complex was characterized by single crystal X-ray diffraction (SC-XRD) along with powder X-ray diffraction (PXRD) and other spectroscopic analyses. Structural analysis reveals that 1 crystallized in the tetragonal space group I4cm and is a mononuclear complex. Ho4+ presents octa-coordinated square antiprism geometry having eight coordinated water molecules. Hydrogen bonding interactions between the coordinated water molecules and carboxylate oxygen atoms of TBTA (doubly deprotonated form of H(2)TBTA) anions form 3D supramolecular metal-organic host (MOSH) having 2D square grid-like supramolecular channels. Guest bipy molecules get stability within the channels through supramolecular pi center dot center dot center dot pi interactions between the bipy and TBTA anions. Hirshfeld surface analysis and corresponding 2D fingerprint plots correlate with the experimental findings. C center dot center dot center dot C short contact, corresponding to pi center dot center dot center dot pi interactions, contributes around 10.7% to the total surface.

Automated summary

A new supramolecular metal-organic complex 1 has been synthesized hydrothermally, featuring a mononuclear structure with octa-coordinated square antiprism geometry. The complex includes 2D square grid-like supramolecular channels formed by hydrogen bonding interactions and pi center dot center dot center dot pi interactions between the guest bipy molecules and TBTA anions, providing stability. Analysis shows that C center dot center dot center dot C short contact, corresponding to pi center dot center dot center dot pi interactions, contributes around 10.7% to the total surface.